Find every CalcBE tool grouped by category. Add calculators to your favourites so they surface on the home page.
New embed: Embed widget & share link builder produces prefilled share URLs, responsive iframe code, base64url cfg bundles, and auto-height snippets so you can embed CalcBE apps in LMS, blogs, or intranet portals.
Precision update: Significant Figures & Scientific Notation counts sig figs, normalizes scientific notation, and compares textbook versus final rounding rules with shareable How it’s calculated logs.
New optics: Lens & Mirror Equation walks through 1/f = 1/dₒ + 1/dᵢ with a live How it's calculated panel, ray diagram, CSV export, and shareable URLs for physics labs.
New electronics: RC / RL / RLC calculator tracks RC/RL time constants, divider gain, and series RLC resonance with full How it's calculated steps, CSV export, and shareable URLs.
New chemistry: Partial pressure & gas mixing documents Dalton's law, two-tank mixing, wet gas corrections, and van der Waals comparisons with CSV export and shareable URLs.
New chemistry: Buffer pH (Henderson–Hasselbalch) walks through mole conversions, r ratios, target pH design, strong acid/base additions, and buffer capacity β with shareable How it's calculated logs.
New worksheets: Worksheet & Quiz Auto-Generator outputs deterministic seeds, How it's calculated steps, CSV export, and print-ready PDFs for algebra classes.
Graph paper: Graph paper PDF generator builds millimeter-accurate Cartesian, polar, log-log, semilog, and isometric grids with How it’s generated steps, SVG/CSV export, and shareable URLs.
Number line: Number line & interval visualizer shades inequalities, interval unions, and intersections on an SVG number line, shows step-by-step reasoning, and offers SVG/PNG, CSV, and shareable URL exports.
Dimensional analysis: Dimensional analysis & unit consistency checker expands compound units, verifies equation consistency, and builds Buckingham Π groups with shareable How it’s calculated logs.
Latest physics: Simple Harmonic Motion (SHM) simulator unifies analytic, Euler-Cromer, and RK4 solutions with a How it's calculated log, shareable URLs, plots, and CSV exports for classroom use.
Latest addition: Error propagation (with steps) brings gradient×covariance, correlation matrices, templates, and seeded Monte Carlo validation together in one multilingual workspace.
New arrival: Sampling & Bootstrap — CLT Explorer brings seeded sampling, percentile/t/normal confidence intervals, CLT histograms, CSV export, and a full How it's calculated walkthrough to one shareable workspace.
Now available: Truth Table & Logic Evaluator builds paged truth tables, canonical DNF/CNF, and Karnaugh or Quine–McCluskey simplifications with shareable URLs, CSV export, and How it’s calculated logs.
Brand-new: Probability Simulator runs reproducible coin, weighted dice, and roulette experiments with theory vs empirical comparisons, Wilson 95% intervals, convergence charts, EV/house edge, CSV/LaTeX exports, and full How it's calculated steps.
Fresh release: CI & Hypothesis Test Wizard guides one- and two-sample mean or proportion analyses with Wilson/Newcombe intervals, live p-value shading, and shareable URLs.
New release: Riemann Sums Explorer plots left/right rectangles, trapezoids, and Simpson arcs, logs every step, compares an adaptive Simpson reference integral, and exports CSV, LaTeX, and shareable URLs.
Fresh drop: Distributions Pack Calculator brings binomial, Poisson, Student’s t, and chi-square together with PMF/PDF, CDF, quantiles, exact intervals, canvas visuals, CSV, LaTeX, and share links for class transparency.
New release: First-order ODEs (separable & linear) visualises the slope field, Simpson integrals, integrating factor, numeric inversion, RK4 error, CSV export, and shareable URLs in one workspace.
Check out the new Function Transformations Explorer to see how y = a·f(b(x−h)) + v shifts, scales, and reflects classic functions with step-by-step explanations.
New: Vector Calculator with step-by-step logs for dot/cross, projection, angle, areas, and the triple product, plus a 2D diagram.
Fresh release: Eigenvalues & Eigenvectors Explorer covering 2x2 and 3x3 matrices with rational-root checks, QR iteration, RREF eigenvectors, residuals, and a diagonalizability verdict.
We also launched the Limits Explorer to show numeric L'Hôpital iterations, one-sided sampling, and ready-to-share CSV logs.
Latest addition: Taylor & Maclaurin Series Explorer pairs symbolic derivatives with a least-squares fallback, plots f and P_n together, and exports error summaries, LaTeX, CSV, and shareable URLs.
New utilities: Random Number Generator, Text Case Converter, Image Resizer, Random Picker, Zenkaku / Hankaku Converter, and JSON Formatter & Validator all run entirely in the browser and are ready to embed.
Popular calculators
Quick links to commonly used calculators in English.
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- Free online tools – PDF, image, text, random | CalcBE
Browser-only tools for PDF tasks, images, text formatting, worksheets, and random generators. No sign-in; files stay local.
- Annotation paper PDF generator (comment margin) | CalcBE
Generate annotation paper with a wide comment margin in millimeters. Choose left/right/both comment columns, switch between ruled/dot/blank guides, and print or save to PDF. Export settings to CSV and share a URL to r…
- Password generator – strong secure random passwords | CalcBE
Generate strong random passwords in your browser with crypto.getRandomValues. Exclude ambiguous characters, meet rules, copy or download. Share settings only (no passwords in URLs).
- Acid–base pH calculator (strong & weak acids and bases) | CalcBE
Solve pH and pOH for strong and weak acids and bases and for strong acid–strong base mixtures, with clear steps and shareable URLs.
- Topic collections – loans, taxes, PDFs, random | CalcBE
Browse CalcBE topic collections to reach the right calculator or tool faster: random & probability, loans & mortgages, taxes, paper templates, and PDF tools.
- Base Converter & Bitwise Toolkit (Bin/Oct/Dec/Hex) | CalcBE
Convert between binary, octal, decimal, and hexadecimal, and run AND/OR/XOR/NOT and bit shifts—then copy a shareable result link.
- Calorimetry calculator (specific heat, heat, final temperature)
Free calorimetry calculator to find heat, specific heat, temperature change, and final equilibrium temperature when mixing two substances.
- Clock tools – timer, pomodoro, stopwatch | CalcBE
Browse clock tools like the online timer, pomodoro, and stopwatch. Analog + digital displays, fullscreen mode, and keyboard shortcuts included.
Recently used
Every calculator you open is remembered locally so you can jump back in quickly.
Finance & money
Plan loans, project compound growth, convert currencies, and split bills.
- Loan calculator – monthly payment, interest & payoff | CalcBE
Calculate monthly payment, total interest, and payoff time from principal, APR, and term for an amortized loan. Shareable URL — runs locally in your browser.
- Mortgage repayment planner – monthly payments, lump sums and refinance scenarios | CalcBE
Simulate mortgage repayments with equal payment or equal principal methods, include bonus payments, lump-sum prepayments, and compare refinance scenarios side by side.
- Compound Interest Calculator (Future Value & Effective Annual Rate) | CalcBE
Estimate future value and Effective Annual Rate from APR, compounding frequency, years, and optional monthly contributions. Copy a shareable result link.
- Discount calculator – stacked percentage, amount and coupon deals | CalcBE
Enter a list price and stack percentage cuts, fixed-amount deals and coupons to see final price and savings. Handy for checking sale deals.
- Retirement Savings Calculator (Contributions, Growth & Inflation) | CalcBE
Project your retirement nest egg by combining current savings, recurring monthly contributions, investment growth, and inflation assumptions.
- Fuel Economy, Gas Cost and Trip Cost Calculator | CalcBE
Estimate your real-world fuel economy, gas cost for a drive, and total trip cost including tolls and parking. Supports both metric and US units.
- APR to APY (EAR) Calculator — monthly and daily rates | CalcBE
Convert APR to APY/EAR and monthly or daily rates, or reverse the calculation to compare loans, credit cards, and savings. Includes presets and shareable URLs.
- Biweekly loan amortization schedule (CSV export) | CalcBE
Compute a biweekly amortization schedule (26 payments/year), include extra payments, and export the table to CSV.
- Break-even Point and Required Sales Calculator | CalcBE
Calculate the break-even point, required sales to reach a target profit, and profit at your planned sales volume. Simple break-even analysis for small businesses.
- Consumption Tax Calculator (10% / 8% with item breakdown) | CalcBE
Calculate Japanese consumption tax with standard 10%, reduced 8% or custom rates per item. Switch net↔gross prices, control rounding and share results.
- Credit card minimum payment simulator – payoff time & interest | CalcBE
Estimate months to payoff and total interest by entering balance, APR, and your card’s minimum payment policy (rate and/or fixed amount). Shareable URL included.
- Credit Card Payoff & Debt Snowball Calculator | CalcBE
Estimate payoff time, total interest, and compare debt snowball vs. avalanche for multiple credit cards using your balances, APRs, minimum payments, and monthly budget.
- Debt-to-income (DTI) ratio calculator | CalcBE
Enter monthly income and monthly debt payments to compute your DTI percentage and a quick category label. Shareable URL and copy results included.
- Deposit interest calculator: future value & EAR | CalcBE
Find future value, interest, and EAR from deposit amount, rate, years, and compounding choice. Instant browser results help you compare savings options.
- EMI calculator (loan EMI, monthly payment) | CalcBE
Calculate EMI (Equated Monthly Installment) from principal, annual interest rate, and term. See monthly payment, total paid and interest, with an easy shareable URL.
- Fixed Deposit (FD) Calculator
Compute maturity value, interest earned, and effective annual rate (EAR) from principal, annual rate, years, and compounding frequency. INR-friendly.
- GST Calculator (Add/Inclusive) | CalcBE
Enter amount and GST rate (5/12/18/28%) to compute base, GST amount, and total for both exclusive and inclusive cases. Shareable URL and copy results included.
- Income Tax Calculator India (FY example)
Estimate Indian income tax using example slabs for selected FYs (educational). Apply optional standard deduction, see taxable income, income tax, cess, and effective rate. Shareable URL included.
- Invoice net ↔ gross calculator – add or remove VAT on totals | CalcBE
Convert net ↔ gross invoice amounts with a VAT rate. Choose whether the entered amount is net or VAT-inclusive, pick the rate and rounding, and share results with a URL or CSV.
- Lira ↔ kurus converter – split Turkish currency into lira and kurus | CalcBE
Convert between Turkish lira and kurus with live calculations that respect 100 kurus = 1 lira. Enter either amount, see the breakdown instantly, and share your setup with a copyable URL.
- Live FX currency converter – ECB reference rates and open API | CalcBE
Convert currencies with live FX rates from ECB or Open ER API, view recent history, and share results. Offline cache and favorites supported.
- Loan affordability calculator – max payment (DTI) & loan amount | CalcBE
Estimate the maximum monthly payment (EMI) and loan amount from monthly income, EMI ratio (DTI), APR, and term. Shareable URL. Educational only.
- Loan amortization schedule (with CSV export) | CalcBE
Build an amortization schedule with principal, interest, and balance per payment. Model extra payments and export the table as CSV.
- Margin & markup calculator – profit margin, markup and selling price | CalcBE
Enter cost, price, margin %, or markup % and instantly solve the remaining fields. See margin on price and markup on cost with shareable results.
- Mortgage and Loan Repayment Burden Checker | CalcBE
Check your debt-to-income (DTI) ratio for a planned mortgage and other loans, and estimate how much you can safely borrow based on your income and target repayment burden.
- Net ↔ gross salary converter – illustrative tax and deduction breakdown | CalcBE
Quickly convert between gross and net salary using a simple example tax rate. Educational only—actual payroll rules vary.
- New NISA savings simulator – tax-free allowance vs taxable investments | CalcBE
Project your New NISA contributions versus a taxable account, track annual and lifetime allowance usage, and compare the after-tax difference with adjustable.
- PPF Calculator (Annual Contribution — Educational)
Estimate maturity, total invested, and gain from annual contribution, APR, and years with a simple annual-compounding model (educational). INR-friendly.
- Price, Cost, Margin and Markup Calculator | CalcBE
Quickly calculate profit margin, markup, selling price and cost per unit. Enter any combination of cost, price and target margin to see your profit and markup instantly.
- Recurring Deposit (RD) Calculator
Compute maturity amount, total invested, and estimated gain from monthly deposits, annual rate, and years. INR-friendly.
- Salary gross ↔ net educational estimator – taxes, deductions and take-home pay | CalcBE
Convert gross ↔ net salary using simple flat or example progressive rates. Educational estimator only, not a country-specific payroll calculator.
- Savings Goal & Monthly Contribution Calculator | CalcBE
Work out the monthly contribution to hit a savings goal, project how far your monthly deposits will grow, or estimate the time needed to reach your target with monthly compounding.
- Savings Goal Planner: Deposits, Time, Future Value | CalcBE
Work out the deposit needed to hit a savings target, the time required at a chosen deposit, or the future value of a plan using APR, EAR or continuous compounding. Educational only.
- Simple & Compound Interest, NPV & IRR Calculator | CalcBE
Compare simple and compound present/future values alongside cash-flow NPV and IRR. Model multiple discount-rate scenarios and share the results instantly.
- SIP Calculator (Investment)
Compute maturity amount, total invested, and estimated gain from monthly investment amount, expected annual return, and years. Shareable URL included.
- Split Bill Calculator (tax, weights, rounding, QR) | CalcBE
Split a bill with inclusive or exclusive tax, custom weights, representative adjustments, and share the result via URL or QR code.
- Tip & split calculator – restaurant tip, bill sharing and per-person amount | CalcBE
Enter the bill total and tip percentage to instantly see the tip amount, new total, and per-person share when splitting the bill.
- VAT / Sales Tax calculator – exclusive ↔ inclusive amounts with custom rates | CalcBE
Convert between net and gross amounts for VAT or sales tax. Enter a price, tax rate and direction to see tax, net and total at once, with flexible rounding rules.
- VAT net ↔ gross quick converter – add VAT to net or strip tax from totals | CalcBE
Quickly convert between VAT-exclusive (net) and VAT-inclusive (gross) prices at standard rates. Enter either net or gross and see all three: net, VAT, and gross.
Unit converters
Convert everyday units quickly for study, travel, and DIY projects.
- Universal Unit Converter for Length, Area, Volume & More | CalcBE
Convert length, area, volume, mass, speed and temperature units instantly. Pick a category, enter a value and read the full conversion table, then copy results or share a URL.
- Temperature Converter (Celsius, Fahrenheit, Kelvin) | CalcBE
Convert between Celsius (°C), Fahrenheit (°F), and Kelvin (K) with precise formulas, keyboard input, and a shareable result link.
- Length Converter (m, km, cm, mm, inch, foot, yard, mile) | CalcBE
Convert lengths across metric and imperial units at once with SI‑based factors, keyboard input, and a shareable result link.
- Currency converter – manual rates, base currency and quick totals | CalcBE
Convert currencies with manual rates or a base‑currency cross. Enter a direct quote or two‑step rate, swap currencies, and copy a shareable result.
Date & time
Track schedules, deadlines, and logs with dedicated date-time tools.
- Date Difference Calculator (days, business days, Y/M/D) | CalcBE
Compute days between dates, count business days and working hours, and see a year‑month‑day breakdown. Optionally include the start date and copy a shareable result URL.
- Business Days & Countdown Calculator | Skip Weekends | CalcBE
Count calendar or business days between two dates, exclude custom weekend patterns and holiday lists, and jump forward or backward by N business days. Copy a shareable URL for the full setup.
- Time zone converter – instant world clock with multiple cities and offsets | CalcBE
Enter a date and time to convert between time zones, with automatic daylight‑saving shifts, presets for major cities, and a shareable result link.
- Time duration adder & subtractor (HH:MM/HH:MM:SS) | CalcBE
Add or subtract multiple HH:MM or HH:MM:SS durations line by line and get a normalized total time. Supports leading +/-, negative totals, spans over 24 hours, and shareable result URLs—runs locally in your browser.
- Age Calculator from Date of Birth (Years, Months, Days) | CalcBE
Calculate your age from your date of birth: years, months, days, and days until your next birthday. Optional reference date and shareable result link.
- Speed–Distance–Time Calculator with Pace & ETA | CalcBE
Calculate speed, distance, or time from the other two. Includes unit conversions, pace output for running, and optional ETA from a start time.
- 12/24 Time Format Converter (AM/PM ↔ 24h) | CalcBE
Convert 12-hour AM/PM and 24-hour time formats instantly with copy buttons, shareable URLs, and batch conversion.
- Event Countdown (Time Remaining) | CalcBE
Show time remaining until a target date/time with an analog + digital display. Share settings by URL, embed via iframe, and switch local/UTC interpretation.
- ISO week number, quarter & fiscal year calculator | CalcBE
Get ISO week number, calendar/fiscal quarter, and fiscal year for any date. Customize week rules and fiscal year start month — no sign-in.
- Recurring counter: counts in range, next date, Nth | CalcBE
Count how many times a recurring event happens in a date range. Also find the Nth occurrence date or the next occurrence after a reference date.
- Time Zone Meeting Planner (Best Meeting Times) | CalcBE
Plan meeting times from participants' time zones and working hours with analog + digital clocks, top suggestions, and an availability matrix.
- World Clock Board (Multiple Time Zones) | CalcBE
Compare multiple city times with analog + digital clocks, work-hour highlights, shareable URLs, and JSON export/import.
Math & statistics
Solve common classroom and analytics problems without spreadsheets.
- 2D graphing calculator – plot and intersect functions | CalcBE
Plot up to three functions, find intercepts, intersections and extrema numerically, and explore the graph with zoom, pan, shareable URLs and clear step-by-step logs.
- Quadratic & polynomial equation solver – worked steps and graph insights | CalcBE
Solve quadratic and low-degree polynomial equations with exact and decimal roots, discriminant classification, factorization, completing the square and a graph, all with worked steps.
- Quadratic equation solver – roots, discriminant and vertex form | CalcBE
Solve ax² + bx + c = 0 and see real or complex roots, the discriminant, vertex form and a quick graph. Automatically switches to the linear case when a = 0.
- Percentage Calculator (X% of Y, increase/decrease) | CalcBE
Work out X% of Y, what percent one number is of another, and the new value after a percent increase or decrease. You can also copy a link to the result.
- Prime Factorization Calculator | Miller–Rabin & Pollard Rho | CalcBE
Factor integers fast with Miller–Rabin and Pollard Rho. See canonical form, steps, and arithmetic functions like τ(n), σ(n), φ(n), μ(n), rad(n).
- Probability Simulator — coin, dice, roulette (theory vs empirical, with steps) | CalcBE
Simulate coin tosses, dice rolls and roulette spins with a fixed seed to compare theoretical and empirical probabilities. Inspect confidence intervals, convergence charts and shareable runs.
- 2-column / 3-column notes (T-chart) PDF generator | CalcBE
Create 2- or 3-column note paper (T-chart) in millimeters. Adjust column ratios, headers, and ruled/dot guides, then print or save as PDF. Supports SVG, CSV, and shareable URLs.
- 2D geometry calculator – area & perimeter of shapes | CalcBE
Compute area and perimeter for rectangles, circles, triangles, trapezoids and regular polygons from side lengths, radii or heights, with formulas shown for homework and quick design checks.
- 3D Geometry Calculator (Sphere, Cylinder, Cone, Prism) | CalcBE
Compute volume and surface area for spheres, cylinders, cones, rectangular and regular prisms—with example inputs, step-by-step formulas, and a shareable result link.
- A260 concentration & purity calculator (A260/280, A260/230) | DNA/RNA | CalcBE
Calculate DNA/RNA concentration (ng/µL, µg/mL) and purity ratios (A260/280, A260/230) from A260/A280/A230 and dilution. Includes dsDNA/RNA factor presets, total amount from volume, optional blank correction, CSV/LaTeX…
- Acid-base titration curve and pH calculator
Free acid-base titration calculator for strong and weak acids and bases. Compute pH at any point and generate titration curves with step-by-step explanations.
- Acid–base pH calculator (strong & weak acids and bases) | CalcBE
Solve pH and pOH for strong and weak acids and bases and for strong acid–strong base mixtures, with clear steps and shareable URLs.
- Acid–base titration curve calculator – pH vs volume with worked steps | CalcBE
Plot strong and weak acid–base titration curves, highlight buffer regions and equivalence points, and review the Henderson–Hasselbalch or hydrolysis steps behind each segment.
- Algebra simplifier with colors for like terms | CalcBE
Expand with distribution, color-match like terms, and simplify step by step. See sign flips, teacher mode, shareable URL, LaTeX copy, and SVG export all in your browser.
- Annotation paper PDF generator (comment margin) | CalcBE
Generate annotation paper with a wide comment margin in millimeters. Choose left/right/both comment columns, switch between ruled/dot/blank guides, and print or save to PDF. Export settings to CSV and share a URL to r…
- Arithmetic & Geometric Sequence Calculator | CalcBE
Compute the nth term, partial sum, common difference or ratio, and number of terms for arithmetic and geometric sequences. Shows formulas, steps, term previews, and infinite geometric series when |r| < 1.
- Base Converter & Bitwise Toolkit (Bin/Oct/Dec/Hex) | CalcBE
Convert between binary, octal, decimal, and hexadecimal, and run AND/OR/XOR/NOT and bit shifts—then copy a shareable result link.
- Beer-Lambert law calculator and calibration curve (A = εlc)
Free online Beer-Lambert law calculator for absorbance, concentration, molar absorptivity, path length, and calibration curves. Great for general chemistry and lab reports.
- Bell numbers table with Stirling relations | CalcBE
Generate a Bell numbers table B(n) and confirm the relation B(n)=ΣS(n,k). Includes exact BigInt or modulo mode, CSV/TSV export, Stirling tabs, and shareable URLs.
- Beta Distribution Generator & Visualizer | CalcBE
Generate random samples from a Beta distribution and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
- Bingo card generator (printable) – 75/90 & custom | CalcBE
No install, free. Generate printable bingo cards in your browser (75/90 ball, range, or custom word bingo), shuffle a call list, then print or download.
- Birthday paradox (collision probability) calculator | CalcBE
Calculate the birthday paradox collision probability with exact math + a Monte Carlo simulator. Get P(collision), P(no collision), a Poisson approximation with error, and the required sample size n for a target probab…
- Buffer pH (Henderson–Hasselbalch) with steps — design, additions, capacity | CalcBE
Compute buffer pH with the Henderson–Hasselbalch equation, design mixtures for a target pH, and model strong acid/base additions with buffer capacity and step-by-step logs.
- Calligraphy guide sheet PDF generator | CalcBE
Adjust x-height/ascender/descender ratios, slant angle (52–55°), unit lines, vertical guides, and left margin lines for calligraphy practice. Presets for Copperplate/Spencerian/Italic, A4/B5/Letter/A3, SVG output, pri…
- Calorimetry calculator (specific heat, heat, final temperature)
Free calorimetry calculator to find heat, specific heat, temperature change, and final equilibrium temperature when mixing two substances.
- Card deck shuffler – shuffle & draw cards | CalcBE
Shuffle a deck of playing cards and draw or deal cards in your browser. Choose decks and jokers, then copy or download results. Share settings only (no history in URLs by default).
- Catalan number explorer - Dyck paths & trees | CalcBE
Explore Catalan numbers C_n with exact BigInt or modulo tables, then enumerate or uniformly sample Dyck words, Dyck paths, and full binary trees. Export CSV or share URLs with seeds for reproducible examples.
- Catalyst loading calculator – mol%, ppm, eq to mass/volume | CalcBE
Convert catalyst loading between eq, mol% and ppm/ppb, calculate required mass or volume from a base amount, and share the setup by URL.
- Cell seeding calculator | cells/well → required volume | CalcBE
Calculate required cell suspension and media volume from target cells/well (or cells/cm²), number of wells, volume, and stock concentration. Includes per-well volume, overage, viability correction, copy, CSV/LaTeX, an…
- CFU/mL calculator (dilution, plated volume) | from colony counts | CalcBE
Calculate CFU/mL from dilution (e.g., 10^-6), plated volume (mL), and colony counts. Supports auto selection by guide range (30–300), manual selection, per-dilution summary, plots, logs, CSV/LaTeX, and share URLs.
- Chemical Equation Balancer + Stoichiometry (with steps) | CalcBE
Chemical equation balancer with Gauss-Jordan steps. Compute limiting reagent, theoretical/percent yield, and balance redox half-reactions with shareable outputs.
- Chemical equilibrium ICE table calculator (Kc, Kp)
Calculate equilibrium concentrations and a full ICE table from Kc or Kp and initial conditions for a single chemical reaction. Useful for general chemistry and lab reports.
- Chinese character grid (Tianzige / Mizhige) PDF generator | CalcBE
Generate Tianzige/Mizhige practice grids in millimeters. Adjust rows, columns, cell size, bold lines every 5 cells, line colors, and header/footer for A4/B5/Letter. Includes no-guide and scan-friendly presets. Print a…
- CI & Hypothesis Test Wizard (Means & Proportions) | CalcBE
Build confidence intervals and hypothesis tests for means and proportions. Supports Welch, paired, Wilson, Newcombe, and visualises p-values.
- Circular & necklace permutation calculator | CalcBE
Compute circular permutations (rotation counted as the same) and necklace/bracelet permutations (rotation + reflection counted as the same) from n. Shows exact values, digit count, formula, short steps, and a shareabl…
- Circular motion & centripetal force calculator
Free circular motion calculator for centripetal acceleration, centripetal force, angular speed, period, frequency, and ideal banked-curve angle.
- Clock tools – timer, pomodoro, stopwatch | CalcBE
Browse clock tools like the online timer, pomodoro, and stopwatch. Analog + digital displays, fullscreen mode, and keyboard shortcuts included.
- Colligative properties calculator — boiling, freezing, osmotic | CalcBE
Calculate boiling-point elevation, freezing-point depression, osmotic pressure, and molar mass from colligative measurements.
- Compare PDFs by text – browser-only diff tool for document revisions | CalcBE
Upload two PDFs, extract their text locally, and highlight differences by line or paragraph. No uploads—diff stays in your browser.
- Complex Number Calculator — a+bi ↔ polar with steps | CalcBE
Convert between a+bi and r∠θ, perform complex addition, subtraction, multiplication, division, powers, and list n-th roots with a live Argand plot and step-by-step breakdown.
- Concentration & pH calculator – step-by-step chemistry working | CalcBE
Calculate molarity, mass percent, M1V1 dilution, mixing, w/w→M, and strong or weak acid-base pH with 25 °C assumptions and a detailed step-by-step breakdown.
- Concrete, Gravel & Mulch Calculator | Material Estimates | CalcBE
Estimate concrete volume and bag counts, gravel coverage and tons, and mulch bags with US or metric inputs plus a waste allowance. Results are informational only.
- Conic sections calculator – standard form & focus | CalcBE
Classify a general quadratic, rotate to eliminate xy, complete the square to standard form, and visualize focus, directrix, and asymptotes. LaTeX/URL/CSV ready.
- Coordinate geometry calculator – distance & lines | CalcBE
Compute distance, midpoint, slope, line equations, circles, and intersections with full working shown beside the results and a live coordinate plane diagram.
- Cornell notes PDF generator – cue/notes/summary layout | CalcBE
Generate Cornell notes paper as SVG in millimeters. Adjust cue/notes/summary/header sizes, choose ruled/dot/blank guides, then print or save to PDF. Export settings to CSV and share a URL to reproduce the layout.
- Coupon collector problem calculator – expected draws & t99 | CalcBE
Solve the coupon collector problem: expected draws (n·H_n), completion probabilities P(T≤t), and t50/t90/t99. Supports weighted rarities and reproducible simulation.
- Crop & resize PDF pages – adjust size, margins and orientation in your browser | CalcBE
Crop and resize PDF pages in your browser. Draw a crop area, pick a target size (A4, Letter, or custom), add margins, and export—no uploads.
- Data Size, Transfer Speed & Time Calculator | CalcBE
Calculate transfer time, required speed, or transferable data size. Clear bits vs bytes and SI vs IEC units, plus an optional efficiency factor.
- Deck & Terrace Paint Area Calculator | Gallons & Liters | CalcBE
Estimate deck and terrace paintable area plus primer/topcoat gallons or liters from one rectangle, multiple zones, or a known area. Switch ft/m, include gaps and edges, add railing, set coats, waste, and coverage over…
- Descriptive Statistics + Box Plot & Histogram (with steps) | CalcBE
Paste a dataset or upload CSV/TSV to review descriptive statistics, histogram, box plot, outlier counts, trimmed mean, CSV export, LaTeX summary, and documented steps.
- Dice roller (d4–d100) with PNG sharing | CalcBE
Roll d4–d100 with quick buttons or 2d6+3 notation. Totals, breakdowns, local history, and share as text or PNG — no sign-in.
- Dice stats (odds & distribution) + PNG sharing | CalcBE
Compute odds and distributions for NdS +/- K. Auto switches Exact/Sim, shows a histogram, and lets you share as text, PNG, or URL — in your browser.
- Dice tools – roller, TRPG checks, dice stats | CalcBE
Browser-only dice tools: dice roller, TRPG checks, and dice stats for odds and distributions.
- Differentiation Calculator (steps, tangents, numeric) | CalcBE
Compute symbolic and numeric derivatives for single-variable, parametric, implicit, and partial derivatives. See Richardson extrapolation steps and tangent lines instantly for teaching and study.
- Dimensional analysis & unit consistency checker (with steps) | CalcBE
Parse compound units, verify equation consistency, and generate Buckingham Π groups with step-by-step logs, CSV export, and shareable URLs.
- Dirichlet Distribution Generator & Visualizer (probability vectors) | CalcBE
Generate probability vectors from a Dirichlet distribution and visualize marginals and simplex plots. Runs locally — no uploads; share settings-only URLs.
- Distance modulus calculator — m−M = 5 log10(d/10 pc) | CalcBE
Distance modulus formula: m−M = 5 log10(d/10 pc). Compute distance, apparent magnitude, or absolute magnitude, plus a simple 1/r² brightness graph.
- Distribution calculator – binomial, Poisson, t, chi-square | CalcBE
Compute PMF/PDF, CDF, quantiles, and exact confidence intervals for binomial, Poisson, Student's t, and chi-square distributions with step-by-step explanations, graphs, CSV, LaTeX, and shareable URLs.
- Distribution sampler – random samples & histograms (normal, Poisson) | CalcBE
Generate random samples from common distributions (normal, log-normal, gamma, poisson, and more). Visualize histograms, check summary stats, and download CSV/JSON — runs locally in your browser.
- Diversity index calculator (Shannon & Simpson) | ecology & microbiome | CalcBE
Calculate diversity indices from category counts. Shows Shannon (ln/log2/log10) and Simpson (D, 1−D, 1/D) together, plus Hill numbers (q=0/1/2) and evenness (Pielou J). Supports examples, paste input, copy results, CS…
- DNA assembly mix calculator (Gibson/Golden Gate) | Auto mix volumes | CalcBE
Calculate DNA assembly mix for Gibson or Golden Gate. From backbone/insert molar ratios, get required mass (ng) and volume (µL), plus remaining water for total reaction volume. Examples, table input, copy, CSV/JSON, s…
- DNA/RNA converter (ng/µL ↔ nM ↔ copies) | by length | CalcBE
Convert between mass concentration (ng/µL), molar concentration (nM), and copy number (copies/µL) from DNA/RNA length and type. Shows approximate molecular weight, total amount from volume, CSV/LaTeX, and share URLs.
- Dot grid paper PDF generator – printable SVG in mm | CalcBE
Generate dot grid paper as an SVG in millimeters. Adjust dot spacing, dot size, opacity, margins, calibration box, and guide markers. Print or save to PDF, export settings to CSV, and share a URL to reproduce the layout.
- Earthquake magnitude & energy comparison calculator | CalcBE
Compare two earthquake magnitudes and compute the energy ratio using E2/E1 = 10^{1.5(M2 - M1)}, with intuitive explanations and a log-scale bar view.
- Eigenvalues & Eigenvectors (2x2, 3x3) — with steps | CalcBE
Compute eigenvalues, eigenvectors, residuals, and multiplicities for 2x2 and 3x3 matrices with analytic, rational-root, and QR iteration explanations.
- Electrochemical cell & Nernst equation calculator | CalcBE
Compute standard cell potentials E°, standard ΔG°, equilibrium constants K, Nernst equation E under non-standard conditions, and concentration cell voltages with clear steps and shareable URLs.
- ELISA standard curve fitter (4PL/5PL) | calculate concentration from OD | CalcBE
Fit 4PL/5PL to ELISA standards (concentration and OD/signal) and calculate unknown concentrations. Supports weighting (1/y, 1/y²), residuals, back-calculation (recovery), share URL, and CSV/JSON export. Runs in the br…
- Empirical formula calculator — molecular formula & steps | CalcBE
Empirical formula calculator: compute the empirical formula from percent composition (or grams), combustion data, or hydrates, then scale to the molecular formula using molar mass. Step-by-step working included.
- Engineering paper PDF generator | CalcBE
Generate engineering paper with 4/5/10 squares per inch converted to millimeters. Supports A4/Letter, 1-inch bold lines, frame lines, left band, and header boxes. Print or save to PDF, verify scale with the 50 mm cali…
- Epoxy mix ratio calculator (weight & volume) | CalcBE
Split two-component epoxy or paint kits by weight or volume, convert weight ratios with densities, and see Part A/B amounts instantly with a shareable URL.
- Epoxy resin quantity & weight calculator for projects | CalcBE
Estimate epoxy resin volume and weight from area × thickness or box/cylinder molds, apply waste allowance and density, split into safe batches, and share your setup.
- Error propagation calculator – sums, products & powers | CalcBE
Propagate uncertainty for sums, products, powers and general functions using gradient×covariance steps, correlation options and Monte Carlo checks, with templates for common lab calculations.
- Exterior Paint Area & Quantity Calculator | CalcBE
Estimate exterior wall area and paint gallons or liters from building dimensions, wall segments, or a known area. Adjust openings, coats, waste, primer, and coverage presets. Shareable URL. No sign-in.
- Fence Paint Area & Quantity Calculator | Gallons & Liters | CalcBE
Estimate fence paintable area and paint volume from run and height, panel mix, or a known area. Choose one-side/both-side, account for gates, coats, waste, primer, coverage overrides, and share the URL.
- First-order ODEs (Separable & Linear) + Direction Field — with steps | CalcBE
Visualise separable and linear first-order ODEs with slope fields, Simpson integrals, integrating factors, numeric inversion, RK4 checks, CSV export, and shareable URLs.
- Flashcard / index card PDF generator (cut guides) | CalcBE
Auto-arrange 3×5, 4×6, A7 and more flashcards on a page with cut lines or crop marks. Supports duplex templates, back-side transforms, ruled/dot/Q&A layouts, gutter adjustments, SVG/CSV export, and shareable URLs.
- Fraction Calculator (Reduce, Mixed Numbers, Common Denominators) | CalcBE
Enter mixed or improper fractions as-is, perform addition, subtraction, multiplication, or division, and instantly view reduced results, mixed-number forms.
- Free QR code generator & scanner – create, verify, download | CalcBE
Generate QR codes for URLs, text, Wi-Fi, contacts, phone, email, and SMS. Preview and validate instantly, then download PNG/SVG/PDF or share a settings link — all in your browser.
- Full Screen Clock Online – Analog & Digital with Seconds | CalcBE
Free fullscreen clock for your browser. Shows analog & digital time with seconds. Great for study, meetings, and presentations. 12/24-hour, UTC/local, dark mode.
- Function Transformations Explorer (Translate, Scale, Reflect) | CalcBE
Adjust a, b, h and v in y = a·f(b(x−h)) + v to explore shifts, stretches and reflections. Compare graphs side by side. Shareable URL. No sign-in.
- GCD & LCM calculator – greatest common divisor tool | CalcBE
Compute the GCD and LCM for up to 32 integers using Euclid’s algorithm and successive reduction. Paste values and copy a shareable result link.
- GCD & LCM Calculator — step-by-step (Euclid & ladder) | CalcBE
Compute GCD (greatest common divisor) and LCM (least common multiple) with step-by-step Euclidean algorithm, ladder method, and extended Euclid.
- Genetic drift simulator (Wright–Fisher) | allele frequency drift | CalcBE
Simulate genetic drift with the Wright–Fisher model. From N, initial p0, generations, and replicates, visualize trajectories, final distribution, and fixation/loss rates. Includes selection, mutation, migration (advan…
- Genko yoshi manuscript paper PDF generator | CalcBE
Generate genko yoshi manuscript paper in millimeters. Support vertical/horizontal layouts, 400/200 characters, cell sizing, split binding, fold marks, bold lines every 5 cells, and A4/B5/B4/Letter. Export SVG/CSV/shar…
- Graph paper PDF generator | Cartesian, polar, log-log | CalcBE
Generate print-ready SVG graph paper in millimeters: Cartesian, polar, log-log, semilog, and isometric grids with How it's generated steps and CSV export.
- Growth curve fitter (exponential & logistic) | doubling time & K | CalcBE
Fit exponential and logistic growth to time-series data and estimate growth rate r, doubling time, and carrying capacity K. View fitted curves, residuals, and model comparisons (RMSE/AIC) with CSV/LaTeX and share URL.
- Habit Tracker Paper (Printable PDF)｜CalcBE
Generate printable habit tracker paper as precise mm-based SVG. Switch between monthly (multiple habits × days) and yearly (12×31 for one habit), add weekdays/weekly separators/goals/notes, and export as print/PDF, SV…
- Hardy–Weinberg equilibrium and chi-square calculator
Check Hardy–Weinberg equilibrium from genotype counts or allele frequencies, and compute the chi-square statistic and expected genotype frequencies.
- Hemocytometer calculator (cells/mL & viability) | Trypan Blue | CalcBE
Calculate cell concentration (cells/mL) and viability (%) from hemocytometer counts and dilution. Supports improved Neubauer (10^4 factor), examples, warnings, result copy, CSV/LaTeX, and share URLs.
- Hex grid paper PDF generator (chemistry, crystals, maps) | CalcBE
Generate hex grid paper in millimeters with flat-top or pointy-top hexes. Adjust hex size, line width, opacity, major grid intervals, margins, background color, and alignment. Export SVG, CSV, share URLs, and verify s…
- Histogram & cumulative frequency from grouped data | CalcBE
Enter grouped or raw data to build a derived frequency table, histogram (frequency or frequency density), and cumulative frequency ogive. Detect unequal widths, highlight modal/median classes, copy a shareable URL, an…
- House Paint Cost Estimator (Exterior & Roof) | CalcBE
Estimate exterior, roof, trim, fence, and deck paint costs from area or house size using preset or custom unit rates. Add overhead, tax, and share a quick quote. No sign-in.
- Hypergeometric calculator (without replacement) | CalcBE
Compute hypergeometric probabilities (without replacement): P(X=k), tails, and ranges. PMF chart/table, seeded simulation, share URL, and CSV — no sign-in.
- Ideal gas law calculator (PV = nRT & gas laws)
Free ideal gas law calculator to solve PV = nRT, combined gas law problems, and gas density and molar mass with automatic unit conversions.
- Image Resizer & Format Converter | PNG, JPEG, WEBP | CalcBE
Resize and convert images in your browser. Set width, height, format, and quality, then download—no uploads.
- Images to PDF – combine photos in browser | CalcBE
Convert multiple images to a single PDF with page size, orientation, margins, and fit options. Runs fully in your browser with no uploads.
- Inclusion–Exclusion — at least one & none | CalcBE
Compute |A∪B∪…| (“at least one”) for 2–4 sets. For 2–3 sets you can input Venn regions (easy) or intersection sizes. Optionally add N to get “none”, probabilities, exactly 1/2/… counts, and a shareable URL.
- Industrial DFT/WFT & paint consumption calculator | CalcBE
Convert dry/wet film thickness from volume solids, see theoretical coverage and paint use, or reverse-calc DFT from actual consumption with density and a shareable URL — no sign-in.
- Inequality Solver (1 & 2 Variable) — Steps & Graphs | CalcBE
Solve linear, compound, absolute value, quadratic, and rational inequalities with shareable steps, plus half-plane and system visuals that shade the feasible region.
- Integer composition calculator - counts, k parts | CalcBE
Calculate integer compositions where order matters. Get counts for 2^(n-1), exactly k parts, bounded parts, or nonnegative k parts. Includes tables, small-n enumerations, uniform samples with seeds, CSV/TSV exports, a…
- Integer partition calculator - p(n), k parts | CalcBE
Calculate integer partitions p(n) with options for exactly k parts, max part m, distinct/odd/even parts, and bounded ranges. Includes tables, small-n enumerations, uniform samples with seeds, Ferrers diagrams, CSV/TSV…
- Integration calculator – numeric approximations and step-by-step explanations | CalcBE
Compute definite integrals with trapezoid, Simpson, adaptive and Gaussian methods while logging nodes, weights and error estimates. Includes basic antiderivatives and applied examples.
- Interior paint calculator (simple) | CalcBE
Estimate interior wall and ceiling paint area and litres/gallons from room size or a known area. Metric/US units, 1–4 coats, extra allowance, shareable URL. No sign-in.
- Interval Timer (HIIT & Tabata) | CalcBE
Analog + digital interval timer for HIIT/Tabata. Work/rest, rounds/sets, warm-up/cooldown, count-in, sound, and notifications supported.
- Inverse proportion y=k/x explorer | signs & k | CalcBE
Explore the inverse proportion y=k/x with xy=k held constant. Sync equation, table, and graph, highlight quadrants by sign, show asymptotes, tracer, table consistency checks, shareable URL, SVG/CSV exports, and teache…
- IPv4 subnet & CIDR calculator – network address, host range and usable IPs | CalcBE
Convert any IPv4 address and prefix length into its network address, broadcast address, usable host range, and total capacity.
- JSON Formatter & Validator | Pretty-print and check errors | CalcBE
Pretty-print, minify, and validate JSON in your browser. Highlight errors and copy formatted results without sending data to a server.
- Kepler's third law (orbital period) calculator | CalcBE
Kepler's third law calculator: solve orbital period T or semi-major axis a, compare Solar System planets on an a–T chart, and view an orbit diagram — no sign-in.
- LaTeX Equation Editor — Live MathJax, palette, templates, history | CalcBE
A premium LaTeX equation editor with live MathJax preview, caret-aware palette, templates, history, and one-tap copy/share. Tailored for math, physics, and engineering workflows.
- Lens & Mirror Equation — with steps and ray diagram | CalcBE
Compute image distance, magnification, and principal rays for thin lenses or mirrors with a live How it's calculated log, CSV export, and shareable links.
- Lens and mirror equation & magnification calculator
Free lens and mirror equation calculator for thin lenses and spherical mirrors. Compute image distance, magnification, and classify images as real or virtual, upright or inverted.
- Ligation molar ratio calculator | Vector:insert amounts | CalcBE
Calculate required insert mass (ng) and volume (µL) from vector mass, length, and desired molar ratio (e.g., 1:3). Includes presets, copy, CSV/JSON, and share URL.
- Limits Explorer — One-sided limits & numeric L'Hôpital | CalcBE
Diagnose indeterminate forms, apply numeric L'Hôpital, sample one-sided limits, and visualise the graph near the approach point. Shareable URL, LaTeX copy, and CSV export included.
- Linear equation solver with both-side steps | CalcBE
Linear equation solver that logs each same-operation step. Clear denominators, handle fractions and parentheses, verify the answer, and share URLs or LaTeX/SVG from the browser.
- Linear function y=ax+b explorer | formula & graph | CalcBE
Explore y=ax+b by syncing formula, table, and graph. See slope triangles and difference tables, infer a and b from two points or a data table, drag anchors, share URLs, and export SVG/CSV with a teacher mode.
- Linear Regression & Correlation — Scatter, OLS/WLS, R² (with steps) | CalcBE
Paste x,y[,w] data or upload a CSV to fit OLS, WLS or Theil–Sen regression. See the fitted line, 95% bands, residual plots and key tests on one interactive chart.
- Linear systems solver – 2×2 and 3×3 equation systems with step-by-step working | CalcBE
Solve 2×2 and 3×3 systems of linear equations with Gaussian elimination (RREF), classify solutions, show parametric forms, residuals, elimination steps, and optional 2×2 Cramer's rule.
- Linear Systems Solver with RREF Steps (2×2 & 3×3) | CalcBE
Reduce 2×2 and 3×3 linear systems with Gaussian or Gauss-Jordan elimination, log every row operation, keep exact fractional answers, and share matrices in one click.
- Lined paper PDF generator – ruled paper in mm | CalcBE
Generate lined (ruled) paper as an SVG in millimeters. Adjust line spacing, margins, margin lines, bold lines, calibration box, and hole-punch guide. Print or save to PDF, export settings to CSV, and share a URL to re…
- List Shuffler (Random Order Generator) – fair shuffle | CalcBE
Shuffle a list fairly with Fisher–Yates. Copy results, share a URL, and optionally reproduce the same order with a seed—runs locally in your browser.
- Log Laws Transformer (with steps) — expand, condense, change of base | CalcBE
Expand, condense, and evaluate logarithms with shareable steps. Convert between bases (log10 and ln), copy LaTeX, and guide lessons with teacher mode.
- Long addition & subtraction (decimal carry/borrow) | CalcBE
See column addition or subtraction with decimals, carry, and borrow explained per digit. Copy a shareable URL or LaTeX, switch to teacher mode, and keep trailing zeros if you need them.
- Long Division Calculator (Steps, Quotient, Remainder) | CalcBE
See quotient, remainder, and step-by-step long division with layout. Supports decimals and repeating decimals. Teacher mode, shareable URL, LaTeX. No sign-in.
- Lottery odds calculator – tiers & expected value | CalcBE
Calculate lottery odds by prize tier: total win odds, “1 in X”, multi-ticket chances, expected value (EV), simulation, CSV, shareable URLs — no sign-in.
- Mean and Standard Deviation Calculator (Population vs Sample) | CalcBE
Paste or type your dataset to compute count, mean, variance, and standard deviation (population N and sample N‑1), then copy a shareable result link.
- Mendelian ratio chi-square test calculator | 3:1, 9:3:3:1 | CalcBE
From observed counts and expected ratios (3:1, 9:3:3:1, etc.), calculate χ², df, and p-value. Includes expected counts, contributions, observed vs expected charts, steps, CSV/LaTeX, and share URL.
- Merge PDFs – reorder and combine multiple files locally in your browser | CalcBE
Merge multiple PDFs in your browser. Reorder files, choose page ranges if needed, and download instantly with no uploads.
- Michaelis–Menten fitter (Km, Vmax) | nonlinear fit | CalcBE
Estimate Km and Vmax by nonlinear fitting of the Michaelis–Menten equation from substrate [S] and initial rate v. Shows scatter + fit, residuals, and R²/RMSE (guide), with copy, CSV/LaTeX, and share URL.
- Modular arithmetic calculator – GCD, inverse & CRT | CalcBE
Compute extended GCD, modular inverses, fast power, CRT and linear congruences with BigInt precision. Review every iteration in a How it's calculated table, export CSV and share setups by URL.
- Momentum & 1D collision calculator
Free physics calculator for 1D collisions using conservation of momentum and coefficient of restitution. Compute final velocities and energy loss with step-by-step explanations.
- Multi Timer | CalcBE
Manage multiple countdown timers at once with analog + digital views, fullscreen focus, sound/notifications, presets, saving, and sharing.
- Multiset permutation & anagram count calculator | CalcBE
Compute the multiset permutation (anagram) count using n!/(n1!...nk!). Exact BigInt or Approx mode, with steps and shareable URLs.
- Multistep yield planner – overall yield & bottlenecks | CalcBE
Plan multi-step syntheses with per-step yields, compute overall yield forward or backward, highlight bottlenecks, and export tables or URLs.
- nCr & nPr calculator (permutations & combinations) | CalcBE
Compute nCr (combinations), nPr (permutations), and factorial (n!). Exact BigInt results, step logs, teacher mode, and shareable links.
- NGS coverage calculator (average depth) | required reads back-calculation | CalcBE
Estimate average NGS coverage depth. Calculate depth from target size and read count (PE/SE) or total yield (Gb), with usable, mapping, on-target, and duplicate rates. Back-calculate required reads/Gb for target depth…
- NGS library concentration (ng/µL → nM) | dilution & pooling | CalcBE
Convert NGS library concentration from ng/µL and fragment length to nM, then calculate normalization dilutions and pooling (equal volume or equal molar). Supports table input, examples, copy, CSV/JSON, and share URLs.
- Normal Distribution & Z-Score Calculator – CDF, PDF, quantiles | CalcBE
Compute normal CDF/PDF, z-scores, tail probability, intervals, and quantiles from μ and σ. Shaded curve, step-by-step, teacher mode. No sign-in.
- Ohm's law and simple DC circuit calculator
Free calculator for Ohm's law and simple DC circuits. Solve voltage, current, resistance, power, and equivalent resistance in series or parallel.
- Online Alarm (Browser Alarm Clock) | CalcBE
Analog + digital clock display with multiple alarms, snooze, notifications, and fullscreen support in your browser.
- Online Stopwatch with Analog + Digital Display | CalcBE
Run a high-precision stopwatch with analog and digital displays, lap tracking, fullscreen, keyboard shortcuts, and a shareable settings URL. Works entirely in the browser.
- Online Timer (Countdown) | Analog & Digital | CalcBE
Set an online countdown timer with analog and digital displays, presets, quick adjustments, fullscreen, keyboard shortcuts, and a shareable settings URL.
- Page numbers & watermarks – stamp PDFs in browser | CalcBE
Add page numbers or text watermarks to a PDF entirely in your browser. Choose positions, formats, ranges, and opacity—no uploads.
- Paint Coverage Calculator | Liters & Gallons Estimate | CalcBE
Estimate paint from room dimensions or custom surfaces. Adjust coats, waste, substrate absorption, and primer to see liters, gallons, and suggested can counts. No sign-in.
- Paper templates hub (lined, grid, Cornell, to-do) | CalcBE
Find lined paper, dot grid, Cornell notes, to-do sheets, habit trackers, graph paper, and more. Adjust in millimeters, print to PDF, export SVG, and share URLs to reuse the same layout.
- Partial fractions calculator – decomposing rational expressions with steps | CalcBE
Decompose rational functions into partial fractions with polynomial long division, Durand-Kerner factorisation, Gaussian elimination, LaTeX, CSV, and shareable URLs.
- Partial pressure & gas mixing calculator – Dalton's law | CalcBE
Apply Dalton's law for gas mixtures, run two-tank isothermal mixing and wet-gas corrections, and compare ideal vs van der Waals pressure with clear logs, CSV export and shareable URLs.
- Pascal's Triangle & Binomial Expansion (with steps) | CalcBE
Generate Pascal rows, combinations, and binomial expansions with BigInt accuracy. Watch How it's calculated, export CSV logs, inspect row identities, and share lesson-ready URLs.
- Passphrase generator (Diceware-style) – random words | CalcBE
Generate a strong passphrase from random words (Diceware-style) locally in your browser. Choose word count, separators, and case, then copy or download. Share settings-only URLs (no passphrases).
- Password generator – strong secure random passwords | CalcBE
Generate strong random passwords in your browser with crypto.getRandomValues. Exclude ambiguous characters, meet rules, copy or download. Share settings only (no passwords in URLs).
- Pattern String Generator — business IDs & sequences | CalcBE
Generate business-style IDs from a pattern (date, sequence, random). Runs locally in your browser — no uploads; share settings-only URLs.
- PCR master mix calculator | reactions, concentrations, overage | CalcBE
Calculate PCR/qPCR master mix volumes from reaction volume/count and stock/final concentrations. Supports overage (% or +1), 96/384 wells, protocol text, CSV/JSON, and share URLs.
- PDF compressor – shrink large PDF files in your browser without uploads | CalcBE
Reduce PDF size entirely in your browser. Choose quality presets or custom DPI/quality, convert to grayscale, and download instantly without uploading files.
- PDF form filler & flattener – complete forms and lock in answers in your browser | CalcBE
Fill PDF form fields, preview highlights, keep fields editable or flatten them, and download instantly. All changes stay in your browser.
- PDF highlighter & annotator – markup in browser | CalcBE
Highlight, draw, and place text notes on PDFs in your browser. Navigate pages, undo steps, and export a flattened annotated PDF—no uploads.
- PDF metadata editor – edit title, author & keywords | CalcBE
Read and update PDF metadata such as title, author, subject, keywords, and dates entirely in your browser. No uploads required.
- PDF page organizer – reorder, rotate & delete pages | CalcBE
Reorder, rotate, duplicate, or delete PDF pages in your browser. Drag thumbnails, then export a new PDF without uploading files.
- PDF sign & stamp tool – add signatures and approval stamps in your browser | CalcBE
Create a signature, place it on pages, add dates or approval stamps, and export a signed PDF. All processing stays in your browser.
- PDF to EMF converter – preserve vectors & text positions | CalcBE
Convert PDF to EMF in your browser while preserving vectors and text positions. Download page-by-page EMF files or a ZIP. Files never leave your device.
- PDF to images converter – export PDF pages as PNG or JPEG files in your browser | CalcBE
Convert PDF pages to PNG or JPEG entirely in your browser. Choose resolution, format, and page ranges, then download each page or a ZIP—no uploads required.
- PDF to SVG converter – preserve vectors & text positions | CalcBE
Convert PDF pages to SVG in your browser while preserving vectors and text positions. Choose page ranges, download single SVGs or a ZIP, and keep files local.
- PDF to text converter – extract text in browser | CalcBE
Extract text from PDFs entirely in your browser. Combine pages or keep per-page output, choose layout or paragraph mode, and download as TXT with no uploads.
- PDF Tools (browser-only) | Compress, merge, convert, annotate | CalcBE
A fast, private PDF toolkit that runs entirely in your browser: compress, merge, split, convert images, extract text, add watermarks, and more without uploading files.
- Permutation test – exact p-value for A/B and paired | CalcBE
Run a permutation (randomization) test for two independent groups or paired samples. Visualize the null distribution and download a JSON/CSV report — all in your browser.
- Poker odds calculator – hand probabilities, outs & Hold'em | CalcBE
Calculate poker odds: hand probabilities, outs hit rates, and Texas Hold'em distributions. Exact enumeration when possible (simulation fallback). No sign-in; shareable URLs.
- Pomodoro Timer with Analog & Digital Display | CalcBE
Run a pomodoro timer with analog and digital displays, automatic phase transitions, local stats, fullscreen, keyboard shortcuts, and a shareable settings URL.
- Primary handwriting paper PDF generator (3-line) | CalcBE
Generate primary handwriting paper with headline + dashed midline + baseline. Adjust ruling height, midline position, margins, colors, and number of pages, then download a print-ready PDF.
- Prime factorization calculator – primes, divisors | CalcBE
Factor any positive integer into primes and see exponents, divisor counts and primality. Copy a shareable result link for homework or quick checks.
- Prime Factorization with Steps & Factor Tree | τ(n), σ(n), φ(n) | CalcBE
Factor any integer into primes, see every trial division step, compute τ(n), σ(n), φ(n), and draw the factor tree. Optional second integer shows gcd/lcm via exponents.
- Primer Tm calculator | PCR annealing temperature guide | CalcBE
Calculate primer Tm from DNA sequences (5'→3') and estimate annealing temperature (Ta). Switch between recommended nearest-neighbor and simple formulas, set Na+/primer concentration, enter forward/reverse pairs, and e…
- Probability tree & 2×2 table — AND/OR & complement | CalcBE
Probability tree & 2×2 table tool for AND/OR/NOT and complements. Highlights matching paths/cells and explains products, sums, and 1−P with steps. Copy a shareable URL, SVG, or LaTeX.
- Projectile motion calculator (time of flight, range, height) | CalcBE
Free projectile motion calculator to find time of flight, horizontal range, maximum height, and required launch speed for a target. Copy a shareable URL—runs in your browser.
- Punnett square generator (1- and 2-gene) | automatic ratios | CalcBE
Generate a Punnett square from parent genotypes (AA/Aa/aa, AaBb, etc.) and summarize genotype proportions (%/ratio). Optionally show phenotype ratios (guide) assuming complete dominance. Includes examples, Markdown ta…
- Pythagorean theorem calculator | Diagram & area model | CalcBE
Solve and visualize a²+b²=c² with a right-triangle diagram and area model. Find any side, check a triangle, or measure distance with exact radicals, steps, shareable URL, LaTeX, and SVG.
- qPCR standard curve calculator (efficiency, R², unknowns) | CalcBE
Build a qPCR standard curve from Quantity and Ct, calculate slope, intercept, R², and PCR efficiency (%). Back-calculate unknown quantities with residuals, 95% bands, step logs, CSV/LaTeX, and share URLs.
- Random CSV generator – test data & schema JSON | CalcBE
Generate random CSV test data in your browser. Define columns, preview rows, then download CSV and schema JSON — no uploads and share settings-only URLs.
- Random Date & Time Generator – random datetime/timestamp | CalcBE
Generate random dates, times, and datetimes in your browser. Choose a range, weekdays, exclusions, time windows, and steps. Copy/download results and share settings-only URLs.
- Random distributions: samplers, tests & visualizers | CalcBE
Generate random samples from distributions, visualize histograms, and sanity-check randomness in your browser. No uploads; share settings-only URLs.
- Random JSON Generator (Test Data) — array & NDJSON | CalcBE
Generate JSON test data from a schema. Export as JSON array or NDJSON. Runs locally in your browser — no uploads; share settings-only URLs.
- Random Log Generator — Nginx, Apache & JSON logs | CalcBE
Generate fake access logs (Nginx/Apache) or JSONL logs with controllable distributions. Runs locally — no uploads; share settings-only URLs.
- Random number generator – integers, decimals, seeds | CalcBE
Generate random integers or decimals in your browser with optional seeds, unique values, and copyable results. Runs locally — no sign-in, no uploads.
- Random Picker | Draw winners without repeats
Pick one or more random items from a list in your browser. Great for lotteries, giveaways, and classroom activities. Everything runs locally without sending data to the server.
- Random SQL INSERT Generator — Postgres, MySQL, SQLite | CalcBE
Generate SQL INSERT statements from a schema for Postgres, MySQL, or SQLite. Runs locally in your browser — no uploads; share settings-only URLs.
- Random test data generators (CSV, IDs, time) | CalcBE
Create CSV test data, random IDs, and timestamps locally in your browser. No uploads; share settings-only URLs.
- Random tools – generators, pickers, shuffles | CalcBE
Random generators and pickers that run entirely in your browser: numbers, dates, CSV test data, tokens, UUIDs, shuffles, and verifiable draws.
- Randomness beacon verifier – paste a beacon to verify draws | CalcBE
Paste a public beacon value to verify a deterministic draw or shuffle. Create a commit hash, reproduce results, and download JSON/CSV/PNG — runs locally.
- Randomness tests – chi-square, runs, ACF, JB | CalcBE
Run chi-square, runs, autocorrelation, and Jarque–Bera on bit or number sequences. Visualize results and download a report—runs locally in your browser.
- Ratio & Proportion Solver — Steps + Percent | CalcBE
Simplify ratios, solve proportions, and convert percentages with step-by-step working. Teacher mode, LaTeX export, and shareable links.
- RC / RL / RLC Calculator — time constant, cutoff, resonance & phase (with steps) | CalcBE
Analyse RC, RL, and RLC networks with step-by-step formulas. Compute time constants, divider gain, resonance, and equivalent series or parallel values with shareable results.
- Reaction kinetics & half-life calculator | CalcBE
Online reaction kinetics calculator for 0th, 1st and 2nd order reactions. Compute half-lives and rate constants, fit data and analyse Arrhenius plots.
- Reagent table & reaction scale – export CSV/TSV | CalcBE
Create reagent tables from a base amount, convert equiv/mol%/ppm to mmol, grams, and mL, then export TSV/CSV or share a URL for lab notes.
- Repetition calculator – n^r & nHr (multichoose) with steps | CalcBE
Calculate permutations with repetition (n^r) and combinations with repetition (nHr = C(n+r-1,r)) with Exact BigInt results or fast scientific-notation approximations. Includes step logs, teacher mode, and shareable URLs.
- Resistor Color Code Calculator (4/5/6 Band) | CalcBE
Decode 4/5/6-band resistor color codes (or get colors from a value). Shows tolerance, TCR, nearest E24/E96 values, and a shareable URL.
- Riemann Sums Calculator | Left/Right/Trapezoid/Simpson | CalcBE
Visualise left/right, midpoint, trapezoid and Simpson sums for f(x), compare with an adaptive Simpson reference, and export CSV or share a link.
- Roof Paint Area & Quantity Calculator | CalcBE
Estimate roof paintable area and paint gallons or liters from building size + slope, roof planes, or a known area. Adjust overhangs, skylights, coats, waste, primer, and coverage presets. Shareable URL. No sign-in.
- Rounding & error bands | Intermediate vs final | CalcBE
Round any number, highlight the digit you inspect, and see the error band on a number line. Compare intermediate vs final rounding with the same settings, copy a shareable URL or LaTeX, and save the SVG for class use.
- Sampling & Bootstrap — CLT Explorer (with steps) | CalcBE
Simulate samples from common distributions, bootstrap means or proportions, and see CLT histograms with step-by-step explanations for classroom demos.
- Scientific calculator – trig, logs, powers and degree / radian angle modes | CalcBE
Run trig, logs, exponents, and factorials with Deg/Rad modes, keyboard input, memory, and a shareable URL that preserves your expression and settings.
- Seating Chart Generator (Random) — Classroom & Tables | CalcBE
Free online seating chart generator for classrooms and events. Create random layouts with fixed seats and avoid-adjacency pairs. No sign-up. Print or export CSV/JSON/HTML.
- Secret Santa generator (exclusions) – draw names fairly | CalcBE
Generate Secret Santa assignments in your browser. Add exclusions (NG pairs) and groups, then reveal recipients one by one to reduce accidental leaks. Copy, download, and share settings-only URLs.
- Sector arc length, area & angle calculator | CalcBE
Solve a sector’s arc length l, area A, central angle θ, or radius r with units and a live diagram. See the θ/360 ratio, validation against 2πr and πr², example chips, teacher mode, shareable URL, LaTeX copy, and SVG e…
- Sequences & Series (Arithmetic / Geometric) — terms & sums with steps | CalcBE
Compute arithmetic and geometric sequences with step-by-step logs: nth terms, partial sums, solving for n or k, two-point inference, and table generation with shareable outputs.
- Seyes (French ruled) paper PDF generator | CalcBE
Generate Seyes/French ruled paper in millimeters. Standard 2 mm minors + 8 mm majors, 8 mm verticals, red margin line, enlarged 3 mm/12 mm, A4/B5/Letter. Print at 100%, export SVG/CSV, and share URLs.
- Shuffle bias comparison – naive vs Fisher–Yates | CalcBE
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- Signed number line calculator & sign rules | CalcBE
Add, subtract, multiply, and divide signed numbers with a number-line animation for plus/minus moves. See the sign table for × and ÷, play the steps, copy LaTeX or the result, download the SVG line, and share a URL wi…
- Significant Figures & Scientific Notation Calculator (with steps) | CalcBE
Count significant figures, convert to scientific notation, and apply rounding rules for + − × ÷ with step-by-step logs, CSV export, and textbook vs final rounding.
- Similarity ratio calculator – side, area, volume | CalcBE
Enter a similarity ratio (small:large) to see side/perimeter, area (square), and volume (cube) ratios with scale factors. Solve unknown values, infer from area/volume via √/∛, and share 2D/3D visuals, steps, SVG, and…
- Simple harmonic motion (SHM) calculator
Free SHM calculator for a mass–spring oscillator and a small-angle pendulum. Compute period, angular frequency, max speed, acceleration, and energy with step-by-step formulas.
- Simple Harmonic Motion (SHM) simulator — with steps and energy | CalcBE
Simulate spring-mass simple harmonic motion with analytic, Euler-Cromer, or RK4 steps, inspect omega, period, energy, shareable logs, plots, and CSV exports.
- Simultaneous equations solver with graph view | CalcBE
Solve simultaneous linear equations with elimination, substitution, and graph views. Fractions and decimals are normalized, no solution or infinite solution is classified, and you can copy a shareable URL, LaTeX, and…
- Snell's law & total internal reflection calculator
Interactive Snell's law calculator for refraction and critical angle, including total internal reflection checks and step-by-step explanation.
- Solubility product (Ksp) & precipitation calculator | CalcBE
Compute molar solubility from Ksp, recover Ksp from measured solubility, test Q vs Ksp for precipitation, and explore simple fractional precipitation ranges with step-by-step explanations.
- Solution recipe calculator – volume & concentration | CalcBE
Generate lab-ready solution recipes from solids or stock solutions, including simple and serial dilutions, with clear step-by-step instructions and shareable URLs.
- Split PDF files – extract page ranges or every N pages locally in your browser | CalcBE
Split a PDF into multiple files directly in your browser. Use page ranges, one-per-page, or every N pages—download results as a ZIP with no uploads.
- Square root simplifier with factor tree & steps | CalcBE
Simplify square roots to a√b with factor tree, pairing highlights, and steps. Show decimals with square bounds, load examples, copy LaTeX, and export SVG.
- Staff paper PDF generator | CalcBE
Generate staff paper in millimeters. Adjust staff spacing, system count (auto/manual), bar guides, lyric lines, and title fields. Supports A4/B5/Letter, SVG/CSV/share URLs, and print at 100% with the 50 mm calibration…
- Standard calculator (history tape & memory) | CalcBE
Perform four‑function math with parentheses and percent, a running tape, and memory slots—fully keyboard accessible, with a shareable result link.
- Standing waves calculator: vibrating strings and air columns
Free standing wave calculator for strings and tubes. Enter length, tension & density or sound speed to list mode frequencies, wavelengths, and steps instantly.
- Stars and bars calculator – combinations with repetition | CalcBE
Stars and bars (multichoose): count integer solutions to x1+…+xk=n with constraints (xi≥0/1, xi≥ai, ai≤xi≤bi). Exact BigInt results with steps, examples, and shareable links.
- Step-by-step solution PDF exporter — multi-language, A4/Letter, shareable JSON
Build printable How it's calculated guides with numbering styles, attachments, and A4/Letter layouts. Export JSON, copy doc= base64url links, and print classroom-ready PDFs.
- Stirling numbers table (first & second kind) | CalcBE
Generate tables for Stirling numbers of the first and second kind plus Bell numbers. Inspect S(n,k), s(n,k), c(n,k), meanings, recurrences, exact BigInt or modulo values, CSV/TSV export, and shareable URLs.
- Stochastic process visualizer – random walk & Markov chain | CalcBE
Visualize random walks (1D/2D) and Markov chains from a transition matrix. See trajectories, MSD, and stationary distribution, then download results.
- Stoichiometry calculator (limiting reactant & percent yield) | CalcBE
From a balanced chemical equation, compute limiting reactant, theoretical yield, leftover amounts, and percent yield from moles or masses.
- Study timetable (time blocking) PDF generator | CalcBE
Create weekly or daily time-blocking timetables in millimeters. Adjust start/end times, 15/30/60-minute slots, day count, break highlights, memo/to-do areas, bold line intervals, calibration box, and shareable URLs. P…
- Surface & volume nets (prism/pyramid/cylinder/cone/sphere) | CalcBE
Compute surface area and volume for prisms, pyramids, cylinders, cones, and spheres with synced 3D sketches and nets. See lateral vs base breakdowns, slant height, units, teacher mode, examples, shareable URLs, and SV…
- Synthetic Time Series Generator — trend, seasonality & noise | CalcBE
Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers. Runs locally — no uploads; share settings-only URLs.
- TAB sheet PDF generator | CalcBE
Generate guitar/bass TAB sheets in millimeters. Set string count, spacing, auto/manual systems, bar/beat guides, tuning boxes, and A4/B5/Letter paper. Export SVG/CSV, share URLs, and verify scale with the 50 mm calibr…
- Target yield calculator – back-calculate reagent table | CalcBE
Enter a reaction and target product mass to back-calculate base and reagent amounts, with auto-balancing, steps, and shareable tables.
- Taylor & Maclaurin Series — with steps and graphs | CalcBE
Build Taylor and Maclaurin polynomials P_n(x) with symbolic derivatives or fallback fits, then compare f and P_n on one graph. Review error summaries and step-by-step working for each example.
- Team generator – random teams & groups | CalcBE
Split a list of names into random teams or groups in your browser. Choose number of teams or team size, add simple constraints, then copy or download results. Share settings only (no names in URLs by default).
- Text Case Converter — upper/lower/title, snake/camel/kebab | CalcBE
Convert text between upper, lower, title, sentence, snake_case, camelCase, and kebab-case instantly in your browser.
- Thermodynamic process & PV diagram calculator (ideal gas)
Free thermodynamic process calculator for ideal gases. Compute work, ΔU, and heat for isothermal, isobaric, isochoric, adiabatic, and polytropic processes, and see the PV diagram.
- Todo checklist paper PDF generator (printable) | CalcBE
Generate printable todo/checklist paper with checkboxes. Adjust columns, row height, due/priority/notes fields, and a 50 mm calibration square in millimeters. Print to PDF, export settings to CSV, and share a URL to r…
- Token generator – secure random strings (base64url, hex) | CalcBE
Generate secure random tokens and random strings locally in your browser. Choose base64url, hex, or a custom charset. Copy, download, and share settings (no tokens in URLs).
- Triangle Solver — Law of Sines/Cosines (SSA ambiguous) | CalcBE
Solve triangles with SSS, SAS, ASA/AAS, and the ambiguous SSA case. See step-by-step formulas, switch degree/radian output, pick decimal places, and view an annotated diagram. No sign-in.
- Triangle Solver (SSS / SAS / ASA, Area & Circumradius) | CalcBE
Select the known combination (three sides, two sides plus the included angle, or two angles plus the included side) and this tool will compute the remaining.
- Triangular Distribution Generator (min/mode/max) | CalcBE
Generate samples from a triangular distribution using min/mode/max and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
- TRPG dice check (d20/d100, pools) with PNG sharing | CalcBE
Run d20/d100 checks with advantage/disadvantage, compare vs DC, and roll dice pools to count successes. Share as text, PNG, or URL — all in your browser.
- Truncated Normal Generator & Visualizer (bounded normal) | CalcBE
Generate samples from a truncated normal distribution with lower/upper bounds and visualize the PDF/CDF and histogram. Runs locally — no uploads; share settings-only URLs.
- Truth Table & Logic Evaluator — DNF/CNF Simplifier | CalcBE
Build Boolean truth tables up to 10 variables, export canonical DNF/CNF, simplify with Karnaugh or Quine–McCluskey, and share CSV or URL with How it’s calculated steps.
- Unit Circle & Trig Explorer — amplitude, period & phase | CalcBE
Explore y = A·f(bx+φ)+D for sine, cosine and tangent, syncing the unit circle and graph as you change amplitude, period and phase. Export sample values or share an interactive state.
- UNIX Timestamp Converter (Seconds/Millis to Date) | CalcBE
Convert Unix seconds/millis and date/time across Local, UTC, and IANA time zones with copy buttons and shareable URLs.
- UUID Generator (v4/v7) – bulk, format, validate, and parse | CalcBE
Generate UUID v4 or UUID v7 in bulk, format them (canonical/URN/braces), copy or download, and validate UUIDs with v7 timestamp decoding—runs locally in your browser.
- Vector Calculator — dot/cross, projection, angle, area, triple (with steps) | CalcBE
Compute norms, dot, cross (2D/3D), projection, angle, areas, and triple product with step-by-step logs. 2D diagram, shareable URL, LaTeX and CSV export.
- Verifiable random draw (commit-reveal) – auditable picker | CalcBE
Run a verifiable random draw using a commit-reveal scheme. Publish a commitment hash first, reveal the seed later, and let anyone reproduce and verify the results—runs locally in your browser.
- Voltage divider & LC resonance calculator – gain & cutoff | CalcBE
Design DC voltage dividers with loading and reverse solves, and compute LC resonance, reactance, Q and bandwidth with SI prefixes, E-series rounding and CSV export for lab or hobby projects.
- Weibull Distribution Generator & Visualizer | CalcBE
Generate random samples from a Weibull distribution and visualize the PDF and histogram. Runs locally — no uploads; share settings-only URLs.
- Weighted Random Picker – random choice with weights | CalcBE
Pick random items with weights (probability ratios). Use an optional seed for reproducible draws and share your setup via URL—runs locally in your browser.
- Word Problem Wizard — percent, ratio, speed & concentration | CalcBE
Solve common word problems by choosing a template and entering values with units. Get diagrams, formulas, step-by-step hints, and checks for percent, ratio, speed, and salt-solution concentration.
- Work, energy & power calculator
Physics calculator for work, kinetic and potential energy changes, and average power. See how force, displacement, mass, speed and height relate in one place.
- Zenkaku/Hankaku Converter – kana, fullwidth/halfwidth | CalcBE
Convert Japanese text between fullwidth/halfwidth and Hiragana/Katakana in your browser. Your text never leaves your device.
- ΔCt / ΔΔCt calculator (relative expression) | CalcBE
Paste qPCR Ct values to calculate ΔCt/ΔΔCt and relative expression (2^-ΔΔCt). Supports calibrator selection, multiple reference genes, Pfaffl efficiency correction, plots, step logs, CSV/LaTeX, and share URLs.
Education & study
Plan GPA scenarios, track coursework, and set targets for final exams.
- GPA Calculator (Weighted & Unweighted Course Average) | CalcBE
Compute weighted and unweighted GPA with editable scales, Honors/AP bumps, and shareable course tables. Includes how the math works and FAQs.
- GPA Calculator — cumulative & final grade needed | CalcBE
Calculate term and cumulative GPA (weighted or unweighted), convert letter↔percent, estimate the minimum final exam score to reach your target, and copy a shareable URL.
- CGPA ↔ Percentage Converter (Educational)
Convert between CGPA and percentage using example mappings (9.5×CGPA or 10×CGPA). Institutions differ—always confirm your institution’s rule.
- Deviation Score (T-score) & Percentile Calculator | CalcBE
Calculate z-score, deviation score (T-score / hensachi), and percentile. Supports input from mean & standard deviation, or from a score list / frequency table.
- Embed Builder — share links & iframe code | CalcBE
Create CalcBE share links and responsive iframe embeds. Supports presets, UTM tags, base64url cfg, optional hash mode, and an auto-height snippet.
- Fraction Simplifier & Mixed Number Converter (Steps & Visuals) | CalcBE
Reduce any fraction, convert between improper and mixed numbers, and review Euclidean GCD steps with pie and number line visuals for lessons.
- Kinematics: SUVAT / Projectile / Free Fall (steps) | CalcBE
Solve SUVAT unknowns, 2D projectile motion and free-fall on one page. Get step-by-step logs, quadratic root reasoning, shareable URLs, plots, and teacher notes.
- Limiting reagent calculator (with steps) | CalcBE
Auto-balance reactions, convert grams ↔ moles (purity optional), and get limiting reagent, theoretical yield, and percent yield — step by step.
- Matrix Calculator — RREF / Solve Ax=b / Inverse / Determinant (with steps) | CalcBE
Compute RREF, solve Ax=b, find the inverse, determinant, rank, null space, row and column spaces with detailed elimination logs. Supports exact fractions, decimals, shareable URLs, and LaTeX export.
- Number line & interval visualizer (inequality shading)
Shade inequalities and interval unions on an interactive SVG number line. Visualize algebra steps, export SVG/PNG, and copy share-ready URLs for lessons.
- Quick charts from pasted data — scatter / box plot + regression (with steps, PNG/PDF)
Paste spreadsheet data to generate scatter and box plots instantly. Includes OLS, Theil–Sen, and polynomial regression with step-by-step math plus PNG/PDF export.
- Worksheet & Quiz Auto-Generator (steps & PDF)
Worksheet & quiz auto-generator with steps (PDF) - linear, quadratic, factoring, fractions, ratios. Deterministic seed for reproducible class handouts.
Life & health
Track personal indicators while keeping privacy and control offline.
- BMI calculator (kg/cm) – BMI & WHO category | CalcBE
Enter weight (kg) and height (cm) to get your BMI and WHO category instantly. Copy a shareable result link. Informational only—not medical advice.
- BMR & TDEE calculator – daily calorie needs and energy use | CalcBE
Estimate your basal metabolic rate and total daily energy expenditure with the Mifflin-St Jeor equation. Enter your age, sex, height, weight and activity level to see maintenance calories.
- Ideal weight calculator – Devine, Hamwi and BMI ranges for adults | CalcBE
Estimate ideal body weight with the Devine, Hamwi, Robinson and Miller formulas, set a custom BMI goal, and compare kg/lb outputs. Informational only.
- Body Fat Percentage Calculator | US Navy & BMI | CalcBE
Estimate body fat percentage using US Navy circumference and BMI (Deurenberg). Switch metric/US units, compute fat and lean mass, and save recent runs — no sign-in. Informational only.
- Due Date Calculator (LMP, IVF, Ultrasound) | CalcBE
Estimate your due date and today’s gestational age from LMP, conception, IVF transfer, or ultrasound. Shows trimester milestones. Planning only — no sign-in.
- 1RM (One-Rep Max) & Training Weight Calculator | CalcBE
Estimate your 1RM from weight and reps using common formulas, then convert to training weights by %1RM or target reps. Includes rounding options and Training Max (TM).
- Calorie & Weight-loss Planner | TDEE, Targets, Timeline | CalcBE
Estimate your TDEE, set a calorie target to hit your goal weight by a chosen date, or see how long it will take at your current intake. Includes macro split guidance. Informational only.
- Heart Rate Zone Calculator | CalcBE
Calculate heart rate training zones (Zone 1-5) using %HRmax, Karvonen (HRR), or %LTHR. Zone 2 highlight, copy table, shareable URL, and custom boundaries. No sign-in.
- Running Pace, Time and Distance Calculator | CalcBE
Solve running pace, time, or distance from the other two. Race presets (5K, 10K, half, marathon) with min/km or min/mile plus km/h speeds and lap splits.
Cooking & kitchen
Convert recipe measurements, scale batches, and stay organised in the kitchen.
- Recipe Scaler (Paste ingredients, resize servings) | CalcBE
Paste a recipe ingredient list and scale it instantly by servings or multiplier. Handles fractions like 1 1/2 and ½. Copy results, share URLs, export CSV.
- Cups to grams converter (ingredient density + recipe scaling) | CalcBE
Convert cups, tbsp, tsp, ml ↔ grams/oz using ingredient densities, then scale the whole recipe with one slider.
- Cake pan size converter - round, square & sheet pans | CalcBE
Convert round, square, and rectangular pan sizes to get the batter scaling factor by area or volume. Supports mm, cm, and inches with shareable URLs.
- Microwave wattage time converter – convert cooking time by power | CalcBE
Convert microwave cooking time between wattages (700W, 900W, 1000W). Instant result, rounding options, and a shareable conversion chart — no sign-in.
- Oven Temperature Converter (°C, °F, Gas Mark, Fan) | CalcBE
Convert oven temperatures between Celsius, Fahrenheit, Gas Mark, and fan-assisted (convection). Includes recipe rounding, a fan adjustment, and a quick reference table.
- Oven to air fryer conversion calculator (temp & time) | CalcBE
Convert oven recipe temperature (°C/°F/Gas Mark) and time to air fryer settings as a quick guideline. Choose a standard / gentle / strong preset, and copy a shareable URL.