Start here
Pick one task first: equations, percentages, geometry, or probability.
Open Featured for the most common classroom workflows.
Use Math & statistics when you need the full tool list.
Featured
- 2D graphing calculator – plot and intersect functions.
Plot up to three functions, find intercepts, intersections and extrema numerically, and explore the graph with zoom.
- Quadratic & Polynomial Solver with Steps.
Solve quadratic and degree-3 polynomial equations with exact and decimal roots, discriminant checks, factorization.
- Quadratic equation solver – roots, discriminant.
Solve ax² + bx + c = 0 and see real or complex roots, the discriminant, vertex form and a quick graph.
- Fraction Simplifier & Mixed Number Converter.
Reduce any fraction, convert between improper and mixed numbers, and review Euclidean GCD steps with pie and number.
- Percentage Calculator (X% of Y, increase/decrease).
Work out X% of Y, what percent one number is of another, and the new value after a percent increase or decrease.
Math & statistics
- Pi lab.
Explore how pi is approximated with polygons, series, and simulation.
- Pi Approximation Explorer.
Compare polygon, Gregory, Nilakantha, and Monte Carlo approximations of pi with charts, errors, examples.
- Pi Algorithm Race.
Race Gregory, Nilakantha, Machin-like, and Chudnovsky pi algorithms with fixed-time and fixed-digits modes, charts.
- Pi Digits Generator.
Generate the first n digits of pi with a Chudnovsky-based browser tool.
- Pi Digit Lab.
Search for a digit sequence, jump to a position, move block by block, and copy a selected range inside the first n.
- Probability Simulator — coin, dice, roulette.
Simulate coin tosses, dice rolls and roulette spins with a fixed seed to compare theoretical and empirical.
- 2D geometry calculator – area & perimeter of shapes.
Compute area and perimeter for rectangles, circles, triangles, trapezoids, and regular polygons with formulas.
- 3D Geometry Calculator (Sphere, Cylinder, Cone, Prism).
Compute volume and surface area for spheres, cylinders, cones, rectangular and regular prisms—with example inputs.
- Algebra simplifier with colors for like terms.
Expand with distribution, color-match like terms, and simplify step by step.
- Algebra Worksheet Generator.
Create printable algebra handouts with answer keys and optional worked steps.
- ANOVA Calculator.
Paste grouped raw values to run a one-way ANOVA, inspect the ANOVA table, F statistic, p-value, eta-squared.
- Arithmetic & Geometric Sequence Calculator.
Compute the nth term, partial sum, common difference or ratio, and number of terms for arithmetic and geometric.
- ARR NNT Calculator.
Calculate absolute risk reduction, relative risk reduction, and NNT or NNH from control and experimental event rates.
- Aspect Ratio Calculator.
Simplify image or video ratios, solve a missing width or height, and preview contain, cover, and crop behavior.
- Attributable Fraction Exposed Calculator.
Estimate attributable fraction among exposed and attributable percent among exposed from group risk, or from direct.
- Attributable Risk Calculator.
Compare exposed and unexposed groups to review attributable risk and attributable fraction together.
- Attributable Risk Percent Calculator.
Estimate attributable risk percent from exposed and unexposed risk, or from a direct attributable risk.
- Balanced Accuracy Calculator.
Calculate balanced accuracy, recall, specificity, precision, prevalence, and accuracy from TP, FP, TN, and FN.
- Base Converter & Bitwise Toolkit (Bin/Oct/Dec/Hex).
Convert between binary, octal, decimal, and hexadecimal, and run AND/OR/XOR/NOT and bit shifts—then copy.
- Bayes Theorem Calculator.
Update a prior probability with Bayes' theorem.
- Bell numbers table with Stirling relations.
Generate a Bell numbers table B(n) and confirm the relation B(n)=ΣS(n,k).
- Beta Distribution Generator & Visualizer.
Generate random samples from a Beta distribution and visualize the PDF and histogram.
- Binomial Test Calculator.
Enter successes, trials, and a null proportion to read exact binomial-test p-values.
- Birthday paradox (collision probability) calculator.
Calculate the birthday paradox collision probability with exact math + a Monte Carlo simulator.
- Card deck shuffler – shuffle & draw cards.
Shuffle a deck of playing cards and draw or deal cards in your browser.
- Catalan number explorer - Dyck paths & trees.
Explore Catalan numbers C_n with exact BigInt or modulo tables, then enumerate or uniformly sample Dyck words, Dyck.
- Chi-Square Test Calculator.
Run chi-square goodness-of-fit and independence tests from observed counts.
- Circular & necklace permutation calculator.
Compute circular permutations (rotation counted as the same) and necklace/bracelet permutations (rotation + reflection.
- Cohen's Kappa Calculator.
Calculate Cohen's kappa from paired labels or a contingency table.
- Column arithmetic learning hub.
Choose the column-arithmetic page for carries, borrowing, whole-number division, or decimal-point moves in the order.
- Complex Number Calculator — a+bi ↔ polar with steps.
Convert between a+bi and r∠θ, perform complex addition, subtraction, multiplication, division, powers, and list n-th.
- Confidence Interval & Hypothesis Test Wizard.
Build confidence intervals and hypothesis tests for means and proportions with t/z workflows, Welch, paired, Wilson.
- Confusion Matrix Calculator.
Calculate confusion matrix metrics for binary classification from TP, FP, TN, and FN.
- Conic sections calculator – standard form & focus.
Classify a general quadratic, rotate to eliminate xy, complete the square to standard form, and visualize focus.
- Coordinate geometry calculator – distance & lines.
Compute distance, midpoint, slope, line equations, circles, and intersections with full working shown beside.
- Correlation Calculator.
Paste XY pairs to calculate Pearson or Spearman correlation, two-sided p-value, squared coefficient, sample count.
- Coupon Collector Calculator (Expected Draws & Completion).
Solve the coupon collector problem with expected draws n·H_n, completion probability P(T≤t), and t50/t90/t99.
- Data visualization: quick charts, CSV profiling, regression.
Quick charts, CSV column profiling, histograms, box plots, and regression.
- Deadline Countdown Calculator.
See remaining calendar days, business days, and business hours until a deadline in one page.
- Decimal Long Division.
Learn decimal long division by separating the decimal shift, the transformed equation, and the long-division steps.
- Decimal Long Division.
Learn decimal long division step by step.
- Decimal Long Multiplication.
Learn decimal long multiplication by separating the whole-number multiplication from the step where the decimal point.
- Descriptive Statistics + Box Plot & Histogram.
Paste a dataset or upload CSV/TSV to review descriptive statistics, histogram, box plot, outlier counts, trimmed mean.
- Diagnostic Odds Ratio Calculator.
Calculate diagnostic odds ratio from TP, FP, TN, and FN.
- Dice roller (d4 to d100, 2d6+3, PNG).
Roll d4 to d100 or use notation like 2d6+3.
- Dice stats (odds & distribution) + PNG sharing.
Compute odds and distributions for NdS +/- K.
- Differentiation Calculator (steps, tangents, numeric).
Compute symbolic and numeric derivatives for single-variable, parametric, implicit, and partial derivatives.
- Dirichlet Distribution Generator & Visualizer.
Generate probability vectors from a Dirichlet distribution and visualize marginals and simplex plots.
- Distributions — binomial, Poisson, t, chi square.
Compute PMF or PDF, CDF, quantiles, and exact intervals for binomial, Poisson, Student t, and chi-square.
- Effect Size Calculator.
Calculate Cohen's d, Hedges' g, or eta-squared from two-group summaries or one-way ANOVA summaries, then read.
- Eigenvalues & Eigenvectors (2x2, 3x3) — with steps.
Compute eigenvalues, eigenvectors, residuals, and multiplicities for 2x2 and 3x3 matrices with analytic.
- Entropy and KL Divergence Calculator.
Calculate entropy, cross-entropy, KL divergence, and JS divergence from probability vectors P and Q.
- Error Propagation Calculator with Steps.
Propagate uncertainty for sums, products, powers, and custom formulas with gradient×covariance steps, correlation.
- Expected Value Simulator.
Compare theoretical expected value, variance, and simulated averages for coin flips, dice, or simple lottery-style.
- F-Beta Score Calculator.
Calculate F-beta from precision and recall, or from TP, FP, and FN.
- Find calculators in your language.
Choose your language or search across all CalcBE locales.
- First-Order ODE Solver (Separable + Linear).
Solve separable and linear first-order ODEs with slope fields, integrating factors, Simpson integrals, numeric.
- Fisher Exact Test Calculator.
Enter one 2x2 table to read Fisher exact test p-values in two-sided, greater, or less form.
- Fraction calculator.
Enter mixed or improper fractions as-is, perform addition, subtraction, multiplication, or division, and instantly.
- Friedman Test Calculator.
Run a Friedman test for 3+ paired groups. Review Q, the p-value, tie correction, Kendall's W, and rank summaries.
- Function Transformations Calculator.
Graph function transformations from the parent graph.
- GCD & LCM calculator – greatest common divisor tool.
Compute the GCD and LCM for up to 32 integers using Euclid’s algorithm and successive reduction.
- GCD & LCM Calculator — step-by-step.
Compute GCD (greatest common divisor) and LCM (least common multiple) with steps Euclidean algorithm, ladder method.
- Geometry & Graph Tools: Triangles, Vectors, 2D/3D.
Solve triangles, work with vectors, and use graph helpers like graph paper and number lines.
- Histogram & cumulative frequency from grouped data.
Enter grouped or raw data to build a derived frequency table, histogram (frequency or frequency density).
- How to Do Long Multiplication.
Learn long multiplication with short, child-friendly steps.
- Hypergeometric probability calculator without replacement.
Calculate hypergeometric probabilities without replacement, including P(X=10) for N=60, K=35, n=15.
- Inclusion–Exclusion — at least one & none.
Compute.
- Inequality Solver for 1D & 2D.
Solve linear, compound, absolute value, quadratic, and rational inequalities with shareable steps, plus half-plane.
- Integer composition calculator - counts, k parts.
Calculate integer compositions where order matters. Get counts for 2^(n-1), exactly k parts, bounded parts.
- Integer Partition Calculator (p(n), exactly k parts).
Calculate integer partitions p(n) with options for exactly k parts, max part m, distinct parts, odd/even parts.
- Integration Calculator (numeric methods + steps).
Compute definite integrals with trapezoid, Simpson, adaptive, Gaussian, and Monte Carlo methods.
- Inverse proportion y=k/x explorer.
Explore y = k/x with synchronized formula, table, and graph.
- Kruskal-Wallis Test Calculator.
Run a Kruskal-Wallis test for 3+ independent groups. Review H, the p-value, tie correction, and rank summaries.
- LaTeX Equation Editor — Live MathJax, palette, templates.
An advanced LaTeX equation editor with live MathJax preview, caret-aware palette, templates, history, and one-tap.
- Likelihood Ratio Calculator.
Calculate positive and negative likelihood ratios from TP, FP, TN, and FN.
- Limits Explorer — one-sided limits and numeric L'Hôpital.
Check indeterminate forms, sample one-sided limits, apply numeric L'Hôpital steps, and view the graph near.
- Linear Equation Solver (Step by Step).
Linear equation solver that logs each same-operation step.
- Linear function y=ax+b explorer.
Explore y = ax + b with synchronized formula, table, and graph.
- Linear Regression & Correlation — Scatter, OLS/WLS, R².
Paste x,y[,w] data or upload a CSV to fit OLS, WLS or Theil–Sen regression.
- Linear systems solver – 2×2 and 3×3 equation systems.
Solve 2×2 and 3×3 systems of linear equations with Gaussian elimination (RREF), classify solutions, show parametric.
- Linear Systems Solver with RREF Steps (2×2 & 3×3).
Reduce 2×2 and 3×3 linear systems with Gaussian or Gauss-Jordan elimination, log every row operation, keep exact.
- Loan & Mortgage Calculators: Payment, Schedule.
Estimate payments, compare amortization schedules, and check affordability (DTI) with browser-only loan & mortgage.
- Log Laws Transformer (with steps) — expand, condense.
Expand, condense, and evaluate logarithms with shareable steps.
- Long addition & subtraction (decimal carry/borrow).
Follow column addition or subtraction with decimals, carries, and borrowing one place at a time.
- Long Division Calculator with Steps.
Calculate long division with steps.
- Long Multiplication With Steps.
Learn whole-number long multiplication by following partial products, shifted rows, and the final addition step.
- Lottery Odds Calculator.
Calculate jackpot odds, 1 in X probability, expected value, prize tiers, and multi-ticket chances for custom.
- Mann-Whitney U Test Calculator.
Compare two independent groups with a Mann-Whitney U test. Review exact or asymptotic p-values without assuming.
- Matrix Calculator — RREF / Solve Ax=b / Inverse.
Compute RREF, solve Ax=b, find the inverse, determinant, rank, null space, row and column spaces with detailed.
- MCC Calculator.
Calculate Matthews correlation coefficient (MCC), balanced accuracy, precision, recall, specificity, prevalence.
- McNemar Test Calculator.
Enter one paired 2x2 table to read exact and asymptotic McNemar test p-values.
- Mean and Standard Deviation Calculator.
Paste or type your dataset to compute count, mean, variance, and standard deviation (population N and sample N‑1).
- Modular arithmetic calculator – GCD, inverse & CRT.
Compute extended GCD, modular inverses, fast power, CRT and linear congruences with BigInt precision.
- Multiset permutation calculator.
Count distinct permutations when items repeat (anagram count) using n!/(n1!...nk!).
- nCr & nPr calculator (permutations & combinations).
Compute nCr (combinations), nPr (permutations), and factorial (n!).
- Normal Distribution Calculator.
Calculate normal probabilities, z-scores, percentiles, and inverse cutoffs from the mean and standard deviation.
- NPV & PPV Calculator.
Calculate PPV, NPV, sensitivity, specificity, and observed prevalence from TP, FP, TN, and FN, then test how PPV.
- Number Needed to Harm Calculator.
Convert absolute risk increase into number needed to harm and review control risk, exposed risk, and signed risk.
- Number Needed to Screen Calculator.
Convert screening detection yield into number needed to screen and review prevalence, detection rate, and yield.
- Odds Probability Converter.
Convert probability to odds or odds back to probability. Useful for Bayes updates, likelihood ratios.
- Odds Ratio Confidence Interval Calculator.
Enter a 2x2 table to read the odds ratio with a 90%, 95%, or 99% confidence interval.
- Odds Ratio from 2x2 Table Calculator.
Enter event and non-event counts for two groups to read each group odds and the odds ratio from one 2x2 table.
- Paint and Coating Calculators.
Estimate paint amount (L/gal), coverage, cans, exterior/roof/fence/deck areas, paint cost, and industrial.
- Paper & templates: graph paper, notes, worksheets.
Printable paper templates: graph paper, notes, worksheets, and planners.
- Partial fractions calculator – decomposing rational.
Decompose rational functions into partial fractions with polynomial long division, Durand-Kerner factorisation.
- Pascal's Triangle & Binomial Expansion (with steps).
Generate Pascal rows, combinations, and binomial expansions with BigInt accuracy.
- Password generator – strong secure random passwords.
Generate strong random passwords in your browser with crypto.getRandomValues.
- Pattern String Generator — business IDs & sequences.
Generate business-style IDs from a pattern (date, sequence, random).
- Permutation test – exact p-value for A/B and paired.
Run a permutation (randomization) test for two independent groups or paired samples.
- Poker odds calculator.
Calculate Texas Hold'em odds in one place: hand probabilities, outs hit rate, and equity versus random opponents.
- Population Attributable Fraction Calculator.
Estimate population attributable fraction and population attributable percent from exposure prevalence and group risk.
- Population Attributable Risk Calculator.
Estimate population attributable risk from exposure prevalence and attributable risk, or from exposed.
- Population Attributable Risk Percent Calculator.
Estimate population attributable risk percent from exposure prevalence with exposed and unexposed risk, or from direct.
- Post-Test Odds Calculator.
Start from pre-test probability or prior odds, apply a likelihood ratio, and review post-test odds and posterior.
- Power Analysis Calculator.
Plan required sample size, achieved power, or minimum detectable effect for one mean, two means, one proportion.
- Pre-Test Post-Test Probability Calculator.
Convert pre-test probability into post-test probability with LR+ or LR.
- Precision & Recall Calculator.
Calculate precision, recall, F1, specificity, prevalence, and accuracy from TP, FP, TN, and FN.
- Prime factorization calculator – exponents, divisors.
Factor any positive integer into primes, see exponents, divisor counts, the largest prime factor, and copy a shareable.
- Prime Factorization with Steps & Factor Tree.
Factor any integer into primes, see every trial division step, compute τ(n), σ(n), φ(n), and draw the factor tree.
- Print DPI Calculator.
Estimate effective PPI for a print size from image pixels.
- Probability & simulation tools.
Probability simulators and calculators for expected value, trees, combinatorics, distributions, and Monte Carlo.
- Probability tree & 2×2 table — AND/OR & complement.
Probability tree & 2×2 table tool for AND/OR/NOT and complements.
- Pythagorean theorem calculator.
Solve and visualize a²+b²=c² with a right-triangle diagram and area model.
- Random & Lotteries: Pickers, Dice, Probability.
Find the right random tool fast: weighted random picker, random picker, dice tools, plus probability calculators.
- Random CSV generator – test data & schema JSON.
Generate random CSV test data in your browser.
- Random Date Generator, Time Generator & Datetime Generator.
Generate random dates, random times, or random datetimes with ranges, weekday filters, exclusions, time windows.
- Random distributions: samplers, tests & visualizers.
Generate random samples from distributions, visualize histograms, and sanity-check randomness in your browser.
- Random JSON Generator (Test Data) — array & NDJSON.
Generate JSON test data from a schema. Export as JSON array or NDJSON.
- Random Log Generator — Nginx, Apache & JSON logs.
Generate fake access logs (Nginx/Apache) or JSONL logs with controllable distributions.
- Random number generator (integers, decimals, seed).
Generate random numbers in your browser: integers or decimals, optional seed, unique mode, and one-click copy.
- Random Picker.
Pick one or more random items from a list in your browser. Great for lotteries, giveaways, and classroom activities.
- Random SQL INSERT Generator — Postgres, MySQL, SQLite.
Generate SQL INSERT statements from a schema for Postgres, MySQL, or SQLite.
- Random test data generators (CSV, IDs, time).
Create CSV test data, random IDs, and timestamps locally in your browser.
- Random tools – generators, pickers, shuffles.
Random generators and pickers that run entirely in your browser: numbers, dates, CSV test data, tokens, UUIDs.
- Random Walk & Markov Chain Visualizer.
Run random walk (1D/2D/3D) and Markov chain simulations in your browser.
- Randomness beacon verifier – paste a beacon to verify.
Paste a public beacon value to verify a deterministic draw or shuffle.
- Randomness Tests (chi-square, runs, ACF, JB).
Run chi-square, runs, autocorrelation, and Jarque-Bera tests on bit or number sequences.
- Ratio Calculator & Proportion Solver with Steps.
Use a ratio calculator and proportion solver with steps.
- Real Estate (Mortgage/Amortization/Affordability).
Estimate mortgage payments, amortization schedules, and affordability (DTI) together.
- Relative Risk and Odds Ratio Calculator.
Enter event and non-event counts for two groups to compare relative risk, odds ratio, and absolute risk difference.
- Repetition calculator – n^r & nHr (multichoose).
Calculate repeated permutations n^r and multichoose values nHr with exact BigInt results or fast.
- Riemann Sums Calculator.
Visualise left/right, midpoint, trapezoid and Simpson sums for f(x), compare with an adaptive Simpson reference.
- Risk Difference Calculator.
Compare two event-rate groups and review signed risk difference, absolute difference, and each group risk together.
- Risk Difference Confidence Interval Calculator.
Enter one 2x2 table to read the risk difference with a 90%, 95%, or 99% confidence interval.
- Risk Ratio Confidence Interval Calculator.
Enter a 2x2 table to read the risk ratio with a 90%, 95%, or 99% confidence interval.
- Risk Ratio from 2x2 Table Calculator.
Enter event and non-event counts for two groups to read each group risk, the risk ratio, and the absolute risk.
- ROC AUC Calculator.
Calculate a binary ROC curve, AUC, and threshold table from pasted score,label rows.
- Roman Numeral Converter.
Convert integers to Roman numerals and Roman numerals back to numbers.
- Rounding & error bands.
Round any number, highlight the digit you inspect, and see the error band on a number line.
- Sample Size Calculator.
Plan sample size for surveys, means, and balanced A/B tests.
- Sampling & Bootstrap — CLT Explorer (with steps).
Simulate samples from common distributions, bootstrap means or proportions, and see CLT histograms with steps.
- Scientific calculator – trig, logs, powers and degree.
Run trig, logs, exponents, and factorials with Deg/Rad modes, keyboard input, memory, and a shareable URL that.
- Seating Chart Generator (Random) — Classroom & Tables.
Free online seating chart generator for classrooms and events.
- Sector arc length, area & angle calculator.
Solve a sector’s arc length l, area A, central angle θ, or radius r with units and a live diagram.
- Sensitivity and Specificity Calculator.
Calculate sensitivity, specificity, false positive rate, false negative rate, balanced accuracy, and prevalence.
- Sequences & Series (Arithmetic / Geometric) — terms.
Compute arithmetic and geometric sequences with steps logs: nth terms, partial sums, solving for n or k, two-point.
- Shuffle bias comparison – naive vs Fisher–Yates.
Compare shuffle bias: naive swap-everywhere vs Fisher–Yates (and optional sort(() => random - 0.5)).
- Sign Test Calculator.
Run an exact sign test on paired before/after values.
- Signed number line calculator & sign rules.
Add, subtract, multiply, and divide signed numbers with a number-line animation for plus/minus moves.
- Similarity ratio calculator – side, area, volume.
Enter a similarity ratio (small:large) to see side/perimeter, area (square), and volume (cube) ratios with scale.
- Simultaneous Equations Solver (steps + graph).
Solve two linear equations with elimination, substitution, and graph views.
- Square root simplifier with factor tree & steps.
Simplify square roots to a√b with factor tree, pairing highlights, and steps.
- Standard calculator (history tape & memory).
Perform four‑function math with parentheses and percent, a running tape, and memory slots—fully keyboard accessible.
- Stars and Bars Calculator.
Use the stars and bars method to count combinations with repetition.
- Statistics (inference & tests).
Inference tools for confidence intervals, hypothesis tests, regression, and uncertainty.
- Statistics & Probability (overview): Inference.
Overview hub for statistics & probability.
- Stirling numbers table (first & second kind).
Generate Stirling numbers of the first and second kind, plus Bell numbers, with fast table output, recurrence details.
- Streak Probability Simulator.
Estimate the chance of consecutive wins or losses, expected streak starts, and likely longest streaks in one.
- Study & Classroom Tools: Worksheets, Graph Paper, GPA.
Classroom-ready tools: worksheet generator, graph paper, quick charts, plus GPA and stats calculators.
- Surface & volume nets.
Compute surface area and volume for prisms, pyramids, cylinders, cones, and spheres with net diagrams, face.
- Synthetic Time Series Generator — trend, seasonality.
Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers.
- T-Test Calculator.
Run one-sample, two-sample, and paired t-tests from summary statistics or pasted raw data.
- Tax Calculators: VAT, GST, Income Tax, Net ↔ Gross.
Quick tax calculators for VAT/GST, net↔gross conversions, and income tax.
- Taylor & Maclaurin Series — with steps and graphs.
Build Taylor and Maclaurin polynomials P_n(x) with symbolic derivatives or fallback fits, then compare f and P_n.
- Team generator – random teams & groups.
Split a list of names into random teams or groups in your browser.
- Topic hubs for calculators and tools.
Choose a task first, then open the topic hub that narrows calculators and tools for money, study, time, conversion.
- Triangle Solver (SSS / SAS / ASA, Area & Circumradius).
Select SSS, SAS, or ASA inputs and compute the remaining sides, angles, area, and triangle diagram.
- Triangle Solver (SSS, SAS, ASA, SSA) with steps.
Solve a triangle from sides and angles with SSS, SAS, ASA/AAS, or SSA.
- Triangular Distribution Generator (min/mode/max).
Generate samples from a triangular distribution using min/mode/max and visualize the PDF and histogram.
- TRPG dice check (d20/d100, pools) with PNG sharing.
Run d20/d100 checks with advantage/disadvantage, compare vs DC, and roll dice pools to count successes.
- Truncated Normal Generator & Visualizer.
Generate samples from a truncated normal distribution with lower/upper bounds and visualize the PDF/CDF and histogram.
- Truth Table & Logic Evaluator — DNF/CNF Simplifier.
Build Boolean truth tables up to 10 variables, export canonical DNF/CNF, simplify with Karnaugh or Quine–McCluskey.
- Unit Circle & Trig Explorer — amplitude, period & phase.
Explore y = A·f(bx+φ)+D for sine, cosine, and tangent.
- Vector Calculator — dot/cross, projection, angle, area.
Compute norms, dot, cross (2D/3D), projection, angle, areas, and triple product with steps logs.
- Verifiable random draw (commit-reveal) – auditable.
Run a verifiable random draw with commit-reveal logs so participants can verify every draw.
- Weibull Distribution Generator & Visualizer.
Generate random samples from a Weibull distribution and visualize the PDF and histogram.
- Weighted Random Picker & Randomizer.
Use this weighted random picker and randomizer to draw winners by weight, ratio, or raffle entries.
- Wilcoxon Signed-Rank Test Calculator.
Enter paired before and after values to run a Wilcoxon signed-rank test.
- Word Problem Wizard — percent, ratio, speed.
Solve common word problems by selecting a template, entering values with units, and getting equations and simple.
- Youden’s J Calculator.
Calculate Youden’s J from TP, FP, TN, and FN.
FAQ
Which math or statistics calculator should I open first?
Start from the result you need: percentage, equation solving, graphing, probability, descriptive statistics, or a table. The directory links are grouped so you can move from a broad topic to a specific calculator.
When should I use a statistics page instead of a general calculator?
Use a statistics page when the input is a dataset, frequency table, probability model, confidence interval, or hypothesis test. Use a general math calculator for algebraic expressions, geometry, or unit-style numeric work.
Are these pages suitable for homework checks?
Yes, they are useful for checking arithmetic, formulas, and steps. Still compare the displayed method with your class notation because teachers may require a specific rounding or explanation style.
How should I compare results across calculators?
Keep the same data, units, rounding, and sample-versus-population convention. Differences often come from using sample standard deviation in one place and population standard deviation in another.
Do the calculators upload my data?
Core calculations run in the browser. Share links can include parameters only when you choose to copy or share a URL.
Choosing a math or statistics tool
Start from the task
For algebra, choose a solver or simplifier. For geometry, choose a shape or coordinate calculator. For statistics, choose the page that matches the data structure and inference question.
Check conventions
Math and statistics pages may use different rounding, exact forms, sample/population conventions, or interval definitions. Read the result labels before copying an answer.
Use step pages for learning
Pages with step logs are best for classroom checks because they show substitutions and formulas. Directory pages are best when you are still choosing the right workflow.
Common mistakes
Do not paste a table into a single-value calculator. Do not compare probability, frequency, and percentage outputs without confirming the denominator.
Next move
If the directory feels too broad, open the closest topic hub first, then move to the calculator with the exact input fields you need.