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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 | Polygons, series, Monte Carlo.
Compare polygon, Gregory, Nilakantha, and Monte Carlo approximations of pi with charts, errors, examples.
- Pi Algorithm Race | Compare Gregory, Nilakantha, Machin,.
Race Gregory, Nilakantha, Machin-like, and Chudnovsky pi algorithms with fixed-time and fixed-digits modes, charts.
- Pi Digits Generator | First n digits with Chudnovsky.
Generate the first n digits of pi with a Chudnovsky-based browser tool.
- Pi Digit Lab | Search and jump within the first n digits of pi.
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 from side lengths.
- 3D Geometry Calculator (Sphere, Cylinder, Cone, Prism).
Compute volume and surface area for spheres, cylinders, cones, rectangular and regular prisms—with example inputs.
- About CalcBE | Mission, Quality Policy & Sources.
Learn who runs CalcBE, how calculator quality is reviewed, how formulas and sources are chosen, and where professional.
- 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 | One-Way F-Test from Grouped Data.
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 | Absolute risk reduction, RRR, NNT, NNH.
Calculate absolute risk reduction, relative risk reduction, and NNT or NNH from control and experimental event rates.
- Assay standard curves guide.
Use this guide to choose blank handling, fit models, range checks, and reporting details for protein assay and ELISA.
- Attributable Fraction Among Exposed Calculator.
Estimate attributable fraction among exposed and attributable percent among exposed from group risk, or from direct.
- Attributable Risk Calculator | Exposed vs unexposed risk gap.
Compare exposed and unexposed groups to review attributable risk and attributable fraction together.
- Attributable Risk Percent Calculator | Fraction of.
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 | Prior, Posterior & Bayes Factor.
Update a prior probability with Bayes' theorem.
- Beer-Lambert law guide | Calibration curves, absorbance,.
Learn when to use the Beer-Lambert law, how to read calibration curves, when to force the fit through the origin.
- 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 | Exact p-value for one proportion.
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.
- Bonds & Rates Calculators (YTM, Duration, DV01).
Compare calculators for bond price, yield to maturity, duration, DV01, and rate conversion in one place.
- 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 | Goodness-of-Fit & Independence.
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 | Inter-Rater Agreement.
Calculate Cohen's kappa from paired labels or a contingency table.
- Column arithmetic learning hub | Add, subtract, multiply,.
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 | Precision, Recall, F1 &.
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 | Pearson & Spearman from XY Data.
Paste XY pairs to calculate Pearson or Spearman correlation, two-sided p-value, squared coefficient, sample count.
- Coupon Collector Calculator (Expected Draws, t90,.
Solve the coupon collector problem with expected draws n·H_n, completion probability P(T≤t), and t50/t90/t99.
- Data Transfer Time Calculator (Size, Speed, Time).
Calculate transfer time, required speed, or transferable data size with bit/byte and SI/IEC unit conversion plus.
- Data visualization: quick charts, histograms, regression.
Charts and summaries: quick charts, histograms, box plots, and regression.
- Decimal Long Division | Move the Decimal Point and Solve.
Learn decimal long division by separating the decimal shift, the transformed equation, and the long-division steps.
- Decimal Long Division | Move the Decimal Point Step by Step.
Learn decimal long division step by step.
- Decimal Long Multiplication | Put the Decimal Point Back.
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.
- Dev & data tools: JSON, UUID, subnet/CIDR, random CSV.
Developer utilities: JSON formatting, UUIDs, subnet/CIDR, random CSV test data, and text tools. Browser-only, no.
- Diagnostic Odds Ratio Calculator | DOR from TP, FP, TN, FN.
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 | Cohen's d, Hedges' g & Eta-Squared.
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 & 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.
- F-Beta Score Calculator.
Calculate F-beta from precision and recall, or from TP, FP, and FN.
- Find calculators in your language | Search across locales.
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 | Exact p-value for a 2x2 table.
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 | Paired rank-based 3+ group p-value.
Run a Friedman test on 3 or more paired groups.
- 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. Browser-only geometry.
- 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 | Step by Step for Learners.
Learn long multiplication with short, child-friendly steps.
- Hypergeometric probability calculator without replacement.
Calculate exact probability, cumulative tails, and ranges for hypergeometric draws without replacement.
- Inclusion–Exclusion — at least one & none.
Compute |A∪B∪…| (“at least one”) for 2–4 sets. For 2–3 sets you can input Venn regions (easy) or intersection sizes.
- 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 | signs & k.
Explore y = k/x with synchronized formula, table, and graph.
- Investing & Wealth Building (NISA/SIP/Compound/Retirement).
Compare long-term investing scenarios for NISA, SIP, compound growth, retirement, and savings goals.
- Kruskal-Wallis Test Calculator | Rank-based 3+ group p-value.
Run a Kruskal-Wallis test on 3 or more independent groups.
- LaTeX Equation Editor — Live MathJax, palette, templates.
A premium LaTeX equation editor with live MathJax preview, caret-aware palette, templates, history, and one-tap.
- Likelihood Ratio Calculator | LR+ / LR- from Sensitivity &.
Calculate positive and negative likelihood ratios from TP, FP, TN, and FN.
- Limits Explorer — one-sided limits and numeric LHopital.
Check indeterminate forms, sample one-sided limits, apply numeric LHopital 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 | formula & graph.
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 | Quotient, Remainder & Steps.
Solve long division online and show every quotient digit, subtraction, and bring-down step.
- Long Multiplication With Steps | Carries and Partial Products.
Learn whole-number long multiplication by following partial products, shifted rows, and the final addition step.
- Lottery Odds Calculator | Jackpot Chance, 1 in X, EV &.
Calculate lottery odds, jackpot probability, 1 in X, expected value, and multi-ticket win chances.
- Mann-Whitney U Test Calculator | Independent nonparametric.
Enter two independent groups to run a Mann-Whitney U test.
- 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 | Paired 2x2 exact and asymptotic.
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 | z-Score, Percentile & CDF.
Calculate normal probabilities, z-scores, percentiles, and inverse cutoffs from the mean and standard deviation.
- NPV & PPV Calculator | Predictive Values and Prevalence Shift.
Calculate PPV, NPV, sensitivity, specificity, and observed prevalence from TP, FP, TN, and FN, then test how PPV.
- Number Needed to Harm Calculator | Absolute risk increase.
Convert absolute risk increase into number needed to harm and review control risk, exposed risk, and signed risk.
- Number Needed to Screen Calculator | Detection yield to NNS.
Convert screening detection yield into number needed to screen and review prevalence, detection rate, and yield.
- Odds Probability Converter | Probability to odds and back.
Convert probability to odds or odds back to probability. Useful for Bayes updates, likelihood ratios.
- Odds Ratio Confidence Interval Calculator | 2x2 table OR.
Enter a 2x2 table to read the odds ratio with a 90%, 95%, or 99% confidence interval.
- Odds Ratio from 2x2 Table Calculator | Quick OR from counts.
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 probability, outs hit rate, and equity versus random opponents, using.
- 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 | Prior odds, LR update,.
Start from pre-test probability or prior odds, apply a likelihood ratio, and review post-test odds and posterior.
- Power Analysis Calculator | Sample Size, Power & MDE.
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 | F1, Specificity & Prevalence.
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.
- Probability & simulation tools.
Probability simulators and calculators for trees, combinatorics, distributions, and Monte Carlo intuition.
- Probability tree & 2×2 table — AND/OR & complement.
Probability tree & 2×2 table tool for AND/OR/NOT and complements.
- Pythagorean theorem calculator | Diagram & area model.
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 | Draw winners without repeats.
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. No uploads; share settings-only URLs.
- 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 & Proportion Solver — Steps + Percent.
Simplify ratios, solve proportions, and convert percentages with steps working. Teacher mode, LaTeX export.
- Real Estate (Mortgage/Amortization/Affordability).
Estimate mortgage payments, amortization schedules, and affordability (DTI) together. Compare assumptions and save.
- Relative Risk and Odds Ratio Calculator | Compare two 2x2.
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 permutations with repetition (n^r) and combinations with repetition (nHr = C(n+r-1,r)) with Exact BigInt.
- Riemann Sums Calculator | Left/Right/Trapezoid/Simpson.
Visualise left/right, midpoint, trapezoid and Simpson sums for f(x), compare with an adaptive Simpson reference.
- Risk Difference Calculator | Signed and absolute risk gap.
Compare two event-rate groups and review signed risk difference, absolute difference, and each group risk together.
- Risk Difference Confidence Interval Calculator | 2x2 table.
Enter one 2x2 table to read the risk difference with a 90%, 95%, or 99% confidence interval.
- Risk Ratio Confidence Interval Calculator | 2x2 table RR.
Enter a 2x2 table to read the risk ratio with a 90%, 95%, or 99% confidence interval.
- Risk Ratio from 2x2 Table Calculator | Quick relative risk.
Enter event and non-event counts for two groups to read each group risk, the risk ratio, and the absolute risk.
- ROC AUC Calculator | ROC Curve, AUC & Threshold Table.
Calculate a binary ROC curve, AUC, and threshold table from pasted score,label rows.
- Rounding & error bands | Intermediate vs final.
Round any number, highlight the digit you inspect, and see the error band on a number line.
- Sample Size Calculator | Surveys, Means & A/B Tests.
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 & 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 | Exact paired direction p-value.
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 | Combinations With Repetition.
Use the stars and bars method to count combinations with repetition. Solve x1 +.
- Statistics (inference & tests).
Inference tools for confidence intervals, hypothesis tests, regression, and uncertainty. Browser-only, no sign-in.
- 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.
- Study & Classroom Tools: Worksheets, Graph Paper, GPA.
Classroom-ready tools: worksheet generator, graph paper, quick charts, plus GPA and stats calculators. Browser-only.
- Surface & volume nets.
Compute surface area and volume for prisms, pyramids, cylinders, cones, and spheres with synced 3D sketches and nets.
- Synthetic Time Series Generator — trend, seasonality.
Generate synthetic time series data with trend, seasonality, noise, missing values, and outliers.
- T-Test Calculator | One-Sample, Two-Sample & Paired.
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. Browser-only, no sign-up.
- 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 | Find by task.
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 the known combination (three sides, two sides plus the included angle, or two angles plus the included side).
- 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, syncing the unit circle and graph as you change amplitude.
- 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 a commit-reveal workflow, public seeds, and reproducible logs so participants can.
- Weibull Distribution Generator & Visualizer.
Generate random samples from a Weibull distribution and visualize the PDF and histogram.
- Weighted Random Picker & Randomizer | Seeded Weighted Draws.
Use this weighted random picker and randomizer to draw winners by weight, ratio, or raffle entries.
- Wilcoxon Signed-Rank Test Calculator | Paired.
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, diagrams.
- Youden’s J Calculator | Sensitivity + Specificity - 1.
Calculate Youden’s J from TP, FP, TN, and FN.
FAQ
What should I do first on this page?
Start with the minimum required inputs or the first action shown near the primary button. Keep optional settings at defaults for a baseline run, then change one setting at a time so you can explain what caused each output change.
Why does this page differ from another tool?
Different pages often use different defaults, units, rounding rules, or assumptions. Align those settings before comparing outputs. If differences remain, compare each intermediate step rather than only the final number.
How reliable are the displayed values?
Values are computed in the browser and rounded for display. They are good for planning and educational checks, but for regulated or high-stakes decisions you should validate assumptions with official guidance or professional review.
Can I share and reproduce this result?
Yes. Use the share or URL controls when available. Keep a baseline case and one changed case so others can reproduce your reasoning and verify that the direction and scale of change are consistent.
Is my input uploaded somewhere?
Core calculations run locally in your browser. Some pages encode parameters in a shareable URL, but no automatic upload is performed unless you explicitly share that link.
How to use Math & statistics calculators effectively
What this calculator does
This page is for estimating outcomes by changing inputs in one controlled workflow. The model keeps your focus on variables, not output shape. Start with stable assumptions, then test sensitivity by changing one key input at a time to observe directional impact.
Input meaning and unit policy
Each input has an expected unit and a typical range. For reliable interpretation, check whether you are using the same unit system, period, and base assumptions across all runs. Unit mismatch is the most common source of unexpected drift in numeric results.
Use-case sequence
A practical sequence is: first run with defaults, then create a baseline log, then run one alternative scenario, and finally compare only the changed output metric. This sequence reduces cognitive load and prevents false pattern recognition in early experiments.
Common mistakes to avoid
Avoid changing too many variables at once, mixing incompatible data sources, and interpreting a one-time output without checking robustness. A single contradictory input can flip conclusions, so keep each experiment minimal and document assumptions as part of your note.
Interpretation guidance
Review both magnitude and direction. Direction tells you whether a strategy moves outcomes in the desired direction, while magnitude helps you judge practicality. If both agree, you can proceed; if not, rebuild the baseline and verify constraints before deciding.
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