Category
Math & Statistics
Calculators for algebra, geometry, number theory and statistics: solve quadratic and polynomial equations, work with fractions and matrices, solve any triangle, and run t-tests, ANOVA, chi-square and regression on your own data. Results come with what you need to check them — exact fractions, the discriminant, residuals, degrees of freedom and p-values — rather than a bare number. Everything is computed in your browser, so the data you paste is never uploaded.
Prime Factorization · GCD · LCM
Factor an integer into primes, list all divisors, and compute GCD and LCM of two numbers. Handles values up to ~10¹².
Math & Statistics
Combinations & Permutations Calculator
Compute nCr and nPr, with and without repetition, plus factorials — exact arbitrary-precision integers for probability, lottery odds and combinatorics.
Math & Statistics
Right Triangle Calculator
Solve a right triangle from any two sides — get the third side, both acute angles, area and perimeter using the Pythagorean theorem.
Math & Statistics
Slope & Line Calculator
From two points, get the slope, the line equation y = mx + b, the distance, midpoint, angle of inclination, and rise/run.
Math & Statistics
Rule of Three Calculator
Solve a proportion a/b = c/d — enter any three values, leave one field empty, and the fourth is found by cross-multiplication.
Math & Statistics
Quadratic Equation Solver
Solve ax² + bx + c = 0 with the quadratic formula — real or complex roots, plus discriminant, vertex, axis of symmetry and sum/product of roots.
Math & Statistics
Math Expression Evaluator
Evaluate arithmetic expressions with the usual math functions — sqrt, sin, log, pow, min/max, and constants pi, e, tau.
Math & Statistics
Fraction Calculator — Add, Subtract, Multiply, Divide
Add, subtract, multiply, and divide fractions, mixed numbers, and decimals. Get the reduced fraction, mixed number, decimal, and worked steps.
Math & Statistics
Descriptive Statistics Calculator
Paste any list of numbers and instantly get count, mean, median, mode, standard deviation, quartiles, IQR, and more — all computed in your browser.
Math & Statistics
Specialized tools16
Tools for narrower, more technical jobs: particular file formats, standards and professional fields. They work like every other tool here, entirely in your browser.
Collatz Conjecture (3n+1) Sequence
Generate the Collatz sequence for any positive integer — halve when even, triple-plus-one when odd — with step count, peak value and the full path to 1.
Math & Statistics
Fibonacci Sequence Generator
Generate the first N Fibonacci numbers with exact big-integer precision — with the last term, the running sum and the golden-ratio approximation.
Math & Statistics
Modular Exponentiation Calculator (aᵇ mod m)
Compute a^b mod m exactly for arbitrarily large integers using fast binary exponentiation, plus the modular multiplicative inverse of the base.
Math & Statistics
Triangle Solver: SSS, SAS, ASA, AAS & SSA
Solve any triangle from three known sides and angles — SSS, SAS, ASA, AAS or the ambiguous SSA case — with area, perimeter, radii, heights and medians.
Math & Statistics
Circle Calculator
Enter any one of radius, diameter, circumference or area, and instantly get the other three — with the formulas shown.
Math & Statistics
Matrix Calculator (exact fractions)
Determinant, inverse, RREF and rank, transpose, product and A x = b for matrices up to 12 × 12, in exact fractions rather than rounded decimals.
Math & Statistics
Polynomial Root Finder (Cubic, Quartic & Beyond)
Find all real and complex roots of a polynomial up to degree 30 — cubic, quartic or higher — with multiplicities, the factored form and a residual check.
Math & Statistics
Definite Integral Calculator (Numerical)
Evaluate a definite integral numerically to about 13 digits — finite or infinite limits, endpoint singularities like 1/√x — with error estimate and plot.
Math & Statistics
A/B Test Calculator (significance & sample size)
Compare two conversion rates: p-value, lift, Wilson and Newcombe intervals, a sample-ratio-mismatch check, and the sample size the next test needs.
Math & Statistics
Probability Distribution Calculator
Probabilities and quantiles for the normal, t, chi-square, F, exponential, binomial and Poisson distributions, accurate far into the tails.
Math & Statistics
t-Test Calculator (paired, Welch, one-sample)
One-sample, paired and two-sample t-tests from raw data or summary statistics: t, degrees of freedom, p-value, confidence interval and Cohen's d.
Math & Statistics
Mann–Whitney U & Wilcoxon Signed-Rank Test
Rank-based tests for two independent samples or paired data: W or V, an exact or corrected p-value, rank-biserial r and the Hodges–Lehmann estimate.
Math & Statistics
One-Way ANOVA Calculator (Welch, Kruskal–Wallis)
Compare the means of several groups: one-way ANOVA, Welch's ANOVA, Kruskal–Wallis and Levene's test, with the ANOVA table and effect sizes.
Math & Statistics
Chi-Square Test Calculator (with Fisher's exact)
Chi-square test of independence or goodness of fit: χ², df, p-value, expected counts, residuals, Cramér's V, and Fisher's exact test for 2 × 2 tables.
Math & Statistics
Pearson, Spearman & Kendall Correlation
Pearson's r with a p-value and Fisher-z interval, Spearman's ρ and Kendall's τ-b from pasted pairs — with a warning when values and ranks disagree.
Math & Statistics
Linear Regression Calculator
Paste (x, y) pairs and instantly get the best-fit line — slope, intercept, Pearson r, R², and a live prediction — all computed in your browser.
Math & Statistics