Math Calculators

66 free online calculators — instant results, no sign-up

HOTBasic CalculatorAdd, subtract, multiply, divide with full keyboard support HOTScientific CalculatorTrig, log, exponent, factorial · DEG/RAD modes HOTPercentage CalculatorPercent of, percentage share, and percent change Fraction CalculatorAdd, subtract, multiply, divide fractions with simplification HOTNumber Base ConverterConvert between binary, octal, decimal and hexadecimal Permutation & Combination CalculatorPermutations A(n,m) and combinations C(n,m)Random Number GeneratorCustom range, integers or decimals, batch generation Prime Number ToolsPrimality test, prime factorization and prime lists GCD & LCM CalculatorGreatest common divisor and least common multiple NEWSequence CalculatorArithmetic & geometric sequences, sums and nth term NEWEquation SolverLinear and quadratic equations with real solutions NEWSquare Root Calculator√x — real square roots with precision NEWCube Root Calculator∛x — real cube roots NEWAbsolute Value Calculator|x| — absolute value of any number NEWLogarithm Calculatorlog, ln and log with any base NEWExponent Calculatorx^y — any base raised to any power NEWFactorial Calculatorn! — factorials including large numbers NEWModulo Calculatora mod b — remainder of division Statistics CalculatorMean, median, mode, variance, standard deviation and quartiles Ratio CalculatorSolve A:B=C:D, simplify ratios and allocate proportionally Matrix CalculatorDeterminant, inverse, transpose and matrix multiplication Triangle SolverSolve sides and angles (SSS/SAS) with law of cosines Weighted Average CalculatorValues and weights to weighted mean with normalization Slope CalculatorSlope, intercept, distance and midpoint from two points Complex Number CalculatorComplex arithmetic, modulus, argument and conjugate Probability CalculatorClassical, hypergeometric and at-least-once probability Trigonometry Calculatorsin/cos/tan values, inverse trig and special angles Vector Calculator3D vector add/subtract, dot & cross product, magnitude, angle Normal Distribution CalculatorZ-score, percentile and probability between values System of Equations SolverTwo-variable linear system solved by Cramer's rule Confidence Interval CalculatorMean CI at 90/95/99% with margin of error Mean Median Mode CalculatorCentral tendency trio with sorted comparison Percent Error CalculatorMeasured vs true value — experimental error Rounding CalculatorAny precision, round-half-to-even and truncation Percentage Change CalculatorIncrease/decrease percent and reverse calculation Nth Root CalculatorAny-degree root of any number Quadratic Equation SolverDiscriminant, real/complex roots and vertex Z-Score CalculatorStandardization, percentile and normal probability Distance Between Points Calculator2D/3D Euclidean and Manhattan distance Significant Figures CalculatorCount sig figs, round, apply +−×÷ rules Scientific Notation Convertera×10^n, engineering notation, E-notation Linear Regression CalculatorLeast squares fit, scatter plot, r² Geometric & Harmonic MeanAM-GM-HM inequality, growth rates Fibonacci CalculatorNth term with BigInt, golden ratio convergence Modular ExponentiationFast power a^b mod m, BigInt, cycles IQR & Quartile CalculatorQ1/Q2/Q3, IQR, outlier fences Margin of Error CalculatorConfidence interval & sample size Bayes Theorem CalculatorPosterior probability, medical screening Expected Value CalculatorE(X), variance, standard deviation Kelly Criterion CalculatorOptimal bet size, half Kelly Standard Deviation CalculatorPopulation/sample SD, variance, CV, SEM Decimal to Fraction CalculatorRepeating decimals + continued fractions Factoring CalculatorGCF · cross method · perfect square Exponential Growth CalculatorN0(1+r)^t · doubling & half-life Binomial Expansion Calculator(a+b)^n coefficients · Pascal triangle Inequality SolverLinear + quadratic · solution set · steps Long Division CalculatorQuotient & remainder · step-by-step work Correlation CalculatorPearson r · R² · significance t-test Poisson Distribution CalculatorP(X=k) · cumulative · full table Chi-Square Test Calculator2x2 table · p-value · Yates correction Sample Size Calculatorn vs margin of error · finite population Function Graph PlotterPlot any f(x) · zeros & intercepts marked Summation (Σ) CalculatorSum any expression term by term · partial sums · closed forms Math Worksheet GeneratorPrintable drills by level · answer key · seed replay Synthetic Division CalculatorSynthetic & long division · remainder theorem · rational roots Work Together CalculatorCombined work time · head start · fill & drain pipes · back-solve