Math Calculators
Keypads, percentages, fractions, ratios, stats, and probability.
45 free calculators in this category — all run in your browser.
Basic CalculatorA fast everyday calculator with live results and full keyboard support.Scientific CalculatorTrig, logs, roots, powers, factorials, π and e — with degrees or radians.Percentage CalculatorFind X% of a number, what percent one number is of another, or the percent change.Fraction CalculatorAdd, subtract, multiply, and divide fractions with simplified and mixed results.Ratio CalculatorSimplify a ratio, split it into percentages, and solve for a scaled value.Average CalculatorMean, median, mode, sum, min, max, and range for any list of numbers.Probability CalculatorChance of outcomes, dice rolls, or exact binomial successes — shown as percent and odds.Random Number GeneratorGenerate one or more random integers within an inclusive range, with an optional uniqueness rule.Standard Deviation CalculatorCalculate sample or population standard deviation and variance from a data set.Statistics CalculatorCompute mean, median, modes, range, variance, and common data-set measures.Number Sequence CalculatorGenerate arithmetic or geometric sequences and calculate their sums.Sample Size CalculatorEstimate a survey sample size from confidence, margin of error, and population.Z-Score CalculatorStandardize a data point and estimate its normal-distribution tail probabilities.Confidence Interval CalculatorCalculate a normal-approximation confidence interval for a sample mean.P-Value CalculatorConvert a Z statistic to a left-, right-, or two-tailed normal p-value.Greatest Common Factor CalculatorFind the greatest common factor and least common multiple of two integers.Least Common Multiple CalculatorFind the least common multiple and greatest common factor of two integers.Prime Number CalculatorCheck whether an integer is prime and find nearby prime numbers.Prime Factorization CalculatorBreak an integer into prime factors and list its positive divisors.Factor CalculatorList all positive factors of a whole number.Rounding CalculatorRound numbers to a chosen number of decimal places using common rounding methods.Exponent CalculatorRaise any real number to a chosen power and inspect scientific notation.Root CalculatorCalculate square, cube, or nth roots of positive and negative real numbers.Log CalculatorCalculate logarithms in base 10, base 2, natural log, or a custom base.Permutation and Combination CalculatorCalculate arrangements where order matters or selections where it does not.Quadratic Formula CalculatorSolve ax² + bx + c = 0 and find the discriminant, roots, and vertex.Slope CalculatorFind line slope, equation, distance, and midpoint from two coordinate points.Distance CalculatorCalculate Euclidean distance and midpoint between two 2D coordinates.Triangle CalculatorSolve a triangle from three side lengths, including angles, perimeter, and area.Circle CalculatorFind a circle's radius, diameter, area, and circumference from one known value.Right Triangle CalculatorSolve the hypotenuse, acute angles, area, and perimeter from two legs.Surface Area CalculatorCalculate surface area and volume for a box, cylinder, sphere, or cube.Percent Error CalculatorCompare an observed value to an accepted value and calculate percent error.Binary CalculatorPerform arithmetic and bitwise operations on binary integers.Hex CalculatorPerform arithmetic and bitwise operations on hexadecimal integers.Scientific Notation CalculatorConvert a number into normalized scientific notation and inspect its magnitude.Big Number CalculatorAdd, subtract, multiply, and divide integers beyond JavaScript's safe-number range.Long Division CalculatorDivide two values and display the quotient, integer remainder, and check.Half-Life CalculatorEstimate how much of a quantity remains after a specified number of half-lives.Modulo CalculatorFind the remainder after division and inspect the quotient identity.Matrix CalculatorAdd, subtract, multiply, invert, and find the determinant of 2 × 2 matrices.Factorial CalculatorCalculate n! for whole numbers from 0 through 170.Equation SolverSolve a linear equation in one variable and check the result by substitution.Common Factor CalculatorFind the greatest common factor and list common factors across multiple integers.Mean, Median, Mode & Range CalculatorCalculate common descriptive statistics from a list of numbers.