Math
Math calculators
Algebra, statistics, geometry and everyday arithmetic.
Arithmetic & Number Theory
Percentages, fractions, exponents, factors, primes, bases and rounding.
Algebra & Geometry
Quadratics, slope, area, volume, triangles, distance and matrices.
Statistics & Probability
Mean, standard deviation, z-scores, sample size, p-values and sequences.
General Math
A full scientific calculator for expressions, functions and constants.
All math calculators
Basic CalculatorA simple online calculator with buttons — add, subtract, multiply and divide.Average CalculatorMean, sum and count of a list of numbers.Percentage CalculatorFind a percent of a number, a ratio as a percent, or a percentage change.Percent Error CalculatorCompare a measured value against the true value as a percent error.Fraction CalculatorAdd, subtract, multiply or divide two fractions and reduce the result.Exponent CalculatorRaise a base to a power, including negative and fractional exponents.Logarithm CalculatorLog of a number in any base, plus natural log and log base 10.Root CalculatorSquare root, cube root or any nth root of a number.Rounding CalculatorRound a number to a chosen number of decimal places or nearest unit.Scientific Notation CalculatorConvert a number to and from scientific (standard form) notation.Prime Factorization CalculatorBreak a number into its prime factors.GCF CalculatorGreatest common factor (HCF) of two or more numbers.LCM CalculatorLeast common multiple of two or more numbers.Factor CalculatorList all factors (divisors) of a number.Common Factor CalculatorFind every factor shared by two numbers.Big Number CalculatorExact arithmetic on very large integers, beyond normal precision.Long Division CalculatorDivide and get the quotient, remainder and decimal result.Binary CalculatorAdd, subtract or multiply binary numbers, or convert to decimal.Hex CalculatorHexadecimal arithmetic and conversion to and from decimal.Random Number GeneratorGenerate random integers in a range; change the seed to reroll.Ratio CalculatorSimplify a ratio and solve proportions (A:B = C:?).Half-Life CalculatorRemaining quantity after decay, given a half-life and elapsed time.Quadratic Formula CalculatorSolve ax² + bx + c = 0, including complex roots.Slope CalculatorSlope, angle and line equation from two points.Area CalculatorArea of common 2-D shapes — rectangle, triangle, circle, trapezoid and more.Volume CalculatorVolume of a box, sphere, cylinder, cone or pyramid.Surface Area CalculatorSurface area of a box, sphere, cylinder or cone.Circle CalculatorArea, circumference and diameter from a circle's radius.Triangle CalculatorArea, perimeter and angles of a triangle from its three sides.Right Triangle CalculatorHypotenuse, area and angles of a right triangle from its two legs.Pythagorean Theorem CalculatorSolve a² + b² = c² for the hypotenuse or a missing leg.Distance CalculatorStraight-line distance between two points in 2-D or 3-D.Matrix CalculatorAdd, subtract or multiply 2×2 / 3×3 matrices and find determinants.Probability CalculatorCombine the probabilities of two independent events (and / or / not).Mean, Median, Mode CalculatorThe three measures of center, plus range, for a data set.Standard Deviation CalculatorStandard deviation and variance for a population or a sample.Z-Score CalculatorStandardize a value and find its percentile under the normal curve.Sample Size CalculatorRequired survey sample size for a confidence level and margin of error.Statistics CalculatorFull descriptive summary of a data set in one place.Permutation and Combination CalculatorCount ordered (nPr) and unordered (nCr) selections.Confidence Interval CalculatorConfidence interval for a mean from sample statistics.P-Value CalculatorConvert a z-score into one- and two-tailed p-values.Number Sequence CalculatorNth term and sum of arithmetic, geometric or Fibonacci sequences.Scientific CalculatorA full button-driven scientific calculator — trig, logs, powers, roots, factorial, memory and history.