Math Calculators
From everyday percentages to statistics. Every tool is free, with transparent formulas and worked examples.
Percentage Calculator
Find what percentage one number is of another, with clear working.
MathFraction Calculator
Add, subtract, multiply, and divide fractions. Get a simplified answer.
MathStandard Deviation Calculator
Find sample or population spread, variance, mean, and count.
MathPercentage Change Calculator
Measure an increase or decrease using the original value as the explicit base.
MathRatio & Proportion Calculator
Simplify a whole-number ratio or find the missing fourth value in a proportion.
MathWeighted Average Calculator
Calculate an average when observations have different weights or importance.
MathQuadratic Equation Calculator
Find real or complex roots and handle a linear equation when a equals zero.
MathTriangle Calculator
Find triangle sides, angles, area and perimeter from SSS, SAS or two angles and a side.
MathScientific Calculator
Evaluate arithmetic expressions, powers, factorials, logarithms and trigonometric functions.
MathGreatest Common Factor Calculator
Find the largest common factor of several integers using exact integer arithmetic.
MathLeast Common Multiple Calculator
Find the smallest common multiple of several integers with exact results and explicit zero handling.
MathPrime Factorization Calculator
Split a positive whole number into prime factors and check whether the original number is prime.
MathTrapezoid Calculator
Calculate trapezoid area, median, side lengths and perimeter from two parallel bases and a height.
MathSolid Volume Calculator
Find the volume of a box, sphere, cylinder, cone or rectangular pyramid from its dimensions.
MathSlope Calculator
Find a line’s slope, intercepts and equation from two points, with a visual line segment.
MathLong Division Calculator
Divide whole numbers exactly, then follow decimal digits, remainders and repeating blocks.
MathScientific Notation Calculator
Convert, add, subtract or multiply written decimal numbers without dropping their entered digits.
MathDescriptive Statistics Calculator
Summarize a dataset with median, modes, interpolated quartiles, range and a frequency table.
MathPercentage Difference Calculator
Compare two nonnegative measurements using their average as a symmetric percentage base.
MathPermutations & Combinations Calculator
Count ordered or unordered selections, with or without replacement, using exact integers.
MathProbability Calculator
Calculate union, intersection and complement probabilities with an explicit dependence assumption.
MathSample Size Calculator
Estimate completed responses for one population proportion, including an optional finite-population correction.
MathConfidence Interval Calculator
Estimate a mean interval using t or known-sigma z, or a binomial proportion using Wilson’s method.
MathP-Value Calculator
Find a null-distribution tail probability for normal, Student t, chi-square or F statistics.
Math