Math Calculators
Percentages, averages, ages, and dates — quick answers with the formula and worked steps.
GPA Calculator
Add a row per course and get your credit-weighted grade point average on the standard 4.0 scale.
MathDate Duration Calculator
Find the time between two dates in years, months, weeks, and days — or add and subtract days from any date.
MathPercentage Calculator
Three tools in one: percent of a number, what percent X is of Y, and percentage increase or decrease.
MathAge Calculator
Find your exact age in years, months, and days, plus total days, weeks, and hours lived.
MathAverage Calculator
Paste a list of numbers to get the mean, median, sum, count, min, max, and range instantly.
MathStandard Deviation Calculator
Get the sample or population standard deviation, variance, and mean from any data set.
MathSquare Root Calculator
Find a square root as a decimal and in simplified radical form, plus the square and cube root.
MathRatio Calculator
Solve a proportion A:B = C:D for any missing value, and simplify a ratio to its lowest terms.
MathGCF Calculator
Find the greatest common factor of two or more whole numbers, with the LCM shown too.
MathLCM Calculator
Find the least common multiple of two or more numbers, with the greatest common factor too.
MathCircumference Calculator
Get a circle's circumference, area, radius, and diameter from the radius or diameter, using π.
MathZ-Score Calculator
Turn a value, mean, and standard deviation into a z-score and its normal-distribution percentile.
MathQuadratic Formula Calculator
Solve ax² + bx + c = 0 for both roots, with the discriminant and whether the roots are real or complex.
MathSlope Calculator
Find the slope, y-intercept, equation, and distance from two points on a line.
MathExponent Calculator
Raise any base to any power, including negative and fractional exponents (roots).
MathScientific Notation Calculator
Convert a number to scientific, E-, and engineering notation, with its order of magnitude.
MathPythagorean Theorem Calculator
Solve a² + b² = c² for the hypotenuse or either leg, with perimeter, area, and angles.
MathRoman Numeral Converter
Convert numbers to Roman numerals and back, from 1 to 3999, with the breakdown shown.
MathMidpoint Calculator
Find the midpoint of a segment between two points, plus the distance and slope of the line.
MathPermutation & Combination Calculator
Find permutations (nPr), combinations (nCr), and factorials from n and r, with the formulas.
MathLog Calculator
Find the logarithm of a number in any base, plus the natural log (ln), log base 10, and log base 2.
MathFraction Calculator
Add, subtract, multiply, or divide fractions and get the answer simplified, as a decimal and mixed number.
MathNumber Base Converter
Convert between binary, octal, decimal, and hexadecimal — enter any base and see all four.
MathFactor Calculator
Find all factors of a number, its prime factorization, factor count, and the sum of factors.
MathProbability Calculator
Combine two independent events to find the chance of both, either, neither, and exactly one.
MathPercent Error Calculator
Compare a measured value to the true value for percent error, absolute error, and the signed difference.
MathLong Division Calculator
Divide two whole numbers for the quotient and remainder, the decimal result, and quotient R remainder.
MathModulo Calculator
Find a mod n — the remainder after division — plus the quotient, with negative numbers handled correctly.