Math calculators

Percentage Calculator

Find a percentage of a number, calculate percentage increase or decrease, apply a discount, or compare two values with percent difference.

Fraction Calculator

Add, subtract, multiply, or divide two fractions (including mixed numbers), simplify a fraction to lowest terms, or convert between mixed numbers, improper fractions, decimals, and percents.

Shape Volume & Surface Area Calculator

Find the volume and surface area of a rectangular prism, cylinder, sphere, or cone. Enter the dimensions in ft, in, yd, m, or cm and get both numbers at once.

Rounding Calculator

Round any number to a chosen number of decimal places or significant figures, with a choice of seven rounding methods including banker's rounding, and no binary floating-point rounding errors.

System of Equations Solver

Solve a system of 2 or 3 linear equations by Gaussian elimination, entered as ax + by = c (or ax + by + cz = d). Reports the exact solution, or whether it has none or infinitely many.