Math Calculators

Work through arithmetic, algebra, geometry, and statistics with tools that show their working. Use the basic calculator on this page for quick sums, or pick one of the calculators below: the scientific calculator handles trigonometry, logarithms, and powers; the fraction and percentage tools simplify ratios and change; the triangle, exponent, factor, and factorial utilities cover geometry and number theory; and the standard deviation calculator walks through mean, variance, and spread. Every result is computed in your browser with standard double-precision arithmetic, and the pages that need it state their formula and rounding behaviour so you can reproduce the answer by hand.