Calculators for Everyday Math

The math that actually comes up: a discount at the register, a room that needs flooring, a recipe you're doubling. Pick a calculator and type; the answer keeps up with you.

Percentage CalculatorWhat is 15% of 80? What percent is 12 of 80? How big was that price jump? Three percent questions, one page, with the working shown under every answer. Square Footage CalculatorMeasure a room in feet and inches, add rooms together, and price out flooring or paint by the square foot. Ratio CalculatorSolve a:b = c:d, simplify a ratio, or scale one up for a bigger batch. Fraction CalculatorAdd, subtract, multiply or divide two fractions, simplified with steps. Average CalculatorPaste a list of numbers and get mean, median, mode, range, sum and count in one go.