Math & Calculators

Percentages, geometry, dates and unit conversions with the working shown.

Calculate area, perimeter, diagonals and angles for rectangles, squares, circles and triangles. Shows the working.

Convert any number to words in English. Also shows ordinal form, currency and Roman numerals. Instant and completely offline.

All common percentage calculations in one place: percent of a number, percentage change, ratio to percentage and increase/decrease.