Free Math Tools Online — Calculators for Geometry & More

Free online calculators for geometry, percentages, finance, and more. Fast, private, and runs entirely in your browser — no signup required.

Triangle Calculator Area, perimeter, angles from three sides. Percentage Calculator Calculate percentage of a number, percentage change, and percentage difference. BMI Calculator Calculate Body Mass Index from height and weight. Age Calculator Calculate exact age in years, months, and days from a birthdate. Aspect Ratio Calculator Find the equivalent dimensions when scaling a rectangle.