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. Loan Calculator Calculate monthly payments, total interest, and amortization schedule. Tip Calculator Calculate the tip, total bill, and each person's share when splitting. Calorie Calculator Calculate daily calorie needs (TDEE) and BMR from age, height, and weight. Compound Interest Calculator See the final amount, total interest, and year-by-year growth of savings. Scientific Calculator Trigonometry, logarithms, powers, roots, factorial, and memory keys. Discount Calculator Sale price, discount amount, savings, and stacked coupons.