A free set of financial calculators: compound interest with monthly contributions, future value, real return, FIRE, retirement, loan amortization, debt payoff, rent vs buy and more. Each one explains the math step by step and shows how the result builds over time — not just a final number. Currency and sources adapt by country. No signup, in 6 languages (EN, ES, FR, IT, DE, HI).
A free set of health, fitness and nutrition calculators: BMI, body fat, ideal weight, RMR/TDEE, calories, macros, 1RM, running pace and VO2 max. Each one explains the formula step by step and shows the result on a visual gauge — so you understand it, not just read a number. No signup, works right in the browser, in English, Español, Français, Italiano, Deutsch and हिन्दी.
