About Calcavio

Calcavio is a free, open library of 475+ calculators across 28 categories — finance, health, math, science, fitness, conversions, and more — built to help you make confident decisions in seconds.

Why we built it

Most financial calculators online are buried in ads, locked behind logins, or send your data to a server. We built Calcavio so the math is fast, the formulas are correct.

Our accuracy commitment

Every loan, amortization, compound-interest, and tax calculation uses the same formulas a financial professional would use, and we test results against established sources.