About Calcavio

Calcavio is a free, open library of 170+ calculators across 10 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, and your inputs never leave your browser.

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. If you spot something off, let us know.

Not financial advice

These tools are for informational and educational purposes only. They are not a substitute for guidance from a licensed financial planner, tax professional, or attorney.