APY Calculator — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Open the full browser tool →

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No data collection⚡ Edge-fast

Usage — APR to APY

curl "https://apy-calculator-formatho.filesformatho.workers.dev/api?apr=5&n=12"

5% APR compounded monthly → 5.1162% APY. Supports any compounding frequency from annually to daily, plus n=continuous.

Usage — with growth projection

curl "https://apy-calculator-formatho.filesformatho.workers.dev/api?apr=4.5&n=365&principal=10000&years=5"

Add a principal and term to get the final balance and interest earned.

Full parameter reference: /api endpoint.

Privacy-first: math runs in-memory at the edge; nothing you send is logged or stored.

Full browser tool

Compute APY entirely client-side: APY Calculator on formatho.com.

All Formatho edge APIs

Browse every free Formatho Worker tool on the Formatho Tools index.