About Calcolio

Free online calculators with step-by-step working: probability, statistics and retirement planning. No sign-up.

Calcolio is a small independent project that builds simple, fast tools that work without sign-up. The tools run in your browser wherever possible, so your data stays on your device.

The site is supported by advertising. If you find a bug, a wrong result or a missing feature, please email us — we read every message.