Numio is a free, multilingual collection of online calculators for everyday life — finance, health, engineering, math, and unit conversion.
Our mission
Make accurate, well-sourced calculations available to anyone, in any language, on any device — without sign-ups, tracking, or paywalls. Every calculator cites its formula and references the standard or authority it follows.
How it works
- 100% client-side. Calculations run in your browser. Nothing you type is sent to any server.
- Open formulas. Each calculator links to the published formula or standard (WHO, NIST, IEEE, etc.) it implements.
- 12 languages. UI, content, and number formatting all adapt to your locale.
- Built for the web. Static pages, fast loading, works offline once visited.
Built by AI
This entire site — architecture, components, calculators, translations, and tests — was built and reviewed by a team of AI agents working in parallel, then merged by a coordinating agent. The process is open and documented in the repository.
Roadmap
We are growing from a single golden-reference calculator (BMI) to 100+ calculators across all five categories. Health and finance get priority, since they're the most commonly searched.