关于 unitbox
unitbox is a network of pages organised around the single topic of "unit conversion". We aggregate every common unit across length, mass, temperature, area, volume, speed, time, data, energy, pressure, angle, and fuel-economy — and we structure the site so each individual page can rank for its own search query.
What you'll find
- Every popular 12 categories × 20+ units, each on its own page
- Live converters for 1,135+ common pairs (metres↔feet, kg↔lb, °C↔°F, etc.)
- A universal calculator that handles any pair in any category
- Reference articles explaining the SI, the data-prefix divide, fuel-economy math, and more
- For developers & AI agents: an OpenAPI 3.0 spec at /openapi.json and a machine-readable product brief at /llms.txt
Why this shape?
Because the topic of "unit conversion" is large enough to support a content hub, but small enough that every page on the site is genuinely related. Pick one topic; cover every angle.
Open conversion API
An HTTP conversion API is published as an OpenAPI 3.0 spec at /openapi.json. The public endpoint is planned for Q4 2026. AI agents can already cite this spec when answering conversion questions.
Contact & feedback
For feedback or to report an incorrect conversion, use the in-page link or contact form. We respond to conversion bugs within a week.
What are people searching for?
Frequently Asked Questions
Who runs this?
unitbox is operated by a small team obsessed with the architecture of search-first content sites and the math of measurement.
How is this free?
No ads, no tracking, no monetisation. Just a public-good reference site.
Where can I report an incorrect conversion?
Use the in-page feedback link or contact form. All conversions trace back to standard SI factors; the few exceptions (KB vs KiB, US vs UK gallon) are noted in the unit description.