Convert any unit, instantly
62 categories and 722 units, with the formula shown for every result. Free, fast and available as an API.
To
Formula: 1 m × 0.001 = 0.001 km
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Frequently asked questions
- Is this unit converter free to use?
- Yes. No registration, no limits.
- How accurate are the conversions?
- Conversion factors follow international measurement standards (SI and NIST definitions), and every result shows the formula used.
- Which units are supported?
- 722 units across 62 categories, from everyday length and weight to engineering, science and computing.
- Can I use it from my own app or AI assistant?
- Yes. There is a REST API and an MCP server. See the API documentation for details.