Unit converter
Convert between metric and imperial units.
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About this tool
Convert between metric and imperial units across the most common categories - length, mass, volume, area, speed and temperature. All conversions run locally with full floating-point precision.
Handy for cooking, travel, engineering work, and homework alike.
Features
- Length, mass, volume, area, speed, temperature
- Metric and US/Imperial units side by side
- Accurate temperature conversions (°C, °F, K)
- Instant, no-network conversion
How to use it
- Pick a category.
- Choose the source and target units.
- Type a value - the converted result updates as you type.
🔒 100% private
Everything happens inside your browser using JavaScript and WebAssembly. Your files are never uploaded to a server, never stored, and never seen by us.
Frequently asked questions
Are US and UK volumes different?
Yes - a US gallon is 3.785 L, a UK gallon is 4.546 L. Both are listed separately under Volume.
How precise are the results?
Conversions use double-precision floats and standard NIST conversion factors, then round to 10 significant digits for display.