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Unit converter
Length, weight, and temperature — metric and imperial, instantly.
Length
Weight
Temperature
How it works
Length and weight use fixed, exact conversion factors (for example, 1 mile = 1,609.344 meters); temperature uses the real Celsius/Fahrenheit/Kelvin formulas rather than a simple ratio, since those scales don't share a zero point.
FAQ
- How precise are the conversions?
- Fully precise to floating-point limits — these are exact defined conversion factors, not rounded approximations.
- Why can't temperature just use a multiplier like length and weight?
- Celsius, Fahrenheit, and Kelvin have different zero points, so converting between them requires addition/subtraction as well as multiplication (e.g. °F = °C × 9/5 + 32).
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