Unit Converter
Switch between length, weight, temperature, volume and area units instantly.
How to use
- Pick a measurement category like length, weight, or temperature.
- Select the unit you are converting from.
- Enter the value to convert.
- Pick one or more target units and see the conversions live.
- Use the swap button to flip source and target instantly.
Frequently asked questions
Which categories are supported?
Length, area, volume, weight, temperature, speed, time, pressure, energy, power, and data storage. Each category includes both metric and imperial units plus common scientific ones.
Are the conversion factors official?
Yes. Conversions use the SI-defined or NIST-published factors. For some imperial units there is both a US and a UK definition (gallons, tons); the tool clearly labels which is which.
How precise are the results?
Results are shown to 6 significant figures by default and can be expanded. JavaScript double precision gives roughly 15-17 significant digits of headroom.
Why does Celsius to Fahrenheit need more than multiplication?
Temperature scales have different zero points, so the conversion needs both a multiplication and an addition: F = C × 9/5 + 32. Most other unit conversions are pure scaling.
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