Is the unit converter free?

Yes, completely free with no signup required.

All conversions run in your browser. Your file never leaves your browser.

How accurate are the conversions?

Conversions use standard SI conversion factors. Temperature uses exact formulas. Results are shown to up to 10 significant figures.

Yes. All categories include both metric and imperial/US units.

Convert between units of length, weight, temperature, area, volume, speed, data and time.

🔒 Your file never leaves your browser. All conversions run locally.

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1
Choose a category
Select a unit category: Length, Weight, Temperature, Area, Volume, Speed, Data, or Time.
2
Enter your value
Type a value in the From field and select the unit to convert from.
3
Select target unit
Select the To unit. The converted result appears instantly.