Calculators
Free Unit Converter
Convert length, weight, temperature and other everyday measurements in seconds.
Private by default — your numbers stay on your device.
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Results update as you type.
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Conversions are rounded for display. No exchange rates or live prices are included.
How to convert
Choose a category, enter a number, then select your starting and target units. Use Swap units to reverse the conversion. Negative numbers work where meaningful, such as temperature.
What is included?
Convert common length, weight, temperature, volume, area and speed units. Cups and gallons here use US measures. This tool uses fixed conversion factors on your device; it does not fetch rates or send your numbers anywhere.
Frequently asked questions
Are the results exact?
The tool uses standard fixed unit factors and rounds the displayed result. Very precise work may need a specialist calculator.
Which gallon is used?
US gallons and US cups are labelled in the Volume category. Imperial gallons are not included.
Are my numbers saved?
No. Conversion runs in your browser, and the entered number is cleared when you leave the page.