Unit Converter Online Free
Convert length, weight, temperature, area, volume and speed between common units.
1 Millimetre = 0.001 Metre
How to use this tool
- 1Choose the category you are converting, such as length or weight.
- 2Select the unit you are converting from and the unit you want.
- 3Type your value.
- 4Read the converted result and copy it.
About this tool
Two measurement systems still coexist, and the gap between them causes daily friction. Recipes come in cups when your scales read grams. Height is asked for in centimetres on a form and you know it in feet. Shipping quotes use kilograms while the parcel label says pounds. Oven temperatures switch between Celsius and Fahrenheit depending on where the recipe was written. Getting a conversion wrong ranges from mildly annoying to genuinely expensive when it involves freight, materials or dosage. This converter covers the categories that come up most — length, weight, temperature, area, volume and speed — using exact standard factors rather than rounded approximations, and updates the result as you type so you can explore a range of values quickly.
Frequently Asked Questions
Why is temperature different from other conversions?
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Temperature scales have different zero points, so conversion needs an offset as well as a multiplier rather than a simple ratio.
How precise are the results?
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Standard exact conversion factors are used and results are shown to a sensible number of decimal places for practical use.
Are US and UK gallons the same?
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No. A UK imperial gallon is about 20 percent larger than a US gallon, so they are listed separately.