Free Online Unit Converter
Values convert both ways as you type, and the factor used is shown so you can sanity-check a strange result.
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How to use Unit Converter
- Pick the category.
- Choose the source unit and type the value.
- Read the converted number, or switch units to go the other way.
Questions about Unit Converter
Which precision is shown?
Six significant digits; hover the field for the exact decimal value.
Are UK and US pints different?
Yes, 568 ml versus 473 ml, and the converter keeps them separate.
About Unit Converter
Convert length, weight, temperature and more with our free online Unit Converter. 100% browser-based, fast, and private—no login or file uploads required.
These calculators and converters turn everyday numbers into answers instantly: percentages, BMI, loans and interest, units, colours and dates, with the formula shown so you can check the working.
This tool runs in your browser. The file is not uploaded. Results update as you type and are rounded for display; for money or legal figures keep the unrounded value and double-check against your own spreadsheet before relying on it.