Unit Converter
Convert common measurement units.
Convert common measurement units.
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Tool guide
Free Online Unit Converter
Convert common measurements within length, weight, temperature, area, volume, speed, time, and data-size categories. Results update live in your browser and can be copied or downloaded after you confirm the conversion.
Steps
How it works
- Select one of the eight supported measurement categories.
- Choose compatible source and target units.
- Enter a numeric value and review the live result.
- Convert, copy, download, or swap the selected units.
Highlights
Key features
- Supports length, everyday weight, temperature, area, volume, speed, time, and data size.
- Converts between common metric and imperial units where those units are provided.
- Uses offset-aware formulas for Celsius, Fahrenheit, and Kelvin.
- Includes squared area factors and practical volume conversion constants.
- Accepts negative and scientific-notation values supported by JavaScript numbers.
- Displays up to eight fractional digits and supports swapping source and target units.
Use cases
Common uses
- Convert metric and imperial length or everyday weight values.
- Compare Celsius, Fahrenheit, and Kelvin.
- Convert area, volume, speed, or elapsed-time measurements.
- Translate byte-based data sizes for technical documentation.
Notes
Limitations to know
- Only units shown within the selected category are supported, and categories cannot be mixed.
- The Weight category uses mass conversion factors in everyday labeling.
- Results use JavaScript floating-point arithmetic and are rounded to at most eight displayed fractional digits.
- Data-size units use powers of 1024 despite the KB, MB, and GB labels.
- Currency, pressure, energy, cooking, scientific, and other specialized unit categories are not included.
FAQ
Frequently asked questions
Which unit categories are supported?
Length, Weight, Temperature, Area, Volume, Speed, Time, and Data Size are available.
Can I convert metric values to imperial units?
Yes where both units are listed, such as meters to feet, kilometers to miles, or kilograms to pounds.
Why are temperature conversions different?
Temperature scales require both an offset and a scale factor, so they cannot use simple multiplication alone.
How many decimal places are shown?
The result is locale-formatted with up to eight fractional digits.
Can I convert negative values?
Yes. Numeric negative values are accepted, although their physical meaning depends on the selected measurement.