Mass and Weight Unit Converter
Convert mass measurements between metric units, tonnes, pounds, ounces, and stones using standard conversion factors.
About this tool
Convert mass measurements between metric units, tonnes, pounds, ounces, and stones using standard conversion factors. Enter an amount, choose the source unit, and select the target unit. The converter uses the stated unit definitions and runs locally in your browser without uploading values. For common units, factors are based on standard definitions; temperature and fuel economy require non-linear conversions and are handled separately. Check that the selected units match the context of your measurement.
How to use this tool
- Enter a finite amount.
- Choose the source unit and target unit.
- Convert and verify the unit labels before using the result.
How it works
Mass and Weight Unit Converter converts through a shared base unit, except for unit families whose scales use offsets or reciprocal relationships.
When to use this tool
- Comparing measurements supplied in different unit systems.
- Checking a conversion while studying or preparing a project estimate.
Limitations
Mass and Weight Unit Converter uses conversion factors that represent defined unit relationships; they do not validate instrument accuracy or measurement context.
Privacy
The amounts entered in Mass and Weight Unit Converter remain in browser memory and are not uploaded by this tool.