Mass Converter
Free, locally-processed mass converter for fast and secure results.
Runs locally in your browser
Your inputs are processed locally in your browser and are not uploaded or stored by us.
Converts between metric and imperial mass units (commonly referred to as weight).
How to use the Weight Converter
- Enter the mass/weight value you want to convert.
- Select the original unit from the first dropdown.
- Select the target unit from the second dropdown.
- Click Calculate.
Mass conversion methodology
1 lb = 0.45359237 kg
1 stone = 14 lb
1 metric tonne = 1000 kg
The calculator uses the kilogram as the canonical base unit. Note that these are technically mass units, though commonly referred to as weight.
Mass conversion example
Value1
From UnitKilogram
To UnitPound
1 kg ÷ 0.45359237 kg/lb
Result: approximately 2.2046226218 lb
Notes
- The calculator uses documented conversion constants without rounding intermediate calculation values. Display formatting may shorten the visible result.
- The unqualified term "ton" is avoided in favor of "metric tonne".
- Negative mass values are rejected as invalid.