Free · Unit conversions
Stone, Pounds & Metric Mass Conversion
Convert stone and other customary mass units to kilograms or other metric units, with selectors on both sides.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
One stone is 14 international pounds, exactly 6.35029318 kilograms. Ten stone equal 63.5029318 kilograms.
Kilograms = stone × 14 × 0.45359237
Worked example
Enter these known values and leave the other values blank.
- Mass in selected customary unit
- 1 st
- Mass in selected metric unit
- 6.35 kg
Assumptions and limitations
- Pounds and ounces are mass units here, not force or fluid volume.
- US short tons and imperial long tons remain distinct. The metric tonne is 1,000 kilograms.
- Zero and signed mass differences are accepted. No health classification is calculated from a mass conversion.
Common questions
How many pounds are in one stone?
This converter uses 14 international pounds per stone.
Can I convert kilograms into stone?
Yes. Enter kilograms in the metric field and select stone on the other side.
References
The calculation equations, inverse formulas, units, and input rules were imported from this source. Bookify provides the interface and equation solver.
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