How to Convert Stone to Kilograms (st to kg)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert stone into kilograms by hand, with examples and a quick-reference table.
The conversion
To convert stone to kilograms, multiply the value by 6.35029318. To go the other way, divide by the same number (or multiply by 0.1574730444). For a quick estimate, multiply by about 6.4.
Kilograms = stone × 6.35029318
Worked examples
- 3 st = 19.0509 kg
- 12.5 st = 79.3787 kg
- 75 st = 476.272 kg
Stone to Kilograms table
| Stone | Kilograms |
|---|---|
| 1 st | 6.3503 kg |
| 2 st | 12.7006 kg |
| 5 st | 31.7515 kg |
| 10 st | 63.5029 kg |
| 20 st | 127.0059 kg |
| 25 st | 158.7573 kg |
| 50 st | 317.5147 kg |
| 100 st | 635.0293 kg |
| 250 st | 1,587.57 kg |
| 500 st | 3,175.15 kg |
| 1,000 st | 6,350.29 kg |
Common questions
Is st to kg exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Kilograms to Stone converter.
Mistakes to avoid
Forgetting squared and cubed units
Area and volume factors are the length factor squared or cubed, so 1 m² is about 10.76 sq ft, not 3.28.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Background
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For any value, use the Stone to Kilograms Converter or browse all weight converters.
Run your own numbers: Stone to Kilograms Converter