Convert stone to kilograms for traditional UK weight measurements.
Convert stone to kilograms using the official UK imperial standard conversion factor of 1 stone = 6.35029318 kilograms.
Convert stone to kilograms for traditional UK weight measurements.
Convert stone to kilograms using the official UK imperial standard conversion factor of 1 stone = 6.35029318 kilograms.
Stone is primarily used in the UK and Ireland. For international health records and fitness tracking, use kilograms or pounds instead.
Common mistake: Americans unfamiliar with stone often confuse it with pounds. One stone equals 14 pounds, not 1 pound. Also, mistakenly using approximate values like 6.4 kg per stone can introduce errors.
| Item | Stone | Kilograms |
|---|---|---|
| Average UK male | 12 | 76.2 |
| Average UK female | 10 | 63.5 |
| Lightweight boxer | 8 | 50.8 |
| Heavyweight | 16 | 101.6 |
| Newborn | 0.5 | 3.18 |
1 stone equals exactly 6.35029318 kilograms.
Stone is rarely used in the US. Americans primarily use pounds for body weight.
The official UK imperial standard defines 1 stone as exactly 6.35029318 kilograms.
1 stone equals exactly 14 pounds.
Stone is a traditional unit deeply rooted in British culture for measuring body weight, similar to how Americans use pounds.
10 stone equals 140 pounds, which is approximately 63.5 kilograms.
Last Updated: 2026 · Reviewed by the UnitFig editorial team