Stone to Kg Converter
Enter a value in stone to convert it to kilograms — 1 st = 6.3503 kg.
Reviewed by the ToolNestr Editorial Team — July 2026
How to convert stone to kilograms
Converting stone to kilograms is a simple multiplication: take your weight in stone and multiply by the fixed conversion factor of 6.35029 to get kilograms. Because the factor never changes, the same calculation works for any value, from tiny amounts to very large ones. The converter above applies it the moment you type, with no rounding errors in the underlying maths.
Convert a British body weight in stone into kilograms for medical forms, gym apps and international comparison. Knowing how to move between stone and kilograms is useful whenever measurements are given in one system but you need them in the other — for shopping, travel, study, cooking, engineering or simply comparing figures from different countries.
The reference table below lists common stone values already converted to kilograms, so you can read off everyday amounts at a glance without typing. For the opposite direction, use the Kg to Stone Converter, which reverses the calculation exactly.
The formula and a worked example
Formula
kg = st × 6.35029
Worked example
To convert 10 stone: 10 × 6.35029 = 63.5029 kg. To convert 25 stone: 25 × 6.35029 = 158.7573 kg.
Stone to Kg conversion table
| Stone (st) | Kilograms (kg) |
|---|---|
| 1 | 6.3503 |
| 2 | 12.7006 |
| 5 | 31.7515 |
| 10 | 63.5029 |
| 25 | 158.7573 |
| 50 | 317.5145 |
| 100 | 635.029 |
| 250 | 1,587.5725 |
| 500 | 3,175.145 |
| 1,000 | 6,350.29 |
Values are rounded for display; the converter above keeps full precision.
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Frequently asked questions
How do I convert stone to kilograms?
Multiply the number of stone by 6.35029. For example, 10 st × 6.35029 = 63.5029 kg. The converter above does this automatically.
How many kilograms are in one stone?
There are 6.3503 kilograms in one stone. Multiply by 6.35029 for any amount.
Is this Stone to Kg converter accurate?
Yes. It uses the exact conversion factor of 6.35029, so results are precise. Values shown in the table are rounded for readability.
How do I convert kilograms back to stone?
Use our Kg to Stone Converter for the reverse direction, or divide the kilograms value by 6.35029.