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Convert stone to kilograms
Instant, accurate st → kg conversion with a live converter, table and formula.
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1 stone = 6.35029 kilograms
1 kilogram = 0.157473 stone
stone to kilograms table
| stone (st) | kilograms (kg) |
|---|---|
| 0.5 | 3.17515 |
| 1 | 6.35029 |
| 2 | 12.7006 |
| 5 | 31.7515 |
| 10 | 63.5029 |
| 20 | 127.006 |
| 50 | 317.515 |
| 100 | 635.029 |
| 500 | 3175.15 |
| 1000 | 6350.29 |
Formula
kilograms = stone × 6.35029.
Example
10 stone = 63.5029 kilograms.
What is a stone?
A stone (st) is 14 pounds (6.35 kg), used for body weight in the UK and Ireland.
What is a kilogram?
The kilogram (kg) is the SI base unit of mass; one liter of water weighs about 1 kg.
Real-world reference points
A kilogram is a liter of water; a pound is a loaf of bread; an ounce is a slice of it.
| Reference | stone | kilograms |
|---|---|---|
| Smartphone | 0.0283 st | 0.18 kg |
| Liter of water | 0.157 st | 1 kg |
| Newborn baby (average) | 0.52 st | 3.3 kg |
| Airline checked-bag limit (common) | 3.62 st | 23 kg |
| Cement bag (standard) | 7.87 st | 50 kg |
Mistakes to avoid with mass conversions
- Confusing weight ounces with fluid ounces — one measures mass, the other volume.
- Reading 'stone and pounds' (11 st 6 lb) as decimal stone (11.6 st) — they differ.
- Comparing net vs gross weight when shipping: the box and padding count toward limits.
Frequently asked questions
How many kilograms in a stone?+
1 stone = 6.35029 kilograms.
How do I convert stone to kilograms?+
Enter the value in the stone box above and the kilograms value appears instantly. You can also type in the kilograms box to convert the other way.
Is this st to kg converter free?+
Yes — it is 100% free, needs no sign-up, and runs entirely in your browser.