Stones to kilograms
Convert stones to kilograms. One stone is 6.35029318 kg exactly, with a full body-weight table in stones, pounds and kilograms.
Runs in your browser
The formula
kilograms = stones × 6.35029318A stone is exactly 14 pounds, and a pound is exactly 0.45359237 kg, so a stone is exactly 6.35029318 kg. Nothing here is approximate.
What a stone is used for
Almost exclusively body weight, and almost exclusively in the United Kingdom and Ireland. It is not used in the United States, where body weight is quoted in pounds alone, and it is not used anywhere in continental Europe.
Weights are written as stones and pounds, not as decimal stones. 11 st 4 lb is
ordinary; 11.29 st is not something anyone says.
Stones and pounds to kilograms
| Stones and pounds | Total pounds | Kilograms |
|---|---|---|
| 7 st 0 lb | 98 lb | 44.5 kg |
| 8 st 0 lb | 112 lb | 50.8 kg |
| 9 st 0 lb | 126 lb | 57.2 kg |
| 10 st 0 lb | 140 lb | 63.5 kg |
| 11 st 0 lb | 154 lb | 69.9 kg |
| 12 st 0 lb | 168 lb | 76.2 kg |
| 13 st 0 lb | 182 lb | 82.6 kg |
| 14 st 0 lb | 196 lb | 88.9 kg |
| 15 st 0 lb | 210 lb | 95.3 kg |
| 16 st 0 lb | 224 lb | 101.6 kg |
| 20 st 0 lb | 280 lb | 127.0 kg |
Each additional pound adds 0.454 kg, so 11 st 4 lb is 69.9 + 1.8 = 71.7 kg.
Reading a weight written as two numbers
British medical notes and older records often write a weight as two bare numbers: 11 4,
9 12. The first is stones, the second pounds. The second number is always below 14,
because 14 pounds would be another stone — so a pair like 12 9 is unambiguous, and a
figure like 11 20 is a transcription error.
Converting the other way
To turn kilograms into stones and pounds, multiply by 2.2046 to get pounds, then divide by 14. The whole number is the stones and the remainder is the pounds. 80 kg is 176.4 lb, which is 12 stone with 8.4 lb left over: 12 st 8 lb.
See kg to lbs for the first step.
Estimating in your head
Multiply by 6 and add a third of a stone’s worth. More simply: 6.35 is close enough to 6⅓ that multiplying by 6 and adding a bit works. 12 stone × 6 is 72, and the true answer is 76.2 kg, so the plain sixfold estimate runs about 6% low — usable for a rough figure, not for a dose.