Kilograms to Stone
Quick answer: 1 kg = 0.15747 st. To convert, multiply the kg value by 0.15747; to go back, divide.
Body weight in the UK and Ireland is still spoken in stone and pounds ("11 stone 4"), while scales, doctors and gyms read kilograms. One stone is 14 pounds = 6.35029 kg, so divide kilograms by 6.35 to get stone; multiply the fraction by 14 for the pounds.
The formula
st = kg × 0.157473 · kg = st ÷ 0.157473
Common values
| kg | st | also |
|---|---|---|
| 2.5 kg | 0.394 st | 0 st 5.5 lb |
| 4.5 kg | 0.709 st | 0 st 9.9 lb |
| 10 kg | 1.575 st | 1 st 8 lb |
| 20 kg | 3.149 st | 3 st 2.1 lb |
| 40 kg | 6.299 st | 6 st 4.2 lb |
| 50 kg | 7.874 st | 7 st 12.2 lb |
| 60 kg | 9.448 st | 9 st 6.3 lb |
| 65 kg | 10.236 st | 10 st 3.3 lb |
| 70 kg | 11.023 st | 11 st 0.3 lb |
| 75 kg | 11.81 st | 11 st 11.3 lb |
| 80 kg | 12.598 st | 12 st 8.4 lb |
| 85 kg | 13.385 st | 13 st 5.4 lb |
| 90 kg | 14.173 st | 14 st 2.4 lb |
| 100 kg | 15.747 st | 15 st 10.5 lb |
| 120 kg | 18.897 st | 18 st 12.6 lb |
2.5 kg to st: 0.394 st
2.5 kg = 0.394 st — 0 st 5.5 lb. Working: 2.5 × 0.15747 = 0.3937.
2.5 kg is under half a stone — 5 lb 8 oz — which is why the number is more useful in pounds than in stone. It is the WHO low-birth-weight threshold (babies under 2,500 g), a bag of sugar plus a bag of flour, a light dumbbell, and a common parcel-rate step.
4.5 kg to st: 0.709 st
4.5 kg = 0.709 st — 0 st 9.9 lb. Working: 4.5 × 0.15747 = 0.7086.
4.5 kg is just under three-quarters of a stone — 9 lb 15 oz, essentially 10 lb: a large newborn (the 97th percentile is about 4.4 kg), a small cat, a 10 lb bowling ball. Losing 4.5 kg is what people usually mean by "losing 10 pounds".
The other way: st to kg
| st | kg |
|---|---|
| 1 st | 6.35 kg |
| 2 st | 12.701 kg |
| 5 st | 31.751 kg |
| 10 st | 63.503 kg |
| 12 st | 76.204 kg |
| 15 st | 95.254 kg |
| 20 st | 127.006 kg |
| 25 st | 158.757 kg |
| 50 st | 317.515 kg |
| 100 st | 635.029 kg |
Common mistake
Reading the decimal as pounds: 13.39 st is not 13 st 39 lb. Multiply the fraction by 14 — 0.39 × 14 = 5.5 lb.
Frequently asked questions
Is the conversion exact?
Yes — the factor follows from the legal definition of the units (1 lb = 0.45359237 kg and 1 st = 14 lb), so the only rounding is in the last decimal place shown.
How do I convert a different value?
Use the kg to st converter for any number, or the weight conversion guide for every weight unit and formula in one place.
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