kg to Stones Converter
Enter a weight in kilograms to see it converted to stones, stones and pounds, total pounds, and total ounces. Switch to reverse mode to convert stones (and optional pounds) back to kilograms. The conversion updates as you type and a step-by-step panel shows exactly how the numbers are worked out.
What is a stone?
A stone is a unit of mass equal to exactly 14 pounds avoirdupois, which works out to 6.35029318 kilograms. It has been used in Britain since at least the 14th century and was standardised at 14 lb in the 19th century. Today the stone survives almost exclusively as a body-weight unit in the United Kingdom, Ireland, and some other countries with historical British influence. Most medical, scientific, and international contexts use kilograms instead, so knowing how to convert between the two is practically useful for anyone moving between those worlds.
How to convert kg to stones
Divide the weight in kilograms by 6.35029318 to get decimal stones. To express the result in the traditional "stones and pounds" format, take the whole-number part as the stone count, then multiply the fractional remainder by 14 to get the remaining pounds. For example, 70 kg divided by 6.35029318 is approximately 11.023 stones, which is 11 stones and 0.32 pounds (rounding to 11 st 0.3 lb). If you want total pounds, divide kilograms by 0.45359237 (or equivalently multiply by 2.20462). Each pound is 16 ounces, so multiply total pounds by 16 for ounces.
How to convert stones to kg
Multiply the total decimal stones by 6.35029318 to get kilograms. If the weight is given as stones and pounds separately, first convert the pounds part to a fraction of a stone by dividing by 14, add that to the whole stone count, and then multiply the total by 6.35029318. For example, 11 stone 7 lb: 7 / 14 = 0.5, so the total is 11.5 stones, and 11.5 x 6.35029318 = 73.03 kg.
Why stones are still used
Despite metrication, the stone remains the everyday body-weight unit for most people in the United Kingdom and Ireland. Bathroom scales sold in those markets typically show kilograms and stones-and-pounds side by side. Health services and GP consultations increasingly record weight in kilograms, creating a practical need to convert fluently in both directions. Outside the UK and Ireland the stone is almost unknown: the United States uses pounds only, and most of the rest of the world uses kilograms.
Common weight conversions: kg to stones and pounds
| Kilograms (kg) | Stones (decimal) | Stones and pounds | Total pounds (lb) |
|---|---|---|---|
| 45 | 7.09 st | 7 st 1.2 lb | 99.2 lb |
| 50 | 7.87 st | 7 st 12.2 lb | 110.2 lb |
| 55 | 8.66 st | 8 st 9.2 lb | 121.3 lb |
| 60 | 9.45 st | 9 st 6.3 lb | 132.3 lb |
| 65 | 10.24 st | 10 st 3.3 lb | 143.3 lb |
| 70 | 11.02 st | 11 st 0.3 lb | 154.3 lb |
| 75 | 11.81 st | 11 st 11.3 lb | 165.3 lb |
| 80 | 12.60 st | 12 st 8.4 lb | 176.4 lb |
| 85 | 13.39 st | 13 st 5.4 lb | 187.4 lb |
| 90 | 14.17 st | 14 st 2.4 lb | 198.4 lb |
| 95 | 14.96 st | 14 st 13.5 lb | 209.4 lb |
| 100 | 15.75 st | 15 st 10.5 lb | 220.5 lb |
| 110 | 17.32 st | 17 st 4.5 lb | 242.5 lb |
| 120 | 18.90 st | 18 st 12.6 lb | 264.6 lb |
Reference values covering typical adult body weights. One stone = 6.35029318 kg exactly.
Frequently asked questions
How many kg is 1 stone?
One stone is exactly 6.35029318 kilograms. This is because one stone equals 14 pounds avoirdupois, and one pound is exactly 0.45359237 kg under the international agreement signed in 1959, giving 14 x 0.45359237 = 6.35029318 kg.
How do I convert kg to stone and pounds?
Divide the kilogram value by 6.35029318 to get decimal stones. The whole-number part is the stone count. Multiply the leftover decimal fraction by 14 to get the remaining pounds. For example, 80 kg / 6.35029318 = 12.598 st, so that is 12 stone and 0.598 x 14 = 8.4 lb, written as 12 st 8 lb.
What is 70 kg in stones?
70 kg is approximately 11.023 stones, or 11 stones and 0.3 pounds. In everyday rounding that is usually stated as 11 stone.
What is 100 kg in stones?
100 kg is approximately 15.747 stones, or 15 stone 10 lb (0.747 x 14 = 10.46 lb). A quick approximation is to divide by 6.35.
Is there a quick way to estimate kg to stones in my head?
A practical rule of thumb is to divide the kilogram figure by 6.35 (or multiply by 0.157). For a faster mental estimate, note that 5 kg is roughly 0.787 stone, so 50 kg is about 7.87 stone, 100 kg is about 15.75 stone, and so on. The error from using 6.35 instead of 6.35029 is negligible for everyday purposes.
Do US doctors use stones?
No. In the United States, body weight in medical and everyday contexts is measured in pounds (lb), not stones. Stones are used almost exclusively in the UK, Ireland, and a few other countries with historical British ties. US medical records and charts show pounds or kilograms.
How many pounds is 1 stone?
1 stone is exactly 14 pounds. This relationship is fixed by definition and has been standardised since the 19th century. So if you know a weight in stones, multiply by 14 to get pounds, or divide pounds by 14 to get stones.