This converter turns stones into kilograms instantly, using the exact factor 1 stone = 6.35029318 kilograms. Type any number and the result updates as you go — nothing is sent to a server, so the arithmetic happens entirely in your browser.
Fourteen pounds — still the customary way to state body weight in the UK and Ireland. The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Because the relationship is a simple proportion, one multiplication does the whole job. The table further down gives pre-computed values for the amounts people look up most often, and the result panel also reports the reverse conversion so you can check the figure both ways.
The formula
stones- The amount you are converting, measured in stones
6.35029318- The exact number of kilograms in one stone
kilograms- The converted result
How it works, step by step
- Enter the number of stones you want to convert.
- The value is multiplied by 6.35029318, the exact conversion factor.
- The result is displayed in kilograms, rounded for readability.
- The unrounded value and the reverse conversion appear underneath so you can verify it.
Worked examples
Converting 5 stones
Multiply 5 by 6.3502932. That gives 31.7515 kilograms. A quick sanity check: one stone is larger than one kilogram, so the number should get bigger — and it does.
Converting 72 stones
72 × 6.3502932 = 457.2211 kilograms. Working backwards, 457.2211 ÷ 6.3502932 returns 72 stones, which confirms the factor is applied the right way round.
How to read your score
Frequently asked questions
How many kilograms are in one stone?
Exactly 6.35029318. Every conversion on this page is that single number multiplied by your input, so the result carries no rounding error beyond what is shown.
What is the formula to convert stones to kilograms?
Kilograms = stones × 6.35029318. To reverse it, divide instead: stones = kilograms ÷ 6.35029318, which is the same as multiplying by 0.1574730444.
Is the stone bigger than the kilogram?
Yes. One stone equals 6.35029 kilograms, so it is the larger unit.
Why does my answer differ slightly from other stones to kg converters?
Most differences come from rounding the factor too early. This tool keeps full double precision through the calculation and only rounds at the final display step, and it also shows the unrounded value so you can see exactly where any difference appears.
What is a stone?
Fourteen pounds — still the customary way to state body weight in the UK and Ireland.
What is a kilogram?
The SI base unit of mass, redefined in 2019 in terms of the Planck constant.
Stones to kilograms reference table
| Stones | Kilograms |
|---|---|
| 0.5 st | 3.1751 kg |
| 1 st | 6.3503 kg |
| 2 st | 12.7006 kg |
| 3 st | 19.0509 kg |
| 5 st | 31.7515 kg |
| 10 st | 63.5029 kg |
| 15 st | 95.2544 kg |
| 20 st | 127.0059 kg |
| 25 st | 158.7573 kg |
| 50 st | 317.5147 kg |
| 75 st | 476.272 kg |
| 100 st | 635.0293 kg |
| 250 st | 1,587.57 kg |
| 500 st | 3,175.15 kg |
| 1000 st | 6,350.29 kg |
Exact factor: 1 stone = 6.35029318 kilograms. Values rounded for display.