Stone to KG Converter
Convert stone to kilogram instantly. 1 st = 6.35029318 kg, worked steps and a full reference table.
How to use it
- Type the value in stone — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 st | 6.35029318 kg |
| 5 st | 31.7514659 kg |
| 10 st | 63.5029318 kg |
| 100 st | 635.029318 kg |
One stone equals 6.3502932 kilograms (kg). To convert stones to kilograms, multiply by 6.3502932; to go back the other way, multiply by 0.15747304 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What stones and kilograms actually measure
Stone (st) — A stone is fourteen pounds, about 6.35 kilograms. Body weight in the UK and Ireland, and almost nowhere else.
Kilogram (kg) — The kilogram is the SI base unit of mass, defined since 2019 by the Planck constant rather than a metal cylinder in Paris. Body weight, groceries and shipping across most of the world.
Stone to KG conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| st | kg |
|---|---|
| 1 st | 6.3502932 kg |
| 2 st | 12.700586 kg |
| 5 st | 31.751466 kg |
| 10 st | 63.502932 kg |
| 25 st | 158.75733 kg |
| 50 st | 317.51466 kg |
| 100 st | 635.02932 kg |
How to convert stones to kilograms by hand
Multiply the number of stones by 6.3502932.
For example, 25 st × 6.3502932 = 158.75733 kg.
Going the other way, divide by 6.3502932 — or multiply by 0.15747304, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many kg are in 1 st?
1 st equals exactly 6.35029318 kg. Multiply any value in stone by 6.35029318 to get kilogram.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026