Stone to Kilograms
Convert stone to kilogram instantly — type a value and read the result, with the exact formula shown.
Example
1 st = 6.350293 kg, 5 st = 31.75147 kg, 10 st = 63.50293 kg.
How it works
Kilogram = Stone × 6.350293. Every value is converted through a single kilogram base unit using internationally defined conversion factors, so any from/to pair stays consistent.
Good to know
Converting stone to kilograms is something people in the UK and Ireland reach for constantly, because those countries still quote body weight in stone while almost every doctor's chart, gym scale, medication dose, and airline baggage rule uses kilograms. If a nurse asks for your weight in kg or a fitness app rejects "11 stone 4," this is the bridge you need.
The stone is a unit of the British imperial system, descended from old trading "stones" used to weigh wool and produce, and standardised at exactly 14 pounds. The kilogram is the base unit of mass in the metric SI system. Because one pound is defined as exactly 0.45359237 kg, one stone is exactly 14 × 0.45359237 = 6.350293 kg — a defined, not approximate, factor.
For quick mental math, a stone is roughly six and a third kilograms, so a handy rule of thumb is to multiply stones by 6 and then add a third of that figure: 12 st × 6 = 72, plus 24 ≈ 76 kg (the precise value is 76.2 kg). If you only need a ballpark, "stone times 6.35" gets you there.
The most common mistake is forgetting that British weights are usually given as stone-and-pounds, not decimal stone. "10 st 7 lb" is not 10.7 stone — the 7 pounds is 7/14 = 0.5 stone, making it 10.5 st (66.7 kg). Convert the pounds to a fraction of a stone (or to kg separately) before multiplying, or you will be off by several kilograms.
Frequently asked questions
How do you convert stone to kilogram?
Multiply the number of stones by 6.350293 to get kilograms. For example, 1 st = 6.350293 kg.
What is 1 stone in kilograms?
1 stone equals 6.350293 kilograms (1 st = 6.350293 kg).
How many stones are in 1 kilogram?
There are 0.157473 stones in 1 kilogram.
Is this converter free and private?
Yes. It runs entirely in your browser, so your inputs never leave your device, there is no sign-up, and it works offline once loaded.
Are the conversions exact?
Conversions use internationally defined factors and are exact where the definitions are exact (for example, 1 inch = 2.54 cm). Displayed results are rounded for readability.
People also ask
How many kg is 10 stone?
10 stone equals 63.50293 kg (10 × 6.350293). Rounded, that's about 63.5 kg.
What is 12 stone in kg?
12 stone is 76.2 kg (12 × 6.350293 = 76.203516 kg).
How do I convert 11 stone 7 pounds to kg?
Convert the pounds first: 7 lb is 0.5 stone, so 11 st 7 lb = 11.5 stone. Multiply by 6.350293 to get about 73.0 kg.
Is 70 kg a lot in stone?
70 kg is about 11.02 stone (70 × 0.157473), or roughly 11 stone exactly. Whether that's 'a lot' depends entirely on height and build.
How many pounds are in a stone?
There are exactly 14 pounds in one stone, which is why one stone equals 14 × 0.45359237 = 6.350293 kg.
What is the formula to convert stone to kilograms?
Multiply the stone value by 6.350293. So kg = stone × 6.350293, for example 8 st × 6.350293 = 50.8 kg.
Why does the UK still use stone for body weight?
It's a cultural convention — the UK officially uses the metric system, but stone-and-pounds remains the everyday way people describe their own weight, even though hospitals and scientists use kilograms.
How many kg is 14 stone?
14 stone equals 88.9 kg (14 × 6.350293 = 88.904102 kg).
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