UrbiTools

Stone to kg Converter

Convert stones to kilograms and back — 6.35029 kg per stone (1 stone = 14 lb). Everything runs instantly in your browser; nothing is uploaded.

Convert stones ⇄ kilograms

63.5029 kg
10 st = 63.5029 kg (1 stone = 14 lb (exact))

Formula: 10 st × 6.35029 = 63.5029 kg

How the stone to kg conversion works

The converter applies kg = stones × 6.35029. The stone is defined as exactly 14 avoirdupois pounds, and the international pound is exactly 0.45359237 kg — so one stone is 14 × 0.45359237 = 6.35029318 kg, rounded to 6.35029. Going the other way, stones = kg ÷ 6.35029.

Worked example: a scale reading of 10 stone 5 lb is 10 + 5/14 ≈ 10.357 stone, which is 10.357 × 6.35029 ≈ 65.77 kg. And 75 kg is 75 ÷ 6.35029 ≈ 11.81 stone (about 11 st 11 lb).

To say a weight the British way, split the decimal: 11.81 stone is 11 st plus 0.81 × 14 ≈ 11 lb — "11 stone 11". For pounds alone, see our kg to lbs converter.

stone to kg questions

How many kg are in a stone?
Exactly 6.35029 kg. A stone is defined as 14 avoirdupois pounds, and a pound is 0.45359237 kg — so 14 × 0.45359237 = 6.35029318 kg, conventionally rounded to 6.35029.
How do I convert stones to kg?
Multiply by 6.35029: kg = stones × 6.35029. So 10 stone is 10 × 6.35029 = 63.5029 kg, and 12 stone is 76.2035 kg. Type any figure above.
How much is 11 stone in kg?
69.8532 kg (11 × 6.35029). Handy benchmarks: 10 st = 63.5 kg, 12 st = 76.2 kg, 15 st = 95.25 kg, 20 st = 127 kg.
How do I convert kg back to stones?
Divide by 6.35029: stones = kg ÷ 6.35029. So 70 kg is 70 ÷ 6.35029 ≈ 11.02 stone, and 80 kg is ≈ 12.6 stone. Switch the direction above to do it.
Why does the UK use stones for body weight?
The stone has been a British unit of body weight for centuries — bathroom scales in the UK still show stones and pounds, and people say "10 stone 5" rather than 65.8 kg. The fractional part is always in pounds (0–13), never in decimal stones, so 10.5 stone is 10 st 7 lb.

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Sources & official guidance

Estimate only — the stone is 14 lb by definition; conversions are exact. See our disclaimer.