Convert stone to kilograms

Formula: kg = st × 6.3503

st to kg quick reference table

Everyday st values, converted

• 10 st = 63.5029 kg — a body weight often quoted in the UK.
• 12 st = 76.2035 kg — another common UK body-weight figure.

Where st to kg comes up

Weight conversions show up at the gym, at the airline check-in desk, in recipes written for another country and at the doctor's office. Scales in one country are almost never labelled in the other country's unit, which is why the same figure has to be converted repeatedly.

Doing st to kg in your head

Multiply by 6.35 for a close estimate; the calculator above keeps the full factor of 6.3503.

Precision and rounding

One stone is exactly 6.3503 kilograms under the current definitions of both units, so the only judgement call is how many digits you keep. Two decimal places is already finer than most household scales and tape measures can read, while engineering and medical work usually keeps the full factor and rounds once at the end rather than at every step.