stone to kg converter

How to convert stone to kilograms

A stone is exactly 14 international pounds. The pound is exactly 0.45359237 kg, so a stone is exactly 6.35029318 kg. That is the factor in the table, not a rounded 6.35 that someone later treats as exact. Ten stone is 63.503 kg. The stone is everyday body weight in the UK and Ireland and almost unused elsewhere. It is not a US unit. Hospitals that record kilograms and relatives who speak in stone are the reason this page exists.

A weight written as '11 stone' or '11 st 4 lb' that has to enter a metric record. Whole stones are the box on this page. If there are leftover pounds, convert them with the pounds page (pounds × 0.45359237) and add. Eleven stone 4 lb is 11 × 6.35029318 + 4 × 0.45359237.

Exact formula

Formulakilograms = stone × 6.35029318

kilograms = stone × 6.35029318 One st is 6.35029318 kg. Ten st is 63.5029318 kg. The worked example below uses that same conversion.

Conversion table

The stone column runs from 1 st (6.35 kg) through 30 st (190.51 kg).

Worked example: Stone to Kilograms

Eleven stone of body weight is 69.853 kg. A stone is exactly 14 international pounds, and the pound is 0.45359237 kg, so the stone is 6.35029318 kg. Twelve stone is 76.204 kg. Ten stone is 63.503 kg. The box wants decimal stone. '11.4' means 11.4 stone, not 11 stone 4 lb. Four leftover pounds are 4/14 stone. Hospitals that record kilograms and relatives who speak in stone are the reason to expand the pounds before you add. The US does not weigh people in stone.

Pitfalls for stone to kilograms

• 6.35 kg is a hair light of the defined 6.35029318 kg. On 20 stone the difference is several grams.
• A stone is 14 lb, not 16. Mixing it up with the pound's own 16 ounces is a different mistake, but people do it.
• The box wants decimal stone. '11.4' means 11.4 stone, not 11 stone 4 lb. Four pounds is 4/14 stone, about 0.286.
• Troy and metric 'stone' are not this unit. There is no second stone in the factor table.