Kg to stone converter

The rule

One stone is 14 pounds, and one pound is exactly 0.45359237 kilograms, so one stone is exactly 6.35029318 kg (UK Weights and Measures Act 1985 and NIST Handbook 44). To turn kilograms into stone, divide by 6.35029318. The whole number is the stone; multiply what is left by 14 to get the pounds.

Worked example

70 kg ÷ 6.35029318 = 11.0231 stone. The 0.0231 stone left over is 0.0231 × 14 = 0.3 lb, so 70 kg is 11 st 0.3 lb. Going back, 11 st 4 lb is 11 × 14 + 4 = 158 lb, and 158 × 0.45359237 = 71.6676 kg.

Typing stone and pounds

In the stone box you can write 11 st 4 lb, 11st 4, or simply 11 4 for 11 stone 4 pounds. A single number such as 11.5 is read as decimal stone, which is 11 st 7 lb.

Who uses stone

Stone is used for body weight in the UK and Ireland, often on bathroom scales and in doctors' notes alongside kilograms. It is not used for food or parcels, and it is rarely used in the US, Canada or Australia, where people weigh themselves in pounds or kilograms. For pounds only, see kg to lbs.

A quick check in your head

A stone is a little over 6.3 kg, so 10 stone is about 63.5 kg and 100 kg is about 15 st 10 lb.

Rounding

The answer is worked out from the exact definition, then shown to 4 decimal places (6 significant figures for numbers below 1). It says "exactly" only when nothing was rounded.