Kilograms to stone:
divide by 6.35029

How many stone are in a kilogram?

One kilogram is 0.1574730444 stone. In the other direction, one stone is 6.35029318 kilograms. The stone is an imperial unit of 14 pounds, and since the pound is exactly 0.45359237 kg, the stone works out to 14 × 0.45359237 = 6.35029318 kg.

In the UK and Ireland, body weight is still commonly given in stone and pounds, while medical records, scales and most of the rest of the world use kilograms. Converting between them is the everyday job this page covers.

The kg to stone formula

1. 1Divide the kilograms by 6.35029318 to get decimal stone.
2. 2Keep the whole number as the stone.
3. 3Multiply the leftover decimal by 14 to get pounds.
4. 4Round the pounds to one decimal or a whole number.

Chart: kg to stone

These are decimal stone. A reading such as 7.8737 st means 7 stone plus 0.8737 × 14 = 12.2 pounds, so 50 kg is 7 st 12.2 lb.

More examples: 70 kg and 62 kg in stone and pounds

A weight of 70 kg is 70 ÷ 6.35029318 = 11.0231 stone, which is 11 st 0.3 lb, so almost exactly 11 stone. A weight of 62 kg is 9.7633 stone, and 0.7633 × 14 gives 10.7 pounds, so 62 kg is 9 st 10.7 lb.

Results like these are for tracking and comparing, not for diagnosis. Weight targets for health depend on many factors, so use any figures here as estimates and speak to a health professional about your own goals.

More examples: 60 kg, 100 kg and 10 kg

Not every weight comes out neatly. A weight of 60 kg is 9.4484 stone, which is 9 stone and 6.3 pounds. A weight of 100 kg is 15 st 10.5 lb, and 10 kg is 1.5747 stone, or 1 stone 8.0 pounds.

To check the work in the opposite direction, take 11 st 4 lb. That is 11 × 14 + 4 = 158 lb, and 158 × 0.45359237 = 71.67 kg. Multiplying pounds by 0.45359237 gives kilograms exactly, because that is the legal definition of the pound.

Do not round the stone figure too early. For 85 kg, the unrounded 13.3852 stone becomes 13 st 5.4 lb, whereas rounding to 13.4 first gives 13 st 5.6 lb. The small gap is harmless for casual use, but it is better to carry the extra digits until the last step.

Common mistakes when converting kg to stone

• Reading 13.4 stone as 13 stone 4 pounds. The decimal is a fraction of 14 pounds, so 0.4 stone is about 5.6 lb.
• Multiplying by 6.35 instead of dividing. A stone is heavier than a kilogram, so the stone number must be smaller.
• Treating a stone as 10 pounds. It is 14 pounds.
• Forgetting that US sources rarely use the stone, so check which pound-based unit a figure is in.