Stone to Kilograms Converter

About the st to kg calculation

One stone is exactly 6.3503 kilograms, so converting between them is a single multiplication. Enter any value above and the result updates as you type. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK. The SI base unit of mass, and how bodyweight is quoted in most of the world.

Formula

kg = st × 6.3503

1 st = 6.3503 kg
1 kg = 0.157473 st

Worked example

To convert 11 st, multiply by 6.3503: 11 × 6.3503 = 69.8532 kg.

Frequently asked questions

How many kilograms are in a stone?

There are 6.3503 kilograms in one stone. To convert any amount, multiply the number of stone by 6.3503.

How do I convert kilograms back to stone?

Divide instead of multiplying, or equivalently multiply by 0.157473. One kilogram is 0.157473 stone.

Is this conversion exact?

Yes. Since the international agreement of 1959, the relationship between stone and kilograms is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.

Is there anything that catches people out here?

A stone is exactly 14 pounds. British bodyweight is usually stated as "11 stone 4", meaning 11 stone plus 4 pounds — not 11.4 stone.

Sources

• NIST Special Publication 811 — Guide for the Use of the International System of Units