Stone to kg Converter

One stone is 14 lb or about 6.35 kg. Use it to translate UK body weights into kilograms for medical or fitness apps.

How to use the Stone to kg Converter

1. Type the number of stone into the Stone field. Decimals such as 5.5 are fine.
2. Read the answer in Kilograms. It updates as you type, with no button to press. The same amount is also shown in lb.
3. To go from kilograms back to stone, type into the Kilograms field instead. Every field also has a unit menu with all 19 weight units, for example g, mg, µg, dag, t, lb, oz, US ton, UK ton, gr, dr, ozt.

Results update as you type, and everything is calculated in your browser.

How it works

Both units measure weight, so they are always in the same ratio: one stone equals 6.3502932 kilograms. The calculator multiplies the number of stone you type by 6.3502932 to give kilograms, and when you type into the kilograms field it divides by the same factor to give stone. Because the ratio never changes, doubling the stone always doubles the kilograms, for example 22 st is 139.70645 kg.

How to convert stone to kilograms

1. Write down the value in stone, for example 11 st.
2. Multiply by the conversion factor 6.3502932 (because 1 stone = 6.3502932 kg).
3. 11 × 6.3502932 = 69.853225 kg.
4. To go back from kilograms to stone, divide by 6.3502932, or multiply by 0.15747304.

st to kg conversion table

Weight units explained

Stone (st)

The stone is 14 pounds, about 6.35 kg. People in the UK and Ireland still commonly give their body weight in stones and pounds, such as 11 st 4 lb.

Kilogram (kg)

The kilogram is the SI base unit of mass. Since 2019 it has been defined through the Planck constant rather than a platinum-iridium cylinder kept near Paris.

Quick mental conversion

For a fast estimate, multiply stone by about 6.4 to get kilograms; the error is about 0.8%. Use the calculator above when you need the exact figure.