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
- Type the number of stone into the Stone field. Decimals such as 5.5 are fine.
- Read the answer in Kilograms – it updates as you type, with no button to press.
- To convert the other way, type into Kilograms and the stone are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only st ⇄ kg. Need a different unit? Use the general weight converter, where you can choose any “from” and “to” unit.
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. Results are calculated at full precision and rounded only for display (up to eight decimal places, with very large or small values shown in scientific notation).
How to convert stone to kilograms
- Write down the value in stone, for example 11 st.
- Multiply by the conversion factor 6.3502932 (because 1 stone = 6.3502932 kg).
- 11 × 6.3502932 = 69.853225 kg.
- To go back from kilograms to stone, divide by 6.3502932 – or multiply by 0.15747304.
st to kg conversion table
| Stone | Kilograms | Kilograms | Stone |
|---|---|---|---|
| 6 st | 38.101759 kg | 1 kg | 0.15747304 st |
| 8 st | 50.802345 kg | 2 kg | 0.31494609 st |
| 9 st | 57.152639 kg | 5 kg | 0.78736522 st |
| 10 st | 63.502932 kg | 10 kg | 1.5747304 st |
| 11 st | 69.853225 kg | 20 kg | 3.1494609 st |
| 12 st | 76.203518 kg | 50 kg | 7.8736522 st |
| 13 st | 82.553811 kg | 100 kg | 15.747304 st |
| 14 st | 88.904105 kg | 1,000 kg | 157.47304 st |
| 15 st | 95.254398 kg | ||
| 16 st | 101.60469 kg | ||
| 18 st | 114.30528 kg | ||
| 20 st | 127.00586 kg |
What is a stone?
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.
What is a kilogram?
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.
Common mistakes to avoid
Confusing fluid ounces (volume) with ounces (weight), using troy ounces for food or regular ounces for gold, and mixing u.s. short tons, uk long tons and metric tonnes.
Formula
1 st = 6.3502932 kg1 kg = 0.15747304 stkg = st × 6.3502932Worked example
Inputs — Stone: 11 st.
Results — Kilograms = 69.85322498 kg.
Frequently asked questions
How many kg is 11 stone?
About 69.85 kg.
How many kg in a stone?
6.35029318 kg.
How do I convert stone to kilograms?
Multiply the number of stone by 6.3502932. For example, 11 st × 6.3502932 = 69.853225 kg.
How do I convert kilograms back to stone?
Divide by 6.3502932 (or multiply by 0.15747304), or simply type the value into the kilograms field above.
What is 10 st in kilograms?
10 st = 63.502932 kg.
What is 20 st in kilograms?
20 st = 127.00586 kg.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between stone and kilograms. To pick any weight unit, use the general weight converter linked under Related calculators.
What formula does the Stone to kg Converter use?
1 st = 6.3502932 kg.