KG to Stone Converter

Convert kilograms to stone (kg to st)

To convert kilograms to stone, divide the value in kilograms by 6.35029318 — the same as multiplying by about 0.157473. It lets you express a metric weight the way people in the UK and Ireland usually talk about body weight. This kg to stone converter works both ways: type kilograms or stone into either box above and the other box, the worked formula and the chart below update as you type.

The kilogram (kg) is the SI base unit of mass. Since 2019 it has been defined through the Planck constant instead of a platinum-iridium cylinder kept near Paris. Kilograms are used for body weight, groceries, luggage allowances and shipping in almost every country. One kilogram is 0.157473 stone.

The stone (st) is a British unit of weight equal to 14 pounds, or exactly 6.35029318 kilograms. Going the other way, one stone equals 6.35029 kilograms. It is still the usual way to talk about body weight in the UK and Ireland — someone might weigh 11 st 4 lb — but it is rarely used anywhere else.

How to convert kg to stone with this tool

1. Type a number into the Kilograms (kg) box — it starts at 60 kg as an example.
2. Read the answer in the Stone (st) box and in the result panel, which also shows the formula with your number.
3. To go the other way, type into the stone box, or press the swap button to open the Stone to KG converter with your value carried over.
4. Choose how many decimal places you want, or tap a quick value such as 50 kg, 60 kg, 70 kg.
5. Press Copy result to paste the conversion into a message, spreadsheet or note.

KG to Stone converter features

KG to Stone formula

The formula is st = kg ÷ 6.35029318. It is exact because a stone is 14 pounds of 0.45359237 kg, which makes it exactly 6.35029318 kilograms.

The reverse formula is kg = st × 6.35029318 — or use the Stone to KG converter. Three worked examples:

• A 60 kg runner: 60 kg ÷ 6.35029318 = 9.4484 st
• A 75 kg adult: 75 kg ÷ 6.35029318 = 11.8105 st
• A 100 kg rugby player: 100 kg ÷ 6.35029318 = 15.7473 st

Writing weight in stones and pounds

In the UK a weight such as 11.43 st is normally said as “11 stone 6” — 11 stone and 6 pounds — because a stone is 14 lb, not 10. Read the decimal part as fourteenths, not tenths.

For example, 72.575 kg = 11.4286 st, which the line under the result shows as about 11 st 6 lb.

KG to Stone quick reference

The values people look up most often, worked out with the exact factor:

• 1 kg = 0.157473 st
• 1 st = 6.35029 kg
• 50 kg = 7.8737 st
• 60 kg = 9.4484 st
• 70 kg = 11.0231 st
• 80 kg = 12.5978 st

Quick tip: Divide by 6.35 — or multiply by 0.157 — for a quick estimate: 80 kg × 0.157 ≈ 12.6 st, versus the exact 12.5978 st.

Related conversions: KG to LBS, LBS to KG and the full weight converter.

KG to Stone conversion table

Values in stone are rounded to 4 decimal places (more for very small numbers). For any value not listed, type it into the converter above.