KG to Stone Converter

Type a number of kilograms and this converter shows the answer in stone instantly (1 kg = 0.157473 st). Below the converter you will find a ready-made kg to st table, and further down the formula with a worked example.

Hospital scales, gym equipment and diet apps report weight in kilograms, but many people in Britain and Ireland think of their weight in stone. Converting a reading of 80 kg gives 12.6 st, and the fractional part times 14 gives the pounds: 0.6 × 14 ≈ 8, so 12 st 8 lb. The table below lists common body weights so you can read them off directly.

How to use the KG to Stone tool

1. Enter the value in kilograms in the Value box. Decimals such as 40.5 are fine.
2. The result in stone appears straight away, rounded to six significant digits.
3. Check the formula line under the result to see exactly how it was calculated.
4. Press ⇄ to convert stone back to kilograms, or pick any other unit from the lists.
5. Use Copy result, or look up common values in the conversion table.

Why use ToolOrca KG to Stone

• Exact factor: 1 kg = 0.157473 st
• Conversion table: kg to st
• Formula and worked example included
• Instant result as you type
• Converts to every other weight unit too
• Free, private and works offline

How to convert kilograms to stone

The kilogram is the SI base unit of mass, defined since 2019 through the Planck constant. One stone is 14 pounds, which is exactly 6.35029318 kilograms. So 1 kg = 0.157473044 st, and 1 st = 6.35029318 kg exactly.

To convert kilograms to stone, divide the number of kilograms by 6.35029318. Multiplying by 0.157473 gives the same answer to six significant digits.

Worked example: 80 kg ÷ 6.35029318 = 12.5978 st.

Quick mental math for kg to st

Divide by 6.35, or multiply by 0.16 for a quick estimate: 70 kg × 0.16 = 11.2 st (exact 11.02 st). Then turn the decimal into pounds by multiplying by 14.

Need the opposite direction? Use the stone to kilograms converter, or switch units with the ⇄ button above.