Kilograms to Stones
Convert kilograms to stones instantly — one kilogram is 0.157473 stones.
| Kilograms | Stones |
|---|---|
| 1 kg | 0.157473 st |
| 2 kg | 0.314946 st |
| 3 kg | 0.472419 st |
| 5 kg | 0.787365 st |
| 10 kg | 1.57473 st |
| 25 kg | 3.936826 st |
| 50 kg | 7.873652 st |
| 100 kg | 15.747304 st |
How to use
- Enter a value in the Kilograms field.
- The Stones figure appears immediately — no button to press.
- Typing in the Stones field converts back to Kilograms the same way.
- Use the reference table for the values that come up most often.
Kilograms to Stones formula
To convert kilograms to stones, multiply by 0.157473044.
st = kg × 0.157473044
Why this factor: the kilogram and the stone are both defined against the kilogram, so dividing one definition by the other gives 0.157473044 directly. Both definitions are set out in full below.
To go the other way, divide by 0.157473044 — or use the Stones to Kilograms converter, which is the same calculation reversed.
Worked example
Given 150 kg, multiplying by 0.157473044 yields 23.620957 st.
150 kg × 0.157473044 = 23.620957 st
The converter above does this for any value you type, in either direction.
What is a kilogram?
The kilogram is the SI base unit of mass — the reference for every other mass unit.
Definition: Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.
Where it is used: Universal in science, trade and everyday weighing outside the United States.
What is a stone?
A stone is fourteen pounds, still the customary unit for body weight in Britain and Ireland.
Definition: Fourteen avoirdupois pounds, so exactly 6.35029318 kilograms.
Where it is used: Personal body weight in the UK and Ireland, where weight is usually given as stones and pounds.
Worth knowing: Effectively unused in the United States, where body weight is quoted in pounds alone.
Kilograms vs Stones
The kilogram is an SI unit while the stone is an imperial unit. That is why the factor between them is not a round number: the two systems were defined independently and only later tied together by exact agreement.
Frequently asked questions
How many stones are in a kilogram?
One kilogram equals 0.157473044 stones.
What is the formula to convert kilograms to stones?
Multiply the number of kilograms by 0.157473044. To reverse it, divide by 0.157473044 instead.
How do I convert stones back to kilograms?
Divide by 0.157473044, which is the same as multiplying by 6.35029318.
How many stones are in 10 kilograms?
10 kg works out to 1.57473 st.
Is there anything to watch out for with stones?
Effectively unused in the United States, where body weight is quoted in pounds alone.
How is the kilogram defined?
Since 2019 the kilogram has been defined by fixing the Planck constant at exactly 6.62607015×10⁻³⁴ joule-seconds, retiring the physical platinum-iridium cylinder that defined it for 130 years.