Kilograms to Stone Conversion Formula
To convert kilograms (kg) to stone (st), divide the kilogram value by 6.35029318.
Stone (st) = Kilograms (kg) รท 6.35029318
One stone equals exactly 14 international avoirdupois pounds, or 6.35029318 kilograms.
Alternatively, multiply the weight in kilograms by approximately 0.1574730444 to calculate the equivalent value in stone.
Example: Convert 70 kilograms to stone
170 รท 6.35029318 โ 11.0231 stDivide
Result70 kg โ 11.02 stone
The result is expressed in decimal stones and rounded to two decimal places.
How to Convert Kilograms to Stone
Follow these three simple steps:
- Identify the weight in kilograms.
- Divide the kilogram value by 6.35029318.
- Express the result in stone (st).
Example: Convert 80 kilograms to stone
180 รท 6.35029318 โ 12.5978 stDivide
Result80 kg โ 12.60 stone
You can enter whole numbers or decimal values into the calculator above for more precise results.
Kilograms to Stone Conversion Table
The following table includes commonly used kilogram values, particularly those relevant to body-weight measurements. Results are rounded to two decimal places.
| Kilograms (kg) | Stone (st) |
|---|
| 1 kg | 0.16 st |
| 5 kg | 0.79 st |
| 10 kg | 1.57 st |
| 20 kg | 3.15 st |
| 30 kg | 4.72 st |
| 40 kg | 6.30 st |
| 45 kg | 7.09 st |
| 50 kg | 7.87 st |
| 55 kg | 8.66 st |
| 60 kg | 9.45 st |
| 65 kg | 10.24 st |
| 70 kg | 11.02 st |
| 75 kg | 11.81 st |
| 80 kg | 12.60 st |
| 85 kg | 13.39 st |
| 90 kg | 14.17 st |
| 95 kg | 14.96 st |
| 100 kg | 15.75 st |
| 110 kg | 17.32 st |
| 120 kg | 18.90 st |
Understanding Kilograms and Stone
What Is a Kilogram (kg)?
A kilogram is the SI base unit of mass and is widely used across the world to measure body mass, food products, packages, and other physical quantities.
1 kilogram = 1,000 grams
Kilograms are part of the metric system and are commonly used in scientific, medical, commercial, and everyday measurements.
What Is a Stone (st)?
A stone is a unit of mass traditionally used in Britain and Ireland. Today, it is most commonly encountered when people describe body weight.
1 stone = 14 pounds = 6.35029318 kilograms
For example, someone weighing 10 stone has a mass of approximately 63.50 kilograms.
The unit symbol for stone is st.
Kilogram vs. Stone: Key Differences
| Feature | Kilogram (kg) | Stone (st) |
|---|
| Measurement | Mass | Mass |
| Measurement system | SI (metric) | British imperial tradition |
| Equivalent in kilograms | 1 kg | 6.35029318 kg |
| Common use | Body mass, products, shipping | Primarily body weight |
| Relative size | Smaller unit | Larger unit |
One stone is approximately 6.35 times the mass of one kilogram.
How to Convert Kilograms to Stone and Pounds
In the United Kingdom, body weight is frequently expressed as a combination of stones and pounds rather than decimal stones.
Since 1 stone = 14 pounds, you can convert kilograms into both units using these steps:
- Divide the weight in kilograms by 6.35029318 to get decimal stones.
- Take the whole-number portion as the number of stones.
- Multiply the remaining decimal portion by 14 to obtain the remaining pounds.
Example: Convert 75 kilograms to stone and pounds
175 kg โ 11.8105 stConvert
2Whole stones = 11 stKeep whole
30.8105 ร 14 โ 11.35 lbRemainder ร 14
Result75 kg โ 11 st 11.35 lb
This format is commonly used for body-weight measurements in the UK.
Decimal Stone vs. Stone and Pounds
Decimal stones and mixed stone-and-pound measurements represent the same mass but use different notation.
- 11.5 st = 11 stone 7 pounds
- 11 st 5 lb = approximately 11.3571 decimal stone
Important11.5 st does not mean 11 stone 5 pounds. The decimal fraction represents a fraction of 14 pounds, not a direct pound count.
Quick Mental Math Trick
For a rough conversion from kilograms to stone, divide the kilogram value by 6.35.
- 50 kg โ 7.87 st
- 60 kg โ 9.45 st
- 70 kg โ 11.02 st
- 80 kg โ 12.60 st
- 90 kg โ 14.17 st
For an even quicker estimate, divide kilograms by 6.4. This is less accurate but can be convenient for mental calculations.
For precise results, use the calculator above.
Frequently Asked Questions
How many kilograms are in one stone?
One stone equals exactly 6.35029318 kilograms.
How do I convert kilograms to stone?
Divide the kilogram value by 6.35029318. For example, 70 kg is approximately 11.02 stone.
How many stone is 50 kg?
50 kilograms equals approximately 7.87 stone, or about 7 stone 12.2 pounds.
How many stone is 70 kg?
70 kilograms is approximately 11.02 stone, equivalent to about 11 stone 0.3 pounds.
Is one stone equal to 14 pounds?
Yes. One stone equals exactly 14 international avoirdupois pounds.
Is 10 stone equal to 60 kg?
No. Ten stone equals approximately 63.50 kilograms.
How do I convert stone back to kilograms?
Multiply the weight in stone by 6.35029318. For example, 12 st ร 6.35029318 = 76.20351816 kg.
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Conversion reference: The international avoirdupois pound is exactly 0.45359237 kg, and one stone contains 14 pounds. See NIST Handbook 44, Appendix C for the international pound definition.