Stone to Kilogram Converter
Free Stone kilogram Converter for volume & weight units. Enter a value to see equivalent measurements across systems. Get results you can export or share.
Reviewed for accuracy by Manoj Kumar, Mathematics Educator
Stone to Kilogram Converter
Calculator
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Formula: kg = stone x 6.35029 | stone = kg / 6.35029 | 1 stone = 14 lb
Worked example โ 12 st 7 lb = 79.38 kg
Formula
kg = stone x 6.35029 | stone = kg / 6.35029 | 1 stone = 14 lb
One stone equals exactly 14 avoirdupois pounds or 6.35029318 kilograms. To convert stone to kilograms, multiply by 6.35029. To convert kilograms to stone, divide by 6.35029. For mixed stone-and-pounds notation, convert the stone and pound portions separately to kilograms and add them together.
Worked Examples
Example 1: Body Weight Conversion
Problem:Convert 12 stone 7 pounds to kilograms.
Solution:Stone to kg: 12 x 6.35029 = 76.2035 kg Pounds to kg: 7 x 0.453592 = 3.1751 kg Total: 76.2035 + 3.1751 = 79.3786 kg
Result:12 st 7 lb = 79.38 kg
Example 2: Metric to Imperial
Problem:Convert 90 kilograms to stone and pounds.
Solution:Stone: 90 / 6.35029 = 14.1726 st Whole stone: 14 Remainder: 0.1726 x 14 = 2.42 lb Total: 14 stone 2.42 pounds
Result:90 kg = 14 st 2.42 lb
Frequently Asked Questions
How many kilograms are in one stone?
One stone is exactly equal to 6.35029 kilograms. The stone is a traditional British unit of weight that equals 14 pounds. To convert stone to kilograms, multiply the number of stones by 6.35029. For example, 10 stone equals 63.5029 kilograms. This unit is still commonly used in the UK and Ireland for measuring body weight.
How do I convert kilograms to stone and pounds?
To convert kilograms to stone, divide the kilogram value by 6.35029. The whole number is the stone value, and the decimal remainder multiplied by 14 gives the extra pounds. For example, 80 kg divided by 6.35029 equals 12.598 stone, which is 12 stone and 8.37 pounds (0.598 x 14 = 8.37). This mixed notation is the standard way body weight is expressed in the UK.
Why is the stone still used as a unit of measurement?
The stone persists primarily in the UK and Ireland as a customary unit for body weight despite the metric system being officially adopted. Cultural habit and tradition keep it in everyday use, similar to how Americans use pounds rather than kilograms. British media, healthcare providers, and fitness industries commonly reference weight in stone and pounds. The unit dates back to at least the 14th century when it was standardized at 14 pounds.
Is a stone the same weight everywhere?
The modern stone is standardized at exactly 14 avoirdupois pounds (6.35029 kg) everywhere it is used. Historically, the stone varied by commodity and region, ranging from 4 to 26 pounds depending on what was being weighed. The 14-pound standard was fixed by the British Weights and Measures Act of 1835. Today, when people refer to a stone, they always mean 14 pounds regardless of context.
Why do UK doctors and gyms record weight in stone but prescriptions in kilograms?
The dual system reflects two different audiences with different needs. Everyday conversation and bathroom scales in the UK and Ireland use stone and pounds because that is the culturally familiar unit people grew up with, similar to how Americans think in pounds rather than kilograms. Clinical dosing, however, is calculated in kilograms because medical formulas (drug doses per kilogram of body weight, BMI, IV fluid rates) are standardized internationally in metric units for patient safety and consistency across countries. A GP's surgery in London will typically ask your weight in stone for conversation but records and calculates from the kilogram figure on your chart.
References
Reviewed for accuracy by Manoj Kumar, Mathematics Educator ยท Editorial policy
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