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.
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\nPounds to kg: 7 x 0.453592 = 3.1751 kg\nTotal: 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\nWhole stone: 14\nRemainder: 0.1726 x 14 = 2.42 lb\nTotal: 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.
Can I use Stone to Kilogram Converter on a mobile device?
Yes. All calculators on NovaCalculator are fully responsive and work on smartphones, tablets, and desktops. The layout adapts automatically to your screen size.
What formula does Stone to Kilogram Converter use?
The formula used is described in the Formula section on this page. It is based on widely accepted standards in the relevant field. If you need a specific reference or citation, the References section provides links to authoritative sources.