How to convert stone to kilograms
To convert a measurement in stone to kilograms, multiply the value by 6.350293. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 st to kilograms: 5 × 6.350293 = 31.751466 kg.
What is a stone?
A stone is a British imperial unit of mass equal to 14 pounds or exactly 6.35029318 kilograms. The stone was historically used across Europe with regionally varying values before Britain standardized it at 14 pounds. It remains in everyday use in the UK and Ireland for body weight despite metrication.
Common uses of stone include: Body weight in the UK and Ireland; Weigh-ins for sports and fitness in Britain; Historical and livestock weight references; Everyday conversational weight in the British Isles.
What is a kilogram?
A kilogram is the SI base unit of mass, equal to 1,000 grams or approximately 2.205 pounds. Originally defined in 1795 as the mass of one liter of water, the kilogram was fixed by a platinum-iridium cylinder from 1889 until 2019, when it was redefined in terms of the Planck constant. It is the only SI base unit whose name carries a prefix.
Common uses of kilograms include: Body weight in most countries; Grocery and produce pricing (price per kg); Shipping and freight weight; Scientific and laboratory mass measurements.
Stone to kilograms worked examples
Here are some common values converted:
1 st = 6.350293 kg 5 st = 31.751466 kg 10 st = 63.502932 kg 50 st = 317.514659 kg 100 st = 635.029318 kg
Frequently asked questions
How many kilograms are in one stone?
One stone (st) equals 6.350293 kilograms (kg). Multiply any value in stone by 6.350293 to convert to kilograms.
How do I convert stone to kilograms?
Multiply the value in stone by 6.350293. For example, 5 st × 6.350293 = 31.751466 kg.
How do I convert kilograms to stone?
Multiply the value in kilograms by 0.157473044418, or divide by 6.350293. Use the swap button on the converter above to reverse the direction.
Is the stone to kilogram conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for stone to kilograms?
The formula is: kg = st × 6.350293. This comes from the definition of both units relative to the kilogram.