Stone to Kilograms Converter
1 stone = 6.35029 kilograms
Conversion formula
kilograms = stone x 6.35029
To convert stone to kilograms, multiply by 6.35029. One stone is defined as exactly 14 pounds, and since 1 lb = 0.45359237 kg, one stone = 14 x 0.45359237 = 6.35029318 kg.
Stone to Kilograms Table
| Stone (st) | Kilograms (kg) |
|---|---|
| 7 | 44.4521 |
| 8 | 50.8023 |
| 9 | 57.1526 |
| 10 | 63.5029 |
| 11 | 69.8532 |
| 12 | 76.2035 |
| 13 | 82.5538 |
| 14 | 88.9041 |
| 15 | 95.2544 |
| 20 | 127.006 |
1 stone in every weight unit
| Kilograms | 6.35029 kg |
| Grams | 6,350.29 g |
| Milligrams | 6,350,290 mg |
| Micrograms | 6,350,290,000 ug |
| Metric Tons | 0.00635029 t |
| Pounds | 14 lb |
| Ounces | 224 oz |
| US Tons | 0.007 ton |
| Imperial Tons | 0.00625 long ton |
About Stone to Kilograms
The stone is a unit of weight primarily used in the United Kingdom and Ireland for expressing body weight. One stone equals 14 pounds or 6.35029 kilograms.
When a British person says "I weigh 11 stone," they mean 69.85 kg or about 154 lbs. The average UK adult male weighs roughly 13 stone 3 lbs (83.6 kg), while the average female weighs about 11 stone (69.9 kg).
British medical records and health guidelines often use stone. The NHS BMI calculator accepts weight in stone and pounds. A healthy BMI range for a 5'10" person corresponds to roughly 9 stone 4 lbs to 12 stone 8 lbs (58.9 to 79.8 kg).
The stone has medieval origins, historically used for trading wool and agricultural products. While most countries abandoned it during metrication, it remains deeply embedded in British and Irish culture. You'll hear it in casual conversation, doctor's offices, boxing weigh-ins (in the UK), and horse racing.
MMA and boxing in the UK often list fighters' weights in stone. A light heavyweight is about 12 stone 7 lbs (79.4 kg), while a heavyweight is over 14 stone 4 lbs (90.7 kg).
For quick conversion, multiply stone by 6.35 or simply multiply by 6 and add half a stone's worth (about 3 kg).
Frequently Asked Questions
How many kg is 10 stone?
10 stone equals 63.503 kg (approximately 63.5 kg). This is also 140 pounds.
What is a stone in weight?
A stone is a British unit of weight equal to 14 pounds or 6.35029 kg. It is mainly used in the UK and Ireland for expressing body weight.
How do I convert stone and pounds to kg?
Convert stone to pounds (multiply by 14), add the remaining pounds, then multiply the total by 0.4536. For example, 11 stone 7 lbs = 161 lbs x 0.4536 = 73.0 kg.
Why does the UK use stone for weight?
The stone dates back to the medieval wool trade and became standard for body weight in British culture. Despite metrication in the 1970s, the stone persists in everyday British and Irish speech.