# Stones to Kilograms (st to kg) Source: https://www.unitconvertercalculator.com/weight/stones-to-kilograms/ **1 st = 6.35029318 kg** One stone equals exactly 6.35029 kilograms or 14 pounds. This conversion is essential for British and Irish travelers, medical professionals, and anyone converting body weight between the UK's stone-based system and the metric system used in most of the world. ## Formula Apply the conversion factor ## Conversion Table | Stones (st) | Kilograms (kg) | |---|---| | 0.5 st | 3.17514659 kg | | 1 st | 6.35029318 kg | | 2 st | 12.70058636 kg | | 3 st | 19.05087954 kg | | 5 st | 31.7514659 kg | | 7 st | 44.45205226 kg | | 8 st | 50.80234544 kg | | 9 st | 57.15263862 kg | | 10 st | 63.5029318 kg | | 11 st | 69.85322498 kg | | 12 st | 76.20351816 kg | | 13 st | 82.55381134 kg | | 14 st | 88.90410452 kg | | 15 st | 95.2543977 kg | | 16 st | 101.60469088 kg | | 17 st | 107.95498406 kg | | 18 st | 114.30527724 kg | | 19 st | 120.65557042 kg | | 20 st | 127.0058636 kg | | 25 st | 158.7573295 kg | | 30 st | 190.5087954 kg | | 40 st | 254.0117272 kg | | 50 st | 317.514659 kg | ## Units ### Stone (st) A British unit of mass equal to 14 pounds or approximately 6.35 kilograms. Commonly used in the UK and Ireland for body weight. ### Kilogram (kg) The base unit of mass in the International System of Units (SI). Equal to 1000 grams. Used worldwide for everyday weighing and commerce. ## Background A person weighing 12 stone is about 76.2 kg (168 lbs). When a British person visits a doctor in continental Europe, they need to convert their stone weight to kilograms. Fitness apps and smart scales can display weight in stone, kilograms, or pounds. British bathroom scales often show stone alongside kilograms to accommodate both systems. ## Good to Know In the UK, asking someone's weight in kilograms often gets a blank stare. Most Britons know their weight only in stone and pounds. NHS records are transitioning to kilograms, but the cultural habit persists. ## FAQ ### How many kilograms are in 1 stone? One stone equals exactly 6.35029318 kilograms. For quick mental math, multiply stone by 6.35 or remember that 1 stone is roughly 6 kg and a third. ### How do I convert stone to kilograms? Multiply the number of stone by 6.35029. If the weight includes pounds, first convert the total to stone (divide remaining pounds by 14), then multiply by 6.35. For example, 11 stone 7 lbs = 11.5 stone × 6.35 = 73.03 kg. ### Why does the UK use stone for body weight? The stone has been used in the British Isles since medieval times. Although the UK adopted the metric system for trade in 1985, stone remained the cultural standard for personal weight because it was deeply embedded in everyday conversation and bathroom scales. ## Non-Frequently Asked Questions ### Why do British people weigh themselves in stones? Are they cavemen? The stone (14 pounds / 6.35 kg) predates the metric system by centuries. British people use stones because it gives smaller, friendlier numbers. Saying 'I weigh 12 stone' sounds better than 'I weigh 76.2 kilograms' or '168 pounds.' It is the unit of polite vagueness. ### If I throw a stone, does it weigh one stone? Almost certainly not. A rock you can comfortably throw weighs about 0.5 to 2 kg. One stone (the unit) is 6.35 kg, or about 14 pounds. 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