Stone to Kg Converter
Convert stone to kilograms with our free tool. Includes a handy reference table for common stone to kg conversions.
Formula
kg = st × 6.35029
Common Conversions
How to Convert Stone to Kilograms
1 stone = 6.35 kg. Multiply stone by 6.35 to get kilograms. So 12 stone × 6.35 = 76.2 kg. The stone has been defined as exactly 14 lbs since 1835, and 14 lbs = 6.35029318 kg under the modern international pound. Stone is still standard for body weight in the UK and Ireland but obsolete in most other countries.
Stone-and-pounds (e.g. '12 stone 4 pounds') is a hybrid unit used commonly in the UK. To convert stone-and-pounds to kg: multiply stones by 6.35, multiply remaining pounds by 0.4536, add together. So 12 st 4 lb = (12 × 6.35) + (4 × 0.4536) = 76.2 + 1.81 = 78.01 kg.
Common Stone to Kilograms Conversions
| Stone | Kilograms |
|---|---|
| 8 st | 50.80 kg |
| 9 st | 57.15 kg |
| 10 st | 63.50 kg |
| 11 st | 69.85 kg |
| 12 st | 76.20 kg |
| 13 st | 82.55 kg |
| 14 st | 88.90 kg |
| 15 st | 95.25 kg |
Frequently Asked Questions
Why does the UK use stone for body weight?
Tradition more than logic. Stone was historically used across Europe for weighing produce; the UK retained it for body weight after metrification in the 1970s. Most UK gym equipment now shows kg too, but stone remains the conversational norm.
Do other countries use stone?
Mostly just the UK and Ireland for body weight. Australia, Canada, the US and most of Europe use kg or lbs. American doctors universally use lbs; UK doctors often record both stone and kg.
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