Stones (st) to Kilograms (kg) Conversion
Stones
The stone is a unit of mass equal to exactly 14 pounds (approximately 6.35 kilograms), used almost exclusively in the United Kingdom and Ireland for expressing human body weight. Standardised by the Weights and Measures Act of 1835, the stone persists in British popular culture and medical contexts despite not being part of the SI system.
Kilograms
The kilogram is the SI base unit of mass. From 1889 to 2019, it was defined by the International Prototype of the Kilogram — a physical cylinder of platinum-iridium alloy stored near Paris. In 2019, the kilogram was redefined in terms of Planck's constant (h = 6.62607015 × 10⁻³⁴ J·s), making it the first base unit defined entirely by a fundamental constant of nature. This eliminated the risk of the kilogram gradually changing mass due to contamination of the physical prototype.
| Stones (st) | Kilograms (kg) |
|---|---|
| 0.1 st | 0.635 kg |
| 1 st | 6.3503 kg |
| 2 st | 12.7006 kg |
| 3 st | 19.0509 kg |
| 5 st | 31.7515 kg |
| 10 st | 63.5029 kg |
| 20 st | 127.0059 kg |
| 30 st | 190.5088 kg |
| 50 st | 317.5147 kg |
| 100 st | 635.0293 kg |
| 1000 st | 6,350.2932 kg |
Frequently Asked Questions (FAQ)
How many kilograms are in 1 stones?
1 stones (st) is exactly 6.3503 kilograms (kg).
How do I convert stones to kilograms?
Multiply the value in stones by 6.3503 to get the result in kilograms. Or use the converter above — type any number and see the result instantly.