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 | 0.635029318 kg |
| 1 st | 6.35029318 kg |
| 2 st | 12.70058636 kg |
| 3 st | 19.05087954 kg |
| 5 st | 31.7514659 kg |
| 10 st | 63.5029318 kg |
| 20 st | 127.0058636 kg |
| 30 st | 190.5087954 kg |
| 50 st | 317.514659 kg |
| 100 st | 635.029318 kg |
| 1000 st | 6350.29318 kg |