2 st = 12.7006 kg (stone → kilogram)
2 st = 12.7006 kg
2 stones (st) equals 12.7006 kilograms (kg). The conversion uses the exact factor 6.35029: 2 × 6.35029 = 12.7006.
Kilograms = Stones × 6.35029How 2 stones compares to its arithmetic neighbours, converted to kilograms.
| Relation | stones | kilograms |
|---|---|---|
| ÷10 | 0.2 st | 1.27006 kg |
| ÷2 (half) | 1 st | 6.35029 kg |
| ×1 (this value) | 2 st | 12.7006 kg |
| ×2 (double) | 4 st | 25.4012 kg |
| ×5 | 10 st | 63.5029 kg |
| ×10 | 20 st | 127.006 kg |
Stones to kilograms multiplies by 6.35029 (1 st = 14 lb × 0.45359237 kg). A 12 st adult is 76.2 kg; an 11 st 7 lb weight is 73.0 kg. Convert the stones-and-pounds figure to all-pounds first (12 st 7 lb = 175 lb), then to kilograms — going via decimal stones works too but invites rounding slips. This is the conversion a UK patient makes to read a metric clinical scale, or to use international BMI tables that expect kilograms.
UK medical records and gym membership forms store weight in stones, but clinical calculations — BMI, drug dosing by body mass, physiotherapy load targets — require kilograms, so GP surgeries convert constantly: 10 st is 63.5 kg, 12 st is 76.2 kg, and 15 st is 95.25 kg. Because the exact factor is 6.35029318, clinical software keeps several decimal places even though patients only ever see the rounded stone-and-pound figure on their chart.
Start with your value in stones.
Multiply the stone value by 6.35029. This is the exact conversion factor from stones to kilograms.
The product is your value in kilograms. For example, 5 st × 6.35029 = 31.7515 kg.
The exact factor from stones to kilograms is 6.35029.
Kilograms = Stones × 6.35029
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Stones (st) | Kilograms (kg) |
|---|---|
| 0.1 st | 0.63503 kg |
| 0.25 st | 1.5876 kg |
| 0.5 st | 3.1751 kg |
| 1 st | 6.3503 kg |
| 1.5 st | 9.5254 kg |
| 2 st | 12.701 kg |
| 2.5 st | 15.876 kg |
| 3 st | 19.051 kg |
| 4 st | 25.401 kg |
| 5 st | 31.751 kg |
| 6 st | 38.102 kg |
| 7 st | 44.452 kg |
| 8 st | 50.802 kg |
| 9 st | 57.153 kg |
| 10 st | 63.503 kg |
| 12 st | 76.204 kg |
| 15 st | 95.254 kg |
| 18 st | 114.31 kg |
| 20 st | 127.01 kg |
| 25 st | 158.76 kg |
| 30 st | 190.51 kg |
| 35 st | 222.26 kg |
| 40 st | 254.01 kg |
| 45 st | 285.76 kg |
| 50 st | 317.51 kg |
| 60 st | 381.02 kg |
| 70 st | 444.52 kg |
| 75 st | 476.27 kg |
| 80 st | 508.02 kg |
| 90 st | 571.53 kg |
| 100 st | 635.03 kg |
| 120 st | 762.04 kg |
| 125 st | 793.79 kg |
| 150 st | 952.54 kg |
| 175 st | 1111.3 kg |
| 180 st | 1143.1 kg |
| 200 st | 1270.1 kg |
| 225 st | 1428.8 kg |
| 250 st | 1587.6 kg |
| 275 st | 1746.3 kg |
| 300 st | 1905.1 kg |
| 350 st | 2222.6 kg |
| 400 st | 2540.1 kg |
| 450 st | 2857.6 kg |
| 500 st | 3175.1 kg |
| 600 st | 3810.2 kg |
| 750 st | 4762.7 kg |
| 1000 st | 6350.3 kg |
| 2000 st | 12701 kg |
| 5000 st | 31751 kg |
An average adult man in the UK weighs 12–14 st. A medium-sized dog weighs about 3 st. In kilograms, that gives you: 1 st = 6.35029 kg, 10 st = 63.5029 kg, 100 st = 635.029 kg.
The stone (st) equals exactly 14 pounds (about 6.35 kg). It is still widely used in the United Kingdom and Ireland to state body weight, even though it is no longer legal for trade. The stone was originally a real stone used by merchants as a counterweight on balances; its weight varied by region and trade until standardized in the late 19th century.
The kilogram (kg) is the SI base unit of mass. Since the 2019 redefinition it is defined by fixing the Planck constant to exactly 6.62607015 × 10⁻³⁴ J·s, replacing the old International Prototype Kilogram artifact. In everyday use, the kilogram is the global standard for body weight, groceries, and engineering specifications.
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