Stone to Kilograms
A stone is 14 pounds, about 6.35 kilograms, the traditional unit for body weight in the UK and Ireland. The kilogram is the SI base unit of mass, defined today by the fixed value of the Planck constant. 1 st equals ≈6.35029 kg, so converting between them is a matter of multiplying by that fixed factor — type any value into the converter below and both sides update instantly as you type.
Both units belong to mass, measured here against mass's base unit (kg) — every other mass unit on this site converts through that same reference point, which is why the table below can also be read as a quick cross-check against nearby values.
Formula
kg = st × ≈6.35029
st = kg × ≈0.157473
Worked example: 5 st × ≈6.35029 = ≈31.7515 kg.
Conversion table
| Stone (st) | Kilogram (kg) |
|---|---|
| 1 st | ≈6.35029 kg |
| 2 st | ≈12.7006 kg |
| 3 st | ≈19.0509 kg |
| 5 st | ≈31.7515 kg |
| 10 st | ≈63.5029 kg |
| 20 st | ≈127.006 kg |
| 25 st | ≈158.757 kg |
| 50 st | ≈317.515 kg |
| 100 st | ≈635.029 kg |
| 250 st | ≈1,587.57 kg |
| 500 st | ≈3,175.15 kg |
| 1,000 st | ≈6,350.29 kg |
Frequently asked
- How many Kilograms in a stone?
- 1 st equals ≈6.35029 kg.
- How do I convert Stone to Kilograms?
- Multiply the value in st by ≈6.35029 to get kg. The converter above does this instantly as you type.
- Is the conversion exact?
- Yes — Stone and Kilogram are both defined by a fixed conversion factor to mass's base unit (kg), so the result shown is exact to the precision displayed, not an approximation.