Quick Answer: Stones to Kilograms
One stone equals 6.35029318 kilograms (1 st = 6.35029318 kg).
Conversely, 1 kg = 0.157473044 st.
Formula: kg = st × 6.35029318
Worked examples
- 1 st = 6.35029318 kg
- 5 st = 31.7514659 kg
- 8 st = 50.8023454 kg
Method and limitations
To convert stones to kilograms, multiply the stone value by 6.35029318. One stone equals 14 pounds or approximately 6.35 kilograms. Calculations use full-precision constants; displayed values are rounded to at most 9 significant figures. Results are rounded for display only. Full precision is kept internally, so long chains of conversions do not accumulate rounding error. Where US customary and imperial units share a name (for example fluid ounces and gallons), this page uses the US customary definition and says so explicitly.
Each factor is exact by definition, derived from exact definitions, or a documented conventional value — see the methodology and sources.
Conversion Formula
To convert stones to kilograms, multiply the stone value by 6.35029318. One stone equals 14 pounds or approximately 6.35 kilograms.
Step-by-Step Conversion Guide
Follow these steps to convert stones to kilograms manually:
Start with your value in stones
Example: You want to convert 8 st
Apply the conversion formula
Use the formula: kg = st × 6.35029318
Calculate the result
8 st = 50.8023 kg
Verify your answer
Use our calculator above to double-check your manual calculation.
Quick Mental Math Tip
To convert stones to kilograms, multiply the stone value by 6.35029318. One stone equals 14 pounds or approximately 6.35 kilograms.
Common Conversions
| Stones (st) | Kilograms (kg) | Kilograms → Stones |
|---|---|---|
| 1 st | 6.35029 | 1 kg = 0.157473 st |
| 5 st | 31.7515 | 5 kg = 0.787365 st |
| 8 st | 50.8023 | 8 kg = 1.25978 st |
| 10 st | 63.5029 | 10 kg = 1.57473 st |
| 11 st | 69.8532 | 11 kg = 1.7322 st |
| 12 st | 76.2035 | 12 kg = 1.88968 st |
| 13 st | 82.5538 | 13 kg = 2.04715 st |
| 14 st | 88.9041 | 14 kg = 2.20462 st |
| 15 st | 95.2544 | 15 kg = 2.3621 st |
| 20 st | 127.006 | 20 kg = 3.14946 st |
Did You Know?
Weight conversions between st and kg are essential in international trade, where different countries use different measurement systems.
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Conversion factors on this page are either exact by definition, derived from exact definitions, or conventional values in documented use. Each is listed with its source in our conversion methodology and sources, which cites the BIPM SI Brochure, NIST Special Publication 811 and the relevant IEC or national standards. Results are rounded for display only; calculations use full precision.