Stone and pounds to kg converter
Type the stone and the pounds, and the kilograms show as you type. Fill any two of stone, pounds, and kilograms to find the third.
- Kilograms (kg)
- 71.667594
11 st 4 lb = 71.667594 kg.
Kilograms (kg): 71.667594. 11 st 4 lb = 71.667594 kg.
Kilograms (kg) by stone (st)
How to calculate
Converts stone and pounds to kilograms: kg = (st × 14 + lb) × 0.45359237.
Example with the default inputs (Stone (st) 11, Pounds (lb) 4): 11 st 4 lb = 71.667594 kg.
Formula: kg = (st × 14 + lb) × 0.45359237
- 1 stone = 14 lb (NIST Handbook 44, Appendix C) and 1 lb = 0.45359237 kg exactly (NIST SP 811), so 1 stone = 6.35029318 kg. Pounds may be 14 or more.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up.
Worked examples
Each example is checked against the calculator on every build.
- Stone (st) 11, Pounds (lb) 4 gives Kilograms (kg) 71.667594.Source: NIST Handbook 44 (2026), Appendix C: 1 stone = 14 lb; NIST SP 811 (2008), Appendix B.8: 1 lb = 0.45359237 kg
- Stone (st) 1, Pounds (lb) 0 gives Kilograms (kg) 6.350293.Source: NIST Handbook 44 (2026), Appendix C: 1 stone = 14 lb; NIST SP 811 (2008), Appendix B.8: 1 lb = 0.45359237 kg
- Stone (st) 10, Pounds (lb) 7 gives Kilograms (kg) 66.678078.Source: NIST Handbook 44 (2026), Appendix C: 1 stone = 14 lb; NIST SP 811 (2008), Appendix B.8: 1 lb = 0.45359237 kg
Other questions people ask
How do I convert stone and pounds to kg?
Turn the weight into pounds, then multiply by 0.45359237: kg = (st × 14 + lb) × 0.45359237. A stone is 14 lb, and a pound is exactly 0.45359237 kg.
What is 11 stone 4 pounds in kg?
(11 × 14 + 4) × 0.45359237 = 158 × 0.45359237 = 71.667594 kg.
What is 10 st 7 lb in kg?
147 lb × 0.45359237 = 66.678078 kg.
How many pounds are in a stone?
14 (NIST Handbook 44). A pound is exactly 0.45359237 kg, so a stone is 14 × 0.45359237 = 6.35029318 kg.
Can I type pounds only?
Yes. Set the stone to 0. Pounds of 14 or more are fine: 0 st 158 lb is the same as 11 st 4 lb.