To convert pounds to stone, divide by 14. The whole number is the stone and the remainder is pounds: 180 lb is 12.857 st, or 12 st 12 lb.
British and Irish readers usually want the stone-and-pounds form, so this converter shows both.
How to use the lbs to stone converter
- Type the value in pounds into the box. Decimals are fine.
- The result in stone updates as you type, along with the working.
- Need the other way? Switch the direction menu, or open the stone to lbs converter.
Formula
One stone is exactly 14 avoirdupois pounds (6.35029318 kg), as set out in the UK Weights and Measures Act 1985.
Worked example
Convert 180 lb to stone and pounds.
- 180 ÷ 14 = 12.857 st.
- Whole stone: 12. Leftover: 180 − 12 × 14 = 12 lb.
- Result: 12 st 12 lb.
Pounds to stone chart
Common values, rounded to 3 decimal places.
| Pounds (lb) | Stone (st) | st + lb |
|---|---|---|
| 98 lb | 7 st | 7 st 0 lb |
| 112 lb | 8 st | 8 st 0 lb |
| 120 lb | 8.571 st | 8 st 8 lb |
| 126 lb | 9 st | 9 st 0 lb |
| 130 lb | 9.286 st | 9 st 4 lb |
| 140 lb | 10 st | 10 st 0 lb |
| 150 lb | 10.714 st | 10 st 10 lb |
| 154 lb | 11 st | 11 st 0 lb |
| 160 lb | 11.429 st | 11 st 6 lb |
| 168 lb | 12 st | 12 st 0 lb |
| 170 lb | 12.143 st | 12 st 2 lb |
| 180 lb | 12.857 st | 12 st 12 lb |
| 182 lb | 13 st | 13 st 0 lb |
| 190 lb | 13.571 st | 13 st 8 lb |
| 196 lb | 14 st | 14 st 0 lb |
| 200 lb | 14.286 st | 14 st 4 lb |
| 210 lb | 15 st | 15 st 0 lb |
| 224 lb | 16 st | 16 st 0 lb |
| 250 lb | 17.857 st | 17 st 12 lb |
| 280 lb | 20 st | 20 st 0 lb |
Reading a weight in stone
Weights in stone are written "12 st 12 lb" or just "12st 12." Landmarks: 10 st = 140 lb, 12 st = 168 lb, 14 st = 196 lb, 16 st = 224 lb. The chart lists common body weights with both forms.
If you're tracking weight loss, a stone is 14 lb, about 6.35 kg. To work out BMI, enter your weight in the bmi calculator.
Quick mental math
Count in 14s: 140 is 10 stone, 168 is 12, 196 is 14. Then add what's left. 175 lb: 168 + 7 = 12 st 7 lb.
Related conversions
Going the other way: stone to lbs converter. Related pages: lbs to kg converter, kg to lbs converter, ounces to grams converter. For other units in the same family, use the full weight converter.
Caveats and assumptions
- Results show up to 10 significant digits; the chart is rounded for reading. Keep full precision for engineering, medical or legal work.
Frequently asked questions
How many stone is 200 lbs?
14.286 st, which is 14 st 4 lb.
How many stone is 150 lbs?
10.714 st, or 10 st 10 lb.
What is 1 lb in stone?
1/14 stone, about 0.0714 st.
How do I convert kg to stone?
Divide kg by 6.35029318, or convert to pounds on the kg to lbs converter page and divide by 14.
Sources
- UK Weights and Measures Act 1985, Schedule 1 — defines the stone (14 lb), imperial gallon and imperial fluid ounce
- NIST SP 811 Appendix B.9 — Conversion factors — pound to kilogram
This calculator gives estimates for planning and education. Check measurements, local codes, supplier specs and your school's official policy before relying on a result. See our disclaimer and how we build and check calculators.