About the lb to st calculation
One pound is exactly 0.071429 stone, so converting between them is a single multiplication. Enter any value above and the result updates as you type. The everyday US weight unit. Defined as exactly 0.45359237 kg since 1959. A British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Formula
st = lb × 0.071429
1 lb = 0.071429 st
1 st = 14 lbWorked example
To convert 150 lb, multiply by 0.071429: 150 × 0.071429 = 10.7143 st.
Frequently asked questions
How many stone are in a pound?
There are 0.071429 stone in one pound. To convert any amount, multiply the number of pounds by 0.071429.
How do I convert stone back to pounds?
Divide instead of multiplying, or equivalently multiply by 14. One stone is 14 pounds.
Is this conversion exact?
Yes. Since the international agreement of 1959, the relationship between pounds and stone is defined exactly rather than measured, so the only rounding here is in how many decimal places we show.
Where is each of these units used?
Pounds: the everyday US weight unit. Defined as exactly 0.45359237 kg since 1959. Stone: a British unit of exactly 14 pounds, still the normal way to state bodyweight in the UK.
Sources
- NIST Special Publication 811 — Guide for the Use of the International System of Units