Unit converter
Pounds to Stone Converter
Convert pounds to stone using the exact factor 1 / 14.
1 pound = 0.071429 stone
Common pounds to stone values
| Pounds | Stone |
|---|---|
| 1 lb | 0.071429 st |
| 2 lb | 0.142857 st |
| 5 lb | 0.357143 st |
| 10 lb | 0.714286 st |
| 20 lb | 1.4286 st |
| 50 lb | 3.5714 st |
| 100 lb | 7.1429 st |
One stone is exactly 14 lb, based on the same 453.59237 g pound used by the mass table, so pounds become stone by division rather than by an approximate metric shortcut. This is useful for translating US body-weight entries, fitness app exports, sports weigh-ins, gym notes, airline luggage comments, or old household records into the UK stone style. It also helps when a weight is given in total pounds but someone expects stone and pounds.
How to convert
- Start with the total weight in pounds.
- Multiply by the exact factor 1 / 14, which is the same as dividing the pound value by 14.
- The decimal result is the weight in stone.
- To write stone and leftover pounds, take the whole-number stone and multiply it by 14, then subtract that from the original pounds.
- For a mental estimate, use 140 lb = 10 st and add or subtract one stone for each 14 lb.
stone = pounds * (1 / 14)
A stone contains exactly 14 pounds. Dividing a pound value by 14 therefore gives the decimal stone value. The same relationship can be split into whole stone plus leftover pounds for UK body-weight notation.
- lb
- the total weight in pounds you start with
- 14
- pounds in one stone
Worked example
A fitness app weight of 168 lb is 168 multiplied by 1 / 14, which equals 12 st. There are no leftover pounds because 12 multiplied by 14 returns exactly 168 lb.
Key facts
- One pound is 1 / 14 st.
- Fourteen pounds is exactly 1 st.
- One hundred and forty pounds is exactly 10 st.
- Stone notation is mainly used for body weight, not food packaging or postal labels.
Tips
- For UK body-weight style, keep the remainder as pounds rather than a long decimal stone value.
- For decimal charts, one decimal place in stone equals 1.4 lb, so two decimals are often clearer.
- If a luggage or parcel note is in pounds, keep total pounds for the carrier and use stone only for personal comparison.
Frequently asked questions
How many stone is 1 pound?+
One pound is exactly 1 / 14 stone, about 0.07142857142857142 st.
How many pounds are in 1 stone?+
One stone is exactly 14 pounds.
How do I express 155 lb as stone and pounds?+
Divide 155 by 14 to get 11 whole stone with 1 lb left over, so 155 lb is 11 st 1 lb.
Is this the same pound used in the US?+
Yes. The everyday US pound and the imperial avoirdupois pound have the same 453.59237 g definition for this purpose.
Things to watch
- Rounding to whole stone is very coarse; round to stone and pounds if the difference matters.
- US and imperial pounds match for this conversion, but stone is a UK-style unit and may not be accepted by US forms.
Sources
- NIST Handbook 44, Appendix C: General Tables of Units of Measurement · NIST
- International yard and pound agreement (1959) · NIST
- Weights and Measures Act 1985 · UK legislation.gov.uk
Last updated: 2026-01-01
Conversions use internationally defined factors. Provided for general use; verify critical measurements independently.