How to Convert Pounds to Stone (lb to st)
Weight units matter at the wet market, where older stalls and Chinese medical halls still quote prices per kati or tael, and when following American recipes in ounces and pounds. This guide shows how to convert pounds into stone by hand, with examples and a quick-reference table.
The conversion
To convert pounds to stone, multiply the value by 0.0714285714. To go the other way, divide by the same number (or multiply by 14). For a quick estimate, multiply by about 0.071.
Stone = pounds × 0.0714285714
Worked examples
- 3 lb = 0.214286 st
- 12.5 lb = 0.892857 st
- 75 lb = 5.3571 st
Pounds to Stone table
| 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 |
| 25 lb | 1.7857 st |
| 50 lb | 3.5714 st |
| 100 lb | 7.1429 st |
| 250 lb | 17.8571 st |
| 500 lb | 35.7143 st |
| 1,000 lb | 71.4286 st |
Common questions
Is lb to st exact?
The factors used here are the internationally defined values where they exist; results are rounded for display only.
How do I convert back?
Use the Stone to Pounds converter.
Mistakes to avoid
Mixing similar-sounding units
US and imperial gallons, pints and tons are different sizes, and decimal kilobytes differ from binary kibibytes.
Dropping the units
A bare number without a unit is easy to misread later. Always write the unit with the result.
Rounding the factor too early
Using 3 instead of 3.28 for feet per metre introduces an error of almost 9% before you have started.
Background
Many conversion factors are exact by definition. The inch has been defined as exactly 2.54 centimetres since 1959, and the pound as exactly 0.45359237 kilograms, so conversions involving them can be as precise as you need.
For everyday use, three or four significant figures are usually enough. Engineering, science and trade documents may need more, and rounding should happen only at the end of a calculation.
Unit conversion is simply multiplication by a fixed ratio. The ratio between two units of the same quantity never changes, so once you know it you can convert any value in either direction.
For any value, use the Pounds to Stone Converter or browse all weight converters.
Run your own numbers: Pounds to Stone Converter