Pounds to Stone Converter

The converter above is already set to pounds and stone, so you only need to enter your number. The result updates as you type, and nothing is sent anywhere.

1. Type your value in the Value box, for example 168. Decimals and negative numbers are accepted.
2. Check that From shows pounds and To shows stone. Both menus can be changed if you need a different pair.
3. Read the answer in the large result box. The note under it shows the exact factor used for one pound.
4. Press Copy result to put the answer on your clipboard, or Swap units to convert in the opposite direction.
5. Look at In every unit on the right to see the same amount in all the other weight units.

One pound is about 0.0714286 stone, so the formula is stone = pounds x 0.0714286. Going the other way, one stone is exactly 14 pounds. The pound is defined as exactly 0.45359237 kilograms, and the abbreviation lb comes from the Latin word libra. A stone is 14 pounds, about 6.35 kilograms, and is still used for body weight in the UK and Ireland.

Worked examples with the same factor:

• 168 pounds: 168 x 0.0714286 = 12 stone
• 420 pounds: 420 x 0.0714286 = 30 stone
• 1,680 pounds: 1,680 x 0.0714286 = 120 stone

Divide by 14, then turn the decimal part back into pounds by multiplying it by 14.

To check the converter by hand, take 420 pounds and apply the rule once: the result should be 30 stone. If you go back again with the reverse factor 14 you land on 420 pounds, which confirms that the two directions agree. Rounding the factor to fewer digits for mental math gives a result that is close but not identical, so use the tool when the last digits matter.

These reference values come from the same factor the converter uses, so they match what you see above. Use the table for common amounts, and the converter for anything else.

Pounds, ounces and stone belong to the avoirdupois system, while grams and kilograms belong to the metric system. Since 1959 the pound has been defined as exactly 0.45359237 kilograms in the United States and the Commonwealth, so conversions are exact rather than approximate. Shops, gyms, airlines and doctors each pick one system, which is why people switch between them so often.

Use the table as a sanity check rather than a substitute for the converter. The result must scale with the input: double the weight and the converted figure doubles. For anything that matters, such as a medicine dose or a shipping charge, read the unit printed on the scale or label first, because the same number means very different things in each system.

Converting pounds to stone helps when comparing US figures with UK weight charts, and a result such as 11.4 stone really means 11 stone 6 pounds.

Do not mix up the UK stone, the US ton and the metric tonne when reading older sources, and remember that body weight in stone is usually written as stone and pounds, such as 11 stone 6, not as a decimal.

Related pages: Stone to Pounds Converter for the reverse direction, and the grams to kilograms and ounces to grams pages. For other weight units use the weight converter.

The page keeps no history, so each visit starts again from the defaults, 168 pounds. Your numbers are processed by JavaScript in your own browser and are never sent to a server, which makes the converter safe for private figures such as medical, financial or work measurements.