Pounds to Stones & Pounds

These pounds to stones and pounds (lb to st & lb) conversions give a simple way to convert your weight in the US (pounds only) format to the way it is given in the UK (stones and pounds). Just type a weight into either the pounds box or into the stones and pounds boxes to convert between American and British weights.

lb = st lb

Why Do The British Use Stone For Weight When Americans Don't?

This anomaly in the way people measure their weight on either side of the Atlantic came about in 1824 when the stone was formally adopted into the British Imperial Avoirdupois weight system. The Weights And Measures Act of 1824, passed by the British parliament, set the stone as 14 pounds. This act also changed the quarter, hundredweight and ton to be a whole number of stones.

As US independence came in 1776, before this act of parliament, the American system of weights wasn't changed to incorporate the stone. Thus Americans generally give their weight in pounds and the British, and many people in other former British colonies, give their weight in stones and pounds.

Your Ideal Weight - Body Mass Index

Your body mass index (BMI) gives a way to identify whether you are too light, about right or too heavy. It is calculated as your body mass (weight) divided by your height squared with the calculation being done in kilograms and metres (so you need to convert if you use pounds and stones). There is a good body mass index calculator here together with an explanation of what the numbers mean.

Quick Lookup Pounds to Stones & Pounds Common Conversions

The following table gives results for commonly sought pounds to stones and pounds conversions.

Pounds 5075100125150175200225250275300325350375400
Stones &
3st 8lb5st 5lb7st 2lb8st 13lb10st 10lb12st 7lb14st 4lb16st 1lb17st 12lb19st 9lb21st 6lb23st 3lb25st 0lb26st 11lb28st 8lb

Full Conversion Tables

Conversion Formulae

The conversion formulae for stones (st) to pounds (lb) conversions and vice versa are as follows:

  • 1 stone = 14 pounds
  • 1 pound = 0.07142857 stones