How to convert pounds to stone
To convert a measurement in pounds to stone, multiply the value by 0.071428571429. The conversion factor comes from the relationship between both units and the kilogram.
For example, to convert 5 lb to stone: 5 × 0.071428571429 = 0.357142857143 st.
What is a pound?
A pound is an imperial and US customary unit of mass equal to 16 ounces or exactly 0.45359237 kilograms. The pound derives from the Roman 'libra' (hence the symbol 'lb'). The international avoirdupois pound was fixed at exactly 0.45359237 kg by the 1959 international yard and pound agreement between English-speaking nations.
Common uses of pounds include: Body weight in the US and UK; Grocery and produce pricing in the US; Bodybuilding and weightlifting loads; Shipping weights for parcels in the US.
What is a stone?
A stone is a British imperial unit of mass equal to 14 pounds or exactly 6.35029318 kilograms. The stone was historically used across Europe with regionally varying values before Britain standardized it at 14 pounds. It remains in everyday use in the UK and Ireland for body weight despite metrication.
Common uses of stone include: Body weight in the UK and Ireland; Weigh-ins for sports and fitness in Britain; Historical and livestock weight references; Everyday conversational weight in the British Isles.
Pounds to stone worked examples
Here are some common values converted:
1 lb = 0.071428571429 st 5 lb = 0.357142857143 st 10 lb = 0.714285714286 st 50 lb = 3.571429 st 100 lb = 7.142857 st
Frequently asked questions
How many stone are in one pound?
One pound (lb) equals 0.071428571429 stone (st). Multiply any value in pounds by 0.071428571429 to convert to stone.
How do I convert pounds to stone?
Multiply the value in pounds by 0.071428571429. For example, 5 lb × 0.071428571429 = 0.357142857143 st.
How do I convert stone to pounds?
Multiply the value in stone by 14, or divide by 0.071428571429. Use the swap button on the converter above to reverse the direction.
Is the pound to stone conversion exact?
Yes. Since 1959 the international pound is defined as exactly 0.45359237 kg, so all weight conversions between metric and avoirdupois units use exact factors.
What is the formula for pounds to stone?
The formula is: st = lb × 0.071428571429. This comes from the definition of both units relative to the kilogram.