How this calculator works
A stone is exactly 14 pounds, so converting pounds to stones is a division by 14. It is one of the few exact unit conversions with no decimal in the factor. Because 14 does not divide most pound values evenly, the result usually carries a fraction: 155 lb is 11.0714 st. To read that as stones and pounds, take the whole stones and multiply the remainder by 14. In the United Kingdom, bathroom scales often show this split directly.
Formula
st = lb / 14. lb = st x 14. With the international pound, one stone is 6.35029318 kg and one pound is 0.45359237 kg.
Worked example
154 lb = 11 st exactly. 140 lb = 10 st. 160 lb = 11.4286 st, or 11 st 6 lb. 200 lb = 14.2857 st. 100 lb = 7.14286 st.
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Frequently asked questions
How many pounds are in a stone?
Exactly 14 pounds. The stone is defined that way in the British imperial system, so no rounding is involved.
How do I turn 11.4286 st into stones and pounds?
Keep the 11 whole stones and multiply 0.4286 by 14, which gives about 6 pounds. The weight is 11 st 6 lb, close to the exact 11 st 6 lb for 160 lb.
Why does the UK still use stones?
The stone remains customary for body weight, especially in conversation and in some medical settings. Official measurements in the United Kingdom can use either metric or imperial units.
Is a stone used outside the UK?
It is used in the United Kingdom, Ireland and some Commonwealth countries for body weight and, historically, for agricultural goods. Most of the world uses kilograms.