Stone to Pounds

The stone is the UK and Ireland's home-grown way of talking about body weight, and it is defined as exactly 14 pounds (lb). The relationship is fixed by long-standing statute, with the 14-pound stone in everyday use for centuries, so stone-to-pound maths never involves rounding: what you calculate is what it is.

To convert stone to pounds, multiply by 14. So 10 stone × 14 = 140 pounds. Going the other way, divide pounds by 14: 140 ÷ 14 = 10 stone. When there is a remainder, that is the leftover pounds: 150 ÷ 14 = 10 stone with 10 pounds remaining, written 10 st 10 lb.

After working with these conversions for years, I can tell you the common trip-ups. The first is forgetting the half: 10.5 stone is 147 lb, not 140, because that half stone is a full 7 lb. The second is mixing stone up with the American habit of quoting pounds alone. If someone tells you their weight as "160 pounds" in a British gym, that is 11 stone 6, not 11 stone.

If you also need the kilogram equivalent, multiply stone by 6.35029 or use our stone to kg converter. One pound is 0.453592 kg, so you can also go via pounds: stone × 14 × 0.453592 gives the same answer both ways, which is a handy cross-check.

When to Use Stone vs Pounds

In everyday UK life, people give body weight in stone and pounds together: "11 stone 6" rather than "160 pounds" or "72.6 kg". Pounds alone show up in the US, in gyms for dumbbell weights, and for smaller measurements like food or luggage, where stone would be an unnecessarily large unit. Doctors and nurses in the UK usually record kilograms, which is exactly the mismatch this whole site exists to untangle.

One more practical note. If your GP says you weigh 80 kg and you want it back in familiar units, that is about 12 stone 8 pounds. Run it through our kg to stone converter for the exact figure rather than guessing.

Quick Mental Math

For a rough stone-to-pounds conversion in your head: multiply the stone by 10, then add four times the stone value on top. For 11 stone: 11 × 10 = 110, plus 11 × 4 = 44, giving 154 pounds. (Because 14 = 10 + 4.) A bit of practice and it becomes second nature.