How it works
Stone is one of those units that confuses everyone outside Britain and Ireland. The good news: the conversion couldn’t be simpler. 1 stone = 14 pounds, exactly. No decimals, no fudge factor.
So to get pounds, multiply the stone by 14. Enter a value, read the result, and use the dropdown if you’d rather see kilograms (a stone is about 6.35029 kg) or work the other direction.
Why stone sticks around
Most of the world dropped stone for body weight ages ago, but the UK and Ireland never did. Ask a Brit their weight and you’ll hear “eleven stone seven,” not 161 pounds and definitely not 73 kilograms. Bathroom scales sold there often default to stone-and-pounds, and so do gym intake forms and GP records in casual conversation.
That’s exactly where this gets awkward. A US fitness app wants pounds. A European clinic wants kilograms. The British number is in stone. Two conversions and you’re sorted.
The whole-and-part trick
Stone weights almost always come as a whole number of stone plus some pounds, like “9 st 3 lb.” To convert that to total pounds:
multiply the stone by 14, then add the leftover pounds
So 9 st 3 lb is (9 x 14) + 3 = 129 pounds. Forget the “+3” and you’d report 126, which is wrong by three pounds. The converter handles a decimal stone value directly, but when you’re reading a stone-and-pounds figure off a scale, remember to fold in both parts.
Quick conversion table
| Stone | Pounds | Kilograms |
|---|---|---|
| 1 st | 14 lb | 6.35 kg |
| 5 st | 70 lb | 31.75 kg |
| 8 st | 112 lb | 50.80 kg |
| 10 st | 140 lb | 63.50 kg |
| 11 st | 154 lb | 69.85 kg |
| 12 st | 168 lb | 76.20 kg |
| 14 st | 196 lb | 88.90 kg |
| 16 st | 224 lb | 101.60 kg |
The 11 st line is worth a glance: 154 lb is a weight a lot of fitness charts treat as a reference point, and it’s roughly 70 kg, a tidy round metric figure. That three-way alignment is pure coincidence, but it’s a handy anchor.
Things to keep in mind
Stone is for people, basically. You’ll rarely see it used for luggage, food, or freight, so if you’re weighing a suitcase, you want kilograms or pounds, not stone.
The exactness cuts both ways. Because 1 stone is precisely 14 lb, the stone-to-pounds step never loses accuracy. The kilogram figure carries a tiny bit of rounding (since a pound is 0.453592 kg), but it’s still good to a fraction of a gram for any real purpose.
Don’t confuse the British stone with anything you might read in an old American or imperial document. For body weight today it’s universally 14 lb, and that’s what this uses.
The whole thing runs in your browser. No value you type is uploaded, and it works offline once the page has loaded.
FAQ
How many pounds in a stone?
Exactly 14. So 10 stone is 140 lb and 12 stone is 168 lb.
How do I convert something like 9 stone 4 pounds?
Multiply the stone by 14, then add the pounds: (9 x 14) + 4 = 130 lb.
How much is a stone in kilograms?
About 6.35029 kg. So 11 stone works out to roughly 69.85 kg.
Why do British people still use stone?
Habit and culture, mostly. The UK and Ireland kept stone for body weight even after going metric for almost everything else.
Does this upload my weight?
No. It’s a quick client-side calc, so your numbers stay on your device and nothing gets sent.