CalcPairsStone Converter — Stone to lbs and Stone to kg
10 stone is 140 pounds — and 63.502932 kg. A stone is exactly 14 pounds by definition, and exactly 6.35029318 kg. Use the switch above the second box to read the answer in pounds or kilograms.
Type in either box — the other side answers instantly. Everything is worked out in your browser; your numbers are never uploaded anywhere.
How this conversion works
The stone is Britain's body-weight unit: people are 9 stone, 12 stone, 15 stone, and the rest of the world is left to decode it. This page serves both decodings at once — stone to pounds for American readers, stone to kilograms for everyone else — with a switch on the second box and both columns side by side in the table below.
Half-stones are common in real life: 10½ stone is 147 lbs or 66.68 kg. The converter takes decimals, so 10.5 stone works exactly as written.
The exact formula
pounds = stone × 14 · kilograms = stone × 6.35029318
1 stone = 14 lb exactly, and 14 × 0.45359237 kg = 6.35029318 kg. The reverse: stone = pounds ÷ 14, or kilograms ÷ 6.35029318.
Stone to Pounds conversion table
| Stone (st) | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| 1 | 14 | 6.350293 |
| 2 | 28 | 12.700586 |
| 3 | 42 | 19.05088 |
| 4 | 56 | 25.401173 |
| 5 | 70 | 31.751466 |
| 6 | 84 | 38.101759 |
| 7 | 98 | 44.452052 |
| 8 | 112 | 50.802345 |
| 9 | 126 | 57.152639 |
| 10 | 140 | 63.502932 |
| Stone (st) | Pounds (lbs) | Kilograms (kg) |
|---|---|---|
| 11 | 154 | 69.853225 |
| 12 | 168 | 76.203518 |
| 13 | 182 | 82.553811 |
| 14 | 196 | 88.904105 |
| 15 | 210 | 95.254398 |
| 16 | 224 | 101.604691 |
| 17 | 238 | 107.954984 |
| 18 | 252 | 114.305277 |
| 19 | 266 | 120.65557 |
| 20 | 280 | 127.005864 |
Frequently asked questions
How many pounds are in a stone?
Exactly 14 pounds — that is the definition of the stone.
How many kilograms are in a stone?
6.35029318 kg exactly. So to turn stone into kilos, multiply by about 6.35.
Why do Americans not use stone?
The US kept pounds only; the stone survived in Britain and Ireland for body weight, even though official UK measurements are metric. A 'stone' of other goods once varied by town and trade — the 14 lb body-weight stone is the one that lasted.