The exact factor, and a shortcut you can do in your head
The pound is defined as exactly 0.45359237 kg, so one kilogram is 2.20462 pounds. For a fast estimate, double the kilograms and add 10%: 70 kg → 140 + 14 = 154 lb, within half a pound of the exact 154.3. Multiplying by 2 alone leaves you 10% short.
Quick reference — body weight
| Kilograms | Pounds | Stone & pounds |
|---|---|---|
| 50 kg | 110.2 lb | 7 st 12 lb |
| 60 kg | 132.3 lb | 9 st 6 lb |
| 70 kg | 154.3 lb | 11 st 0 lb |
| 80 kg | 176.4 lb | 12 st 8 lb |
| 90 kg | 198.4 lb | 14 st 2 lb |
| 100 kg | 220.5 lb | 15 st 11 lb |
Gym plates convert the same way: a 20 kg Olympic plate is 44.1 lb, and the 20 kg bar is another 44.1 lb — worth knowing before you match a metric gym's load in pounds.
Pounds, ounces and stone
- Ounces — the fractional pounds become ounces at 16 to the pound, so 70.3 lb reads as 70 lb 5 oz.
- Stone — a UK body-weight unit equal to 14 pounds, or about 6.35 kg. "11 stone" is 154 lb, which is 70 kg.
- Mass, not weight — kilograms measure mass and stay the same anywhere; pounds are used for the everyday "weight" you feel, which is why the two only line up here on Earth.
Common questions
How many pounds are in a kilogram?
One kilogram is 2.20462 pounds. The value comes from the 1959 agreement that fixed the pound at exactly 0.45359237 kilograms.
How do I convert kg to lb in my head?
Multiply by 2 and add 10% of the result. For 80 kg: 80 x 2 = 160, plus 16 is 176 lb (the exact answer is 176.4). The error stays under half a percent.
What is 70 kg in pounds?
70 kg is 154.3 lb, or 11 stone exactly — a common way to state adult body weight.
