Conversion factors
1 lb = 0.45359237 kg 1 oz = 1/16 lb ≈ 28.3495 g 1 st = 14 lb ≈ 6.35029 kg 1 US short ton = 2,000 lb = 907.18474 kg 1 metric tonne = 1,000 kg
The pound is defined as exactly 0.45359237 kg, so every customary unit here converts to metric exactly. Results are rounded to about six significant figures for display.
Kilograms and pounds
To turn kilograms into pounds, divide by 0.45359237 (or multiply by about 2.20462). To turn pounds into kilograms, multiply by 0.45359237. For a quick estimate, double the kilograms and add 10%: 70 kg → 140 + 14 = 154 lb, against an exact 154.324 lb.
| Kilograms | Pounds | Pounds | Kilograms |
|---|---|---|---|
| 1 kg | 2.20462 lb | 1 lb | 0.453592 kg |
| 5 kg | 11.0231 lb | 5 lb | 2.26796 kg |
| 10 kg | 22.0462 lb | 10 lb | 4.53592 kg |
| 25 kg | 55.1156 lb | 50 lb | 22.6796 kg |
| 50 kg | 110.231 lb | 100 lb | 45.3592 kg |
| 60 kg | 132.277 lb | 150 lb | 68.0389 kg |
| 70 kg | 154.324 lb | 180 lb | 81.6466 kg |
| 80 kg | 176.37 lb | 200 lb | 90.7185 kg |
| 100 kg | 220.462 lb | 250 lb | 113.398 kg |
Body weight in stone
In the UK and Ireland, body weight is often given in stone and pounds. Here's how to convert 72 kg:
- Convert to pounds: 72 ÷ 0.45359237 = 158.73 lb.
- Divide by 14 for whole stone: 158.73 ÷ 14 = 11, which uses 154 lb.
- The rest is pounds: 158.73 − 154 = 4.73 lb.
- So 72 kg is about 11 st 4.7 lb.
The converter shows stone as a decimal (11.3381 st for 72 kg). The decimal part is a fraction of a stone, not pounds, so 11.34 st is not 11 st 3.4 lb.
| Stone | Pounds | Kilograms |
|---|---|---|
| 8 st | 112 lb | 50.8023 kg |
| 9 st | 126 lb | 57.1526 kg |
| 10 st | 140 lb | 63.5029 kg |
| 11 st | 154 lb | 69.8532 kg |
| 12 st | 168 lb | 76.2035 kg |
| 13 st | 182 lb | 82.5538 kg |
| 14 st | 196 lb | 88.9041 kg |
| 15 st | 210 lb | 95.2544 kg |
Ounces and grams for cooking
| Ounces | Grams |
|---|---|
| 1 oz | 28.3495 g |
| 2 oz | 56.699 g |
| 4 oz | 113.398 g |
| 8 oz | 226.796 g |
| 12 oz | 340.194 g |
| 16 oz (1 lb) | 453.592 g |
Going the other way, 100 g is 3.5274 oz, 250 g is 8.81849 oz and 500 g is 17.637 oz. Fluid ounces measure volume, not weight, so they can't be converted here.
Tons and tonnes
A US short ton is 2,000 lb (about 907 kg). A metric tonne is 1,000 kg (about 2,204.62 lb). The British long ton of 2,240 lb is a third unit and isn't included.