Pounds and Ounces Calculator
Convert between pounds & ounces and decimal pounds, kilograms or grams.
Pounds & ounces7 lb 8 oz
Decimal pounds7.5 lb
Total ounces120 oz
Kilograms3.4019 kg
Grams3,401.9 g
Working
| Whole pounds | 7 lb |
| Remainder in ounces | 8 oz |
| 1 lb | 16 oz = 453.59237 g |
| 1 oz | 28.349523125 g |
The conversions
There are 16 ounces in a pound, and a pound is defined as exactly 453.59237 grams:
decimal pounds = lb + oz ÷ 16
grams = decimal pounds × 453.59237
So 7 lb 8 oz is 7 + 8/16 = 7.5 lb, which is
7.5 × 453.59237 = 3402 g — about 3.4 kg.
Birth weights
This is the conversion most people come here for. Hospitals in the US and UK often quote birth weight in pounds and ounces while records and growth charts use kilograms, so the same baby gets described both ways. A typical newborn is around 7 lb 8 oz, or 3.4 kg.
Ounces here are avoirdupois (weight) ounces, not fluid ounces — those measure volume and are a different thing entirely.