Baby Weight Converter

The average birth weight for a full-term newborn is about 3.3 kg (7 lb 5 oz). The typical healthy range is 2.5–4.5 kg (5 lb 8 oz – 9 lb 15 oz). Boys average slightly heavier than girls by about 100–150 g.

Multiply kilograms by 2.20462 to get total pounds. Take the decimal portion and multiply by 16 to get ounces. For example, 3.5 kg × 2.20462 = 7.716 lb. The 0.716 lb × 16 = 11.5 oz, so 3.5 kg = 7 lb 11.5 oz.

Simply divide grams by 1,000 to get kilograms. For example, 3,500 g ÷ 1,000 = 3.5 kg. Then use this converter to get the pounds and ounces equivalent.

Weight on its own doesn't tell the full story — it's most meaningful when tracked as a percentile for your baby's age and sex using WHO or CDC growth charts. Use our Baby Weight-for-Age Percentile Calculator for a more complete picture.

The World Health Organization defines low birth weight as less than 2.5 kg (5 lb 8 oz). Babies born at less than 1.5 kg (3 lb 5 oz) are considered very low birth weight and usually require additional medical support.