Kg to pounds and ounces
Hospitals weigh newborns in kilograms or grams, but many families share the news in pounds and ounces. Enter the weight in kg (3.45) to see it as pounds and ounces (7 lb 9.7 oz).
Kilograms to pounds and ounces converter
Rounded: 7 lb 11.5 oz · 3.5 kg · 7.7162 lb
Answers show 5 significant figures; the rounded line uses the step you pick here.
How it’s calculated
1 lb = 16 oz · 1 oz = 28.349523125 g exactly · 1 lb = 0.45359237 kg
ounces = kg ÷ 0.028349523125; pounds = ⌊ounces ÷ 16⌋; leftover ounces = ounces − pounds × 16
Step by step
- Divide by 0.028349523125 (kg per ounce): 3.5 ÷ 0.028349523125 = 123.46 oz.
- Divide by 16 to get whole pounds: 123.46 ÷ 16 = 7.7162, so 7 lb.
- The remainder is the ounces: 123.46 − 7 × 16 = 11.459 oz.
Baby weight conversion table
| Kilograms | Pounds and ounces | Rounded (0.1 oz) |
|---|---|---|
| 2 kg | 4 lb 6.5479 oz | 4 lb 6.5 oz |
| 2.25 kg | 4 lb 15.366 oz | 4 lb 15.4 oz |
| 2.5 kg | 5 lb 8.1849 oz | 5 lb 8.2 oz |
| 2.75 kg | 6 lb 1.0034 oz | 6 lb 1 oz |
| 3 kg | 6 lb 9.8219 oz | 6 lb 9.8 oz |
| 3.25 kg | 7 lb 2.6404 oz | 7 lb 2.6 oz |
| 3.5 kg | 7 lb 11.459 oz | 7 lb 11.5 oz |
| 3.75 kg | 8 lb 4.2774 oz | 8 lb 4.3 oz |
| 4 kg | 8 lb 13.096 oz | 8 lb 13.1 oz |
| 4.25 kg | 9 lb 5.9143 oz | 9 lb 5.9 oz |
| 4.5 kg | 9 lb 14.733 oz | 9 lb 14.7 oz |
| 4.75 kg | 10 lb 7.5513 oz | 10 lb 7.6 oz |
| 5 kg | 11 lb 0.36981 oz | 11 lb 0.4 oz |
| 5.25 kg | 11 lb 9.1883 oz | 11 lb 9.2 oz |
| 5.5 kg | 12 lb 2.0068 oz | 12 lb 2 oz |
| 5.75 kg | 12 lb 10.825 oz | 12 lb 10.8 oz |
| 6 kg | 13 lb 3.6438 oz | 13 lb 3.6 oz |
FAQ
The pound is exactly 0.45359237 kg and has 16 ounces, so the conversion is exact; the ounces are shown to one decimal place, as on most baby scales.
How do I convert a baby’s weight from kg to pounds and ounces?
Multiply the kilograms by 2.20462 to get pounds. The whole number is the pounds; multiply the decimal part by 16 to get the ounces. 3.5 kg = 7.7162 lb = 7 lb 11.5 oz.
How many ounces are in a pound?
There are exactly 16 avoirdupois ounces in a pound in both the US and the UK. A pound is exactly 0.45359237 kg and an ounce is 28.349523125 g.
What is an average birth weight?
Many full-term babies weigh between about 2.5 kg and 4 kg (roughly 5 lb 8 oz to 8 lb 13 oz). Your midwife, doctor or health visitor is the right person to interpret your own baby’s weight and growth chart.
Why do hospitals use kilograms?
Hospitals in most countries, and many in the US, weigh babies in grams or kilograms because medicine doses are calculated per kilogram. Families often still share the weight in pounds and ounces.
Is Unitglide accurate enough for medical use?
Unitglide uses the exact legal definition of the pound and ounce, so the arithmetic is exact. For feeding or medication decisions always follow the figures your clinician gives you.
Sources
- NIST Handbook 44, Appendix C (General Tables of Units of Measurement): 1 in = 2.54 cm exactly; 1 lb = 0.45359237 kg exactly; 1 lb = 16 oz.
Checked by Unitglide on 2026-10-27.