Unit converter
Kilograms to pounds and ounces.
Convert kg to lb + oz and lb + oz to kg. Type in either box and the other follows. Birth weights are the reason: UK hospitals record 3.5 kg and everyone then asks what that is in pounds and ounces (7 lb 11 oz).
| kg | lb + oz |
|---|---|
| 2 kg | 4 lb 6.55 oz |
| 2.5 kg | 5 lb 8.18 oz |
| 2.75 kg | 6 lb 1 oz |
| 3 kg | 6 lb 9.82 oz |
| 3.25 kg | 7 lb 2.64 oz |
| 3.5 kg | 7 lb 11.46 oz |
| 3.75 kg | 8 lb 4.28 oz |
| 4 kg | 8 lb 13.1 oz |
| 4.5 kg | 9 lb 14.73 oz |
| 5 kg | 11 lb 0.37 oz |
- The whole pounds are kept whole and only the remainder becomes ounces, which is why the answer reads the way people say it.
Definitions
- The kilogram is the SI base unit of mass, defined since 2019 by fixing the Planck constant rather than by a metal cylinder in Paris.
- Pounds and ounces together, as birth weights and butcher's scales are given. Sixteen ounces to the pound.
- This conversion is exact by definition. 80 kg = 176 lb 5.92 oz.
- Everything here is mass, not force. The pound is defined as exactly 0.453 592 37 kg, so pound-to-kilogram conversion is exact.
How it works
One direction multiplies and the other divides by the same number, so nothing is lost by going back and forth.
The value passes through kg, the unit every other mass & weight unit on the site is defined against, rather than a number written into this page on its own. That is why the figure here, the figure in the table above and the general mass & weight converter always agree.
Display precision limits significant figures rather than decimal places, because one fixed number of decimals is useless across a range this wide. Very large and very small results switch to scientific notation with a proper superscript exponent. The editable box always holds a plain number at full working precision, so you can carry on from either side.
Common questions this answers: what 3.5 kg is in pounds and ounces (7 lb 11.46 oz), how many ounces make a pound (16), and how to type it — "5 lb 9 oz" or just "5 9" are all accepted.
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