Unit converter
Pounds and ounces to kilograms.
Convert lb + oz to kg and kg to lb + oz. Type in either box and the other follows. Type it as "7 lb 11 oz" or "7 11". Red books, passports and airline allowances all want the kilograms.
| lb + oz | kg |
|---|---|
| 4 lb 0 oz | 1.81437 kg |
| 5 lb 0 oz | 2.26796 kg |
| 6 lb 0 oz | 2.72155 kg |
| 6 lb 8 oz | 2.94835 kg |
| 7 lb 0 oz | 3.17515 kg |
| 7 lb 8 oz | 3.40194 kg |
| 8 lb 0 oz | 3.62874 kg |
| 8 lb 8 oz | 3.85554 kg |
| 9 lb 0 oz | 4.08233 kg |
| 10 lb 0 oz | 4.53592 kg |
- The whole pounds are kept whole and only the remainder becomes ounces, which is why the answer reads the way people say it.
Definitions
- Pounds and ounces together, as birth weights and butcher's scales are given. Sixteen ounces to the pound.
- 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.
- This conversion is exact by definition. 1 lb 0 oz = 0.453592 kg.
- 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 7 lb 11.46 oz is in kilograms (3.5 kg), 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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