You need the liquid, because a pint is volume and a pound is weight
There is no fixed pint-to-pound number. The result depends entirely on what is in the pint. Water is the reference at about 1.04 lb per US pint, which is where the old saying “a pint’s a pound the world around” comes from. It holds for water and nothing else.
A US pint is not a UK pint
The imperial (UK) pint is 20% larger than the US pint, so it also weighs about 20% more for the same liquid. This is the biggest trap in the conversion.
Same word, different size: a UK pint holds 20 fluid ounces, a US pint holds 16. Weigh water and the UK pint comes out about 0.21 lb heavier.
Weight of one US pint, by liquid
| Liquid | Density (g/mL) | 1 US pint |
|---|---|---|
| Water | 1.00 | 1.04 lb |
| Whole milk | 1.03 | 1.07 lb |
| Corn syrup | 1.38 | 1.44 lb |
| Honey | 1.42 | 1.50 lb |
| Olive oil | 0.92 | 0.96 lb |
| Ethanol (alcohol) | 0.79 | 0.82 lb |
For an imperial pint, multiply these US figures by about 1.20. To go the other way, divide the weight by the density: 3 lb of honey is 3 ÷ 1.50 = 2 US pints.
Common questions
Is a pint really a pound?
Only for water, and only roughly. A US pint of water weighs about 1.04 lb, so "a pint's a pound" is close enough as a memory aid. A UK (imperial) pint is 20% bigger, so it weighs about 1.25 lb, and anything denser or lighter than water breaks the rule.
How many pounds is a pint of honey?
About 1.5 lb for a US pint. Honey is roughly 1.4 times as dense as water, so the same volume weighs about 44% more. A pint of olive oil, being lighter than water, is only about 0.96 lb.
Why do I need the liquid to convert a pint to pounds?
A pint is a volume and a pound is a weight, so you can only cross between them if you know how heavy the liquid is per unit volume, which is its density. Pick water and you get one answer; pick mercury and the same pint weighs 14 times as much.
