Explainer
How many ounces in a pint glass: 16 for a US pint, 20 imperial for a UK pint, and why foam and the ounce itself change the real pour.
A glass sold as a pint can hold 16 ounces, 20 ounces, or about 14 ounces of actual beer once the foam is counted, and which one you get depends on the country and on how the glass is poured. The answer matters most when a label says 20 ounces and the glass will be filled with a stout that needs room for its head.
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The US pint glass is built around 16 US fluid ounces, about 473 milliliters. The British imperial pint is 20 fluid ounces, about 568 milliliters, and Ireland and Canada use the same imperial measure.
In practice that means a bar in the United States that pours craft beer in a standard pint is serving a smaller glass than a pub in the British Isles, even though both call it a pint.
The two systems also define the ounce differently. The imperial fluid ounce is a little smaller than the US one, so a 20-imperial-ounce pint works out to about 19.2 US ounces.
The gap between the two pints is therefore narrower than the labels suggest, and a glass sold in the US with a 20-ounce label is worth a second look at which ounce the maker means.
The typical conical pint glass holds its stated 16 US ounces only when it is filled to the rim with liquid. Pour a beer with about half an inch of foam and the liquid drops to roughly 14 US ounces, which is one eighth less than the name promises.
UK trade guidelines accept the same trade-off: a pint there only has to be at least 95 percent liquid, leaving up to 5 percent for the head. Glass size, then, tells you the ceiling, and the pour decides what you actually drink.
Outside the US and UK the word stretches further. Shape shifts capacity as well, and pint glass sizes range from small pilsners to tall steins, so the table below sticks to the pint measure itself.
| Pint | Where | Volume |
|---|---|---|
| US liquid pint | United States | 16 US fl oz, about 473 ml |
| US dry pint | United States, rare | 18.6 US fl oz, about 551 ml |
| Imperial pint | UK, Ireland, Canada | 20 imp fl oz, about 568 ml |
| Australian pint | Australia | 570 ml |
| South Australian pint | South Australia | 425 ml |
Ireland pours Guinness by the imperial pint, which is 20 fluid ounces, so a glass that holds 20 ounces to the brim leaves space for the full pour and the creamy head on top. The Guinness-branded sets and the Lord's Rocks sets among the listed products are all labeled 20 ounces.
Because a label usually states capacity to the rim, treat it as the upper limit and check the maker's description when exact volume matters. For models with a 20-ounce capacity, see the glass comparison for guinness.
In Ireland and the UK it is served in the imperial pint, 20 fluid ounces or about 568 milliliters, and the branded Guinness glasses listed in this category are sized at 20 ounces to match.
No. A US pint glass holds 16 ounces and a UK pint glass 20, and decorative or branded versions can differ slightly in volume with their shape, so check the stated capacity when precision matters.