Guinness Draught has an ABV of 4.2%, in a standard 440 ml (14.9 US fl oz) widget can. That works out to about 18.5 ml (14.6 g) of pure alcohol per serving, roughly 1.04 US standard drinks or 1.85 UK alcohol units. Enter a different serving size or number of cans below to work out your own total.
Check the alcohol content of Guinness Draught
How much pure alcohol is actually in a Guinness Draught
ABV only tells you the percentage of the liquid that is alcohol, not the actual amount. A 440 ml (14.9 US fl oz) widget can of Guinness Draught at 4.2% ABV contains 18.5 ml of pure ethanol by volume, which weighs about 14.6 grams. That figure is what standard-drink and unit counts are built from, not the percentage on the label by itself.
Standard drinks and units, side by side
In the US, a standard drink is defined as 14 grams of pure alcohol, so a single 440 ml (14.9 US fl oz) widget can of Guinness Draught works out to about 1.04 US standard drinks. The UK measures differently, a unit is 10 ml of pure alcohol rather than a weight-based figure, so the same Guinness Draught comes out to roughly 1.85 UK units. Neither number is “more correct,” they are just two different national conventions for describing the same amount of alcohol.
How Guinness Draught compares to other drinks
Guinness Draught is the same 4.2 percent ABV as a light American lager, but in a larger 440 ml can, so a single Guinness can actually contains more total pure alcohol than a 355 ml Bud Light. Use the calculator above with any other drink’s ABV and serving size to see how it stacks up directly, rather than relying on the percentage alone.
Frequently asked questions
What is the ABV of Guinness Draught?
4.2%, per a standard 440 ml (14.9 US fl oz) widget can.
How many grams of alcohol are in a Guinness Draught?
About 14.6 grams of pure alcohol per 440 ml (14.9 US fl oz) widget can, which is 18.5 ml by volume.
Is this the same as how drunk I will get?
No. This calculator measures the alcohol content of the drink itself, not your blood alcohol level. For an estimate of how a given number of drinks might affect your BAC based on your weight and drinking pace, use the drunk calculator instead.
Why ABV alone can be misleading
Two drinks with the same ABV are not always equal if the serving sizes differ. A 5% ABV drink in a 500 ml can contains noticeably more pure alcohol than the same 5% ABV in a 355 ml can, simply because there is more liquid to carry it. This is part of why craft beers, wine, and spirits, which come in wildly different serving sizes, can be hard to compare using ABV percentage alone. Working from total pure alcohol content, as this calculator does, puts every drink on the same footing regardless of container size.
What this number does not tell you
Pure alcohol content is a fixed, objective figure, but how it affects any one person varies enormously by body weight, food intake, tolerance, and drinking pace. Two people who each drink one Guinness Draught will not necessarily feel the same effect, even though they consumed the identical amount of alcohol. For a rough sense of how a given number of drinks might translate into blood alcohol content for your own body weight, the drunk calculator walks through that separately using the Widmark formula.
Frequently asked follow-ups
Does the ABV on the label ever change?
It can vary slightly by batch and by market. Some brands brew the same beer to a marginally different ABV in different countries, so treat the label percentage as accurate for calculation purposes but not perfectly identical can to can everywhere.
How do calories relate to alcohol content?
Alcohol itself carries about 6.9 kcal per gram, so a 440 ml (14.9 US fl oz) widget can of Guinness Draught gets roughly 101 kcal from alcohol alone, before counting any carbohydrate calories from the rest of the beer. For a full breakdown including carbs, see the beer calories calculator.
Can I calculate this for a different can size?
Yes, use the calculator above and change the serving size and number of servings to match whatever you are actually drinking, a tallboy, a growler, or a full case.