When comparing standard servings of beer, wine, and spirits, they all contain roughly the same amount of pure alcohol: about 0.6 fluid ounces, or 14 grams. A 12-ounce can of regular beer (5% ABV), a 5-ounce glass of wine (12% ABV), and a 1.5-ounce shot of distilled spirits (40% ABV) each deliver one standard drink’s worth of ethanol. So if you’re looking at a typical exam or quiz question listing these three options, the answer is that they’re equal.
But that’s only true when each beverage is poured at its textbook serving size. In the real world, the amount of pure alcohol in your glass varies enormously depending on what you’re drinking and how much of it you pour.
Why Standard Drinks Are Designed to Be Equal
The U.S. standard drink is built around a single target: 14 grams of pure alcohol. Health agencies sized each serving so that target stays constant across beverage types. Beer gets the largest glass (12 ounces) because it’s the most dilute. Wine gets a medium pour (5 ounces) at roughly 12% alcohol. Spirits get the smallest measure (1.5 ounces) because they’re the most concentrated at around 40% alcohol. The math works out to the same payload every time.
You can verify this with a simple formula. Multiply the volume of the drink in milliliters by its ABV (as a decimal), then multiply by 0.79, the density of ethanol in grams per milliliter. For a 12-ounce (355 mL) beer at 5% ABV: 355 × 0.05 × 0.79 = about 14 grams. For a 1.5-ounce (44 mL) shot at 40% ABV: 44 × 0.40 × 0.79 = about 14 grams. Same result.
When Drinks Are Not Equal
The “they’re all the same” answer assumes you’re comparing textbook pours. In practice, many beverages blow past those assumptions. A craft double IPA runs 7.5% to 10% ABV, and an imperial stout can reach 8% to 12% or higher. A single 12-ounce can of a 10% craft beer contains two standard drinks, not one. The NIAAA flags this specifically: that 12-ounce bottle silently doubles your alcohol intake compared to a regular beer.
Wine is similarly variable. A bold red might be 14% or 15% ABV rather than the assumed 12%, and restaurant pours often exceed 5 ounces. A generous 8-ounce glass of 15% wine delivers nearly twice the pure alcohol of a standard drink.
Fortified wines like port and sherry typically land between 17% and 22% ABV, which is why their traditional serving size is smaller, around 3 to 4 ounces. Pour a full wine glass of port and you’re looking at significantly more alcohol than a standard drink of table wine.
Spirits With the Highest Alcohol Concentration
If the question is simply which beverage contains the most pure alcohol by volume, distilled spirits win by a wide margin, and some go far beyond the standard 40% ABV. Regular vodka, gin, rum, tequila, and whiskey hover around 40% (80 proof), but plenty of bottles sit higher. Overproof rum can reach 75% ABV. Cask-strength whiskeys often land between 50% and 65%.
At the extreme end, grain alcohols like Everclear and Golden Grain are sold at 95% ABV (190 proof). A Polish rectified spirit called Spirytus Rektyfikowany edges even higher at 96% ABV (192 proof), making it the strongest commercially available spirit in the world. A single 1.5-ounce shot of Everclear contains about 42 grams of pure alcohol, three times the amount in a standard drink.
How to Estimate Your Actual Intake
Knowing the standard drink definition is useful, but it only helps if you adjust for what you’re actually drinking. Three things matter: the volume in your glass, the ABV on the label, and how many times you refill.
- Check the label. ABV is printed on every bottle. A 7% IPA in a 16-ounce pint glass contains about 1.8 standard drinks. A 5% light lager in the same glass contains about 1.3.
- Watch pour sizes. Most people pour wine well beyond 5 ounces at home. A kitchen measuring cup can recalibrate your eye.
- Do the quick math. Multiply ounces by ABV percentage and divide by 0.6. The result is your approximate number of standard drinks. For example, 16 ounces × 0.07 ÷ 0.6 = 1.87 standard drinks.
Country Definitions Vary
The 14-gram standard is specific to the United States. Other countries set the bar differently. The United Kingdom defines a unit as 8 grams of pure alcohol, roughly 57% of the American standard drink. Australia uses 10 grams. Canada uses 13.45 grams. This means health guidelines about “number of drinks per week” don’t translate directly across borders. If you’re reading international recommendations, check which gram standard they’re using before comparing numbers.