In the United States, one standard drink contains about 14 grams (0.6 fluid ounces) of pure alcohol. That’s the key number, and it stays the same whether you’re drinking beer, wine, or whiskey. What changes is the size of the glass.
Standard Drink Sizes by Beverage Type
Because different drinks have different alcohol concentrations, a “standard drink” looks very different depending on what you’re pouring. Here are the most common equivalents, each containing that same 14 grams of pure alcohol:
- Regular beer (5% ABV): 12 fluid ounces, or one typical can or bottle
- Malt liquor or hard seltzer (7% ABV): 8 to 10 fluid ounces
- Table wine (12% ABV): 5 fluid ounces
- Fortified wine like sherry or port (17% ABV): 3 to 4 fluid ounces
- Liqueurs and cordials (24% ABV): 2 to 3 fluid ounces
- Distilled spirits like vodka, gin, rum, tequila, or whiskey (40% ABV): 1.5 fluid ounces, a single shot
- Brandy or cognac (40% ABV): 1.5 fluid ounces, one jigger
The 5-ounce wine pour surprises a lot of people. If you’ve ever filled a large wine glass halfway, you likely poured closer to 8 or 9 ounces, which is nearly two standard drinks. The same goes for a generous home pour of whiskey. Without measuring, most people undercount.
Why Mixed Drinks Are Hard to Count
A standard shot is 1.5 ounces, but bartenders and home pourers don’t always stick to that. A strong margarita or Long Island iced tea can easily contain two or three shots of liquor, meaning one cocktail equals two or three standard drinks. Even a single martini, typically made with about 2.5 ounces of gin or vodka, lands closer to 1.5 standard drinks.
Craft beers add another layer of confusion. A “regular” beer is defined at 5% ABV, but many IPAs and stouts run 7% to 10% or higher. A 16-ounce pint of a 9% imperial IPA contains roughly the same alcohol as two and a half standard drinks. If you want to track your intake accurately, the alcohol percentage on the label matters just as much as the glass size.
How to Calculate Standard Drinks in Any Container
You can figure out the number of standard drinks in any beverage with a simple formula: multiply the volume in ounces by the alcohol percentage (as a decimal), then divide by 0.6. For example, a 16-ounce can of 6.5% beer: 16 × 0.065 = 1.04 ounces of pure alcohol, divided by 0.6 = about 1.7 standard drinks.
This is especially useful for tallboy cans, wine bottles, and cocktail pitchers. A standard 750-milliliter wine bottle (about 25.4 ounces) at 12% ABV works out to roughly five standard drinks. That means splitting a bottle between two people gives each person about two and a half drinks, not two.
How Your Body Processes One Drink
Your liver breaks down alcohol at a remarkably steady pace: roughly one standard drink per hour. It cannot speed up this process no matter how much water you drink or food you eat after the fact. When you consume alcohol faster than one drink per hour, the excess keeps circulating in your bloodstream, and your blood alcohol concentration (BAC) climbs.
This is why spacing matters more than total volume alone. Three drinks over five hours produces a very different BAC than three drinks in one hour. Time is the only thing that actually removes alcohol from your system.
Recommended Limits Based on Standard Drinks
The Dietary Guidelines for Americans (2020-2025) recommend that men limit alcohol to 2 drinks or fewer per day on days when they drink, and women limit to 1 drink or fewer per day. These are daily caps, not averages. Saving up a week’s worth and drinking them on Saturday doesn’t carry the same risk profile as spreading them out.
Binge drinking is defined as a pattern that pushes your BAC to 0.08% or higher. For most adults, that translates to five or more drinks for men, or four or more drinks for women, consumed within about two hours. By these numbers, even a relatively casual evening of cocktails can cross the binge threshold if the drinks are strong or closely spaced.
Common Scenarios That Trip People Up
Knowing the standard drink definition is only useful if you can apply it to real life. Here are a few situations where people consistently undercount:
- Restaurant wine pours: Many restaurants serve 6- to 8-ounce glasses, which is 1.2 to 1.6 standard drinks per glass.
- Home beer glasses: A typical pint glass holds 16 ounces, not 12. That alone adds a third of a drink over the standard.
- Brunch cocktails: A mimosa made with equal parts champagne and juice in a large flute can vary wildly, but a heavy champagne pour easily hits one full standard drink.
- High-ABV craft beer: A 12-ounce can of 8% double IPA contains about 1.6 standard drinks, and many people drink two or three in a sitting.
The gap between “number of drinks I had” and “number of standard drinks I consumed” can be significant. Paying attention to both the pour size and the alcohol percentage gives you a much more accurate picture of your actual intake.