A standard serving of alcohol in the United States contains 0.6 fluid ounces (14 grams) of pure alcohol. What that looks like in your glass depends entirely on what you’re drinking: 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of 80-proof spirits each count as one standard drink.
Standard Serving Sizes by Drink Type
The reason serving sizes differ so much is that each type of alcohol has a different concentration. Beer at 5% alcohol by volume needs a much larger pour to deliver the same amount of pure alcohol as whiskey at 40%. Here’s what one standard drink looks like:
- Beer (5% ABV): 12 fluid ounces, which is one regular can or bottle.
- Wine (12% ABV): 5 fluid ounces, roughly half of a typical wine glass filled to the brim.
- Distilled spirits (40% ABV / 80 proof): 1.5 fluid ounces, or one standard shot glass.
These numbers assume the alcohol percentages listed above. A craft IPA at 7% or 9% ABV packs significantly more alcohol into the same 12-ounce can, meaning one can could equal 1.5 to 2 standard drinks. The same applies to wine: a rich Zinfandel at 15% ABV delivers more alcohol per 5-ounce glass than a light Pinot Grigio at 11%.
How Many Drinks Are in a Bottle?
A standard 750ml bottle of wine holds about 25.4 fluid ounces. At 5 ounces per serving, that’s roughly five glasses of wine per bottle. Many people assume they’re getting four generous pours, but those pours are closer to 6 or 7 ounces each, putting each glass at 1.2 to 1.4 standard drinks.
For spirits, a standard 750ml bottle of 80-proof liquor contains about 17 standard drinks (1.5 ounces each). A 1.75-liter handle holds roughly 40 standard drinks. If you’re making cocktails at home, it’s easy to lose track. A generous free-pour often lands closer to 2 or 3 ounces, which is nearly double a standard serving.
A Simple Way to Eyeball Your Pour
If you have a standard 16-ounce red plastic cup (the kind common at parties), the molded lines on the inside can serve as rough guides. The bottom line marks about 1 ounce, close to a standard liquor serving. The second line up marks about 5 ounces, which is one serving of wine. The third line marks about 12 ounces, one serving of beer. This isn’t precise, but it’s a useful visual when you don’t have a measuring tool.
At home, a kitchen jigger (the double-sided measuring tool bartenders use) is the most reliable way to pour spirits accurately. For wine, pouring into a measuring cup once will show you exactly how far up your favorite wine glass 5 ounces reaches. Most people are surprised by how modest it looks.
Calories Per Serving
The calorie count across drink types varies more than you might expect:
- Regular beer (12 oz): about 153 calories
- Light beer (12 oz): about 103 calories
- Craft beer (12 oz): 170 to 350 calories, depending on style and ABV
- Red wine (5 oz): about 125 calories
- White wine (5 oz): about 128 calories
- 80-proof spirits, neat (1.5 oz): about 97 calories
Spirits look like the low-calorie option, but that changes fast once you add mixers. A rum and cola or a margarita can easily reach 250 to 400 calories per cocktail. The 97-calorie figure applies only to straight liquor with no additions.
How Your Body Processes One Drink
Your liver breaks down alcohol at a fairly constant rate: roughly one standard drink per hour. That rate doesn’t change with coffee, food, cold showers, or exercise. If you have three drinks in an hour, it takes your body approximately three hours to fully process the alcohol, regardless of how you feel.
This is why the pace of drinking matters as much as the total amount. Two drinks spread over four hours produces a very different blood alcohol level than two drinks in 30 minutes, even though the total consumption is identical.
Recommended Limits
The Dietary Guidelines for Americans (2020-2025) define moderate drinking as up to 2 standard drinks per day for men and up to 1 per day for women. These aren’t averages, meaning you can’t “save up” a week’s worth for Saturday night. The daily limit reflects the amount your body can handle within a given timeframe without substantially increasing health risks.
The difference between the men’s and women’s guidelines comes down to body composition and metabolism. Women generally have less body water to dilute alcohol and produce less of the enzyme that breaks it down in the stomach, so the same number of drinks produces a higher blood alcohol concentration.
US vs. International Standards
If you’re reading health information from other countries, be aware that “one drink” doesn’t mean the same thing everywhere. In the UK, the standard measurement is one “unit,” which contains 8 grams of pure alcohol. That’s just over half of a US standard drink (14 grams). So when UK guidelines recommend no more than 14 units per week, that translates to roughly 8 US standard drinks per week. Comparing guidelines across countries without adjusting for this difference can be misleading.