One standard drink in the United States contains 0.6 fluid ounces (14 grams) of pure alcohol. That’s the fixed amount, regardless of what you’re drinking. The container size changes depending on the beverage, because different drinks have different alcohol concentrations, but the alcohol inside stays the same.
Standard Drink Sizes by Beverage
Since every standard drink delivers the same 14 grams of pure alcohol, the glass or bottle just gets smaller as the drink gets stronger:
- Regular beer (5% ABV): 12 fluid ounces, a typical can or bottle
- Malt liquor (7% ABV): roughly 8 to 9 fluid ounces
- Table wine (12% ABV): 5 fluid ounces
- Fortified wine like sherry or port (17% ABV): 3 to 4 fluid ounces
- Distilled spirits like vodka, whiskey, or gin (40% ABV): 1.5 fluid ounces, a standard shot
These numbers assume the ABV listed above. A craft IPA at 9% ABV packs nearly twice the alcohol of a regular beer, so a 12-ounce can of it is closer to two drinks, not one.
How to Calculate Drinks in Any Container
If you want to figure out exactly how many standard drinks are in a bottle, can, or glass, use this simple formula: multiply the volume in ounces by the ABV (as a decimal), then divide by 0.6. For example, a 25-ounce bottle of wine at 14% ABV works out to (25 × 0.14) / 0.6, which equals about 5.8 standard drinks.
This is especially useful for tall cans of beer (often 16 or even 24 ounces), oversized cocktails, and high-ABV craft beers where the serving looks like one drink but contains two or three.
Why Your Actual Pour Is Probably More
A standard wine pour is 5 ounces, which gives you five glasses from a 750-milliliter bottle. But many restaurants pour 6 ounces, and at home, most people pour even more freely. That means a single glass of wine at dinner could easily count as 1.2 to 1.5 standard drinks without you realizing it.
The same applies to cocktails. A generous bartender pouring 2 ounces of spirits instead of 1.5 turns a “one drink” cocktail into 1.3 drinks. Mixed drinks with multiple types of liquor can contain three or four standard drinks in a single glass. If you’re trying to keep track, counting by containers or glasses almost always underestimates your intake.
How Long One Drink Takes to Leave Your System
Your liver processes alcohol at a relatively fixed rate. The half-life of alcohol is four to five hours, meaning it takes that long for your body to clear half of what you drank. Full elimination of even a single drink takes considerably longer than most people assume.
Several factors speed up or slow down that process. Women generally metabolize alcohol more slowly than men. Smaller body size means less water in your blood to dilute the alcohol, leading to a higher blood alcohol concentration from the same amount. Age slows processing, and liver or kidney conditions can slow it further. Certain medications also interact with alcohol in ways that change how quickly your body handles it.
Current Guidelines on Daily Limits
The U.S. Dietary Guidelines recommend no more than 2 drinks per day for men and 1 drink per day for women. That limit applies to any single day, not as an average over a week. You can’t “save up” five days of not drinking and have seven drinks on Saturday.
It’s worth noting that these guidelines represent a moderation threshold, not a safety guarantee. The World Health Organization published a statement clarifying that no amount of alcohol consumption is truly safe for your health. Alcohol is classified as a Group 1 carcinogen, the same category as tobacco and asbestos, and current evidence shows no threshold below which cancer risk disappears entirely. The risk starts with the first drink and increases with every additional one. The U.S. guidelines themselves acknowledge that drinking less is better for health than drinking more.