In the United States, one standard drink contains 0.6 fluid ounces (14 grams) of pure alcohol. That’s the amount found in a 12-ounce regular beer, a 5-ounce glass of wine, or a 1.5-ounce shot of distilled spirits. These three servings look very different in the glass, but they deliver the same amount of alcohol to your body.
What Counts as One Standard Drink
The key number is 14 grams of pure alcohol. How much liquid that translates to depends entirely on how strong the beverage is. A regular beer at about 5% alcohol by volume (ABV) needs 12 ounces to reach that threshold. Table wine, typically around 12% ABV, gets there in just 5 ounces, which is less than you might expect if you’ve ever watched a generous restaurant pour. And 80-proof spirits (40% ABV) hit the mark in 1.5 ounces, a single standard shot.
These reference points assume typical alcohol percentages, and that’s where things get tricky in practice. Many popular craft beers run 7% to 9% ABV or higher, meaning a single 12-ounce can could contain nearly two standard drinks. The same applies to wine: a bold red at 15% ABV poured into a large wine glass can easily surpass one standard drink before you’ve filled the glass halfway. If you’re tracking your intake, checking the ABV on the label matters more than counting glasses.
How Your Body Processes One Drink
Your liver breaks down alcohol at a remarkably steady pace: roughly one standard drink per hour. Unlike food digestion, which you can speed up with exercise or other activity, time is the only thing that clears alcohol from your system. Drinking coffee, taking a cold shower, or eating a meal after drinking won’t accelerate the process. If you have four drinks in two hours, your body still has about three hours of work left after your last sip.
Several factors influence how quickly alcohol affects you, even if the metabolism rate stays constant. Women generally feel the effects of the same amount of alcohol more strongly than men, partly because of differences in body composition: higher body fat and lower body water mean the alcohol is more concentrated in the bloodstream. Drinking on an empty stomach lets alcohol pass rapidly into the small intestine, where it’s absorbed fast. Food in your stomach closes the valve at the bottom of the stomach during digestion, slowing that absorption considerably.
A few less obvious factors also play a role. Carbonated drinks, including sparkling wine and mixed drinks with soda, increase the rate of alcohol absorption because the pressure from carbonation pushes alcohol into the bloodstream faster. Altitude amplifies alcohol’s effects too. Drinks consumed at high elevations can feel nearly twice as potent for the first few days until your body adjusts. Fatigue, stress, and medications can all intensify the impact of even a single standard drink.
Standard Drinks Vary by Country
The 14-gram U.S. definition isn’t universal. Canada defines a standard drink as containing about 13.6 grams of pure alcohol (17.05 mL of ethanol). The United Kingdom uses an “alcohol unit” of just 8 grams, so a pint of average-strength beer counts as roughly two units. Australia sets its standard drink at 10 grams. These differences mean that drinking guidelines from different countries aren’t directly comparable unless you convert them to the same unit first.
How Many Drinks Are Considered Safe
The Dietary Guidelines for Americans (2020-2025) recommend that men limit intake to 2 drinks or less per day on days when alcohol is consumed, and women to 1 drink or less per day. These are daily ceilings, not targets or averages. Having seven drinks on Saturday is not the same as one drink each day of the week, even though the weekly total matches.
The World Health Organization takes a harder line. In a 2023 statement, the WHO concluded that no level of alcohol consumption is safe for health. Alcohol is classified as a Group 1 carcinogen, the same category as tobacco and asbestos, and causes at least seven types of cancer, including bowel cancer and breast cancer. Perhaps the most striking finding: half of all alcohol-related cancers in Europe are caused by what most people would consider light or moderate drinking, defined as less than about 1.5 liters of wine or 3.5 liters of beer per week. Current evidence shows no threshold below which alcohol’s cancer-causing effects simply switch off, and the WHO noted that any potential cardiovascular benefits of light drinking do not outweigh the cancer risk at those same levels.
Binge Drinking by the Numbers
The CDC defines binge drinking as 4 or more standard drinks for women, or 5 or more for men, during a single occasion. By this measure, splitting a bottle of wine with a friend over dinner (about 2.5 standard drinks each) falls just under the threshold for women. Finishing the bottle alone crosses it. Because many people underestimate how much alcohol is in their glass, especially with wine and craft beer, it’s easy to cross into binge drinking territory without realizing it.
Practical Ways to Track Your Intake
The simplest approach is to check the ABV percentage on the label and adjust your mental math accordingly. A 16-ounce pint of 6% beer is about 1.5 standard drinks, not one. A generous 8-ounce pour of 14% wine is more than two standard drinks. At a bar, mixed cocktails are especially hard to gauge because they often contain multiple types of spirits in a single glass.
If you pour wine or spirits at home, try measuring once with a kitchen measuring cup so you know what 5 ounces or 1.5 ounces actually looks like in your usual glassware. Most people are surprised at how small a true standard serving appears. That visual calibration makes it far easier to keep an accurate count going forward.