A standard drink in the United States contains 0.6 fluid ounces (14 grams) of pure alcohol. That’s the amount found in 12 ounces of regular beer, 5 ounces of wine, or 1.5 ounces of distilled spirits. The concept exists because different beverages have wildly different alcohol concentrations, and you need a common unit to track how much alcohol you’re actually consuming.
How Much Alcohol Is in Each Type of Drink
The three most common examples of a standard drink all deliver the same 14 grams of pure alcohol, just in different volumes:
- Beer: 12 fluid ounces at about 5% alcohol by volume (ABV). This is a typical can or bottle of domestic beer.
- Wine: 5 fluid ounces at about 12% ABV. That’s less than you might think, roughly two-thirds of a standard wine glass filled to a normal pour line.
- Spirits: 1.5 fluid ounces of 80-proof liquor (40% ABV). This is a single shot of vodka, whiskey, rum, gin, or tequila.
These numbers only hold at those specific ABV percentages. This is where most people undercount their intake.
Why Your Drinks Probably Contain More Than You Think
A craft IPA at 7% to 9% ABV packs significantly more alcohol than a 5% lager. A 12-ounce pour of a 9% double IPA contains nearly two standard drinks, not one. The same logic applies to wine: many California reds now clock in at 14% to 15% ABV, meaning a 5-ounce glass contains more than one standard drink, and the generous pour you get at a restaurant or at home could easily equal 1.5 to 2 standard drinks.
Cocktails are even harder to gauge. A margarita or Long Island iced tea can contain two, three, or even four standard drinks depending on how it’s mixed. The only reliable way to estimate is to think about how many shots of liquor went into the glass.
How Your Body Processes One Drink
Your liver breaks down alcohol at a remarkably steady rate: roughly one standard drink per hour. That clock doesn’t speed up with coffee, food, water, or a cold shower. Time is the only thing that clears alcohol from your system.
Several factors change how quickly you feel the effects, though. Food in your stomach slows absorption because it triggers a valve at the bottom of the stomach to close during digestion, keeping alcohol from reaching your small intestine as fast. Carbonated drinks (champagne, mixed drinks with soda) do the opposite, increasing the rate of absorption because the pressure forces alcohol into the bloodstream more quickly. Drinking at high altitude can make drinks feel nearly twice as potent for the first few days until your body adjusts.
Body composition matters too. Muscle tissue absorbs alcohol; fat does not. People with higher body fat percentages tend to reach higher blood alcohol levels from the same number of drinks. Women generally experience stronger and longer-lasting effects from the same amount of alcohol as men, partly due to differences in body water content and hormonal factors. Fatigue, stress, and medications can all amplify the effects as well.
What Counts as Excessive Drinking
The CDC defines binge drinking as four or more drinks for women, or five or more drinks for men, on a single occasion. By “occasion,” they mean a single sitting or a period of a few hours. Given how easy it is to undercount drinks (especially with high-ABV craft beers or heavy pours of wine), many people cross this threshold without realizing it.
The most recent U.S. Dietary Guidelines stepped back from the previous recommendation of no more than two drinks per day for men and one for women. The updated guidance simply states that people should “consume less alcohol for better overall health,” without specifying a number. The World Health Organization goes further, stating plainly that no level of alcohol consumption is safe for health. Their position, published in The Lancet Public Health, is that cancer risk begins with the first drink and increases with every additional one. The less you drink, the lower the risk.
Standard Drinks Vary by Country
If you’re reading health guidelines from another country, be aware that “one standard drink” doesn’t mean the same thing everywhere. The U.S. and Canada both define it as 14 grams of pure alcohol. Australia uses 10 grams, the UK uses 8 grams, and Japan uses 20 grams. A recommendation to limit yourself to “two standard drinks” in Australia is quite different from the same advice in Japan. Always check which country’s definition is being used.
Calories in a Standard Drink
Pure alcohol contains 7 calories per gram, nearly as calorie-dense as fat (which has 9 calories per gram). A single standard drink delivers about 98 calories from the alcohol alone, before accounting for carbohydrates in beer, residual sugar in wine, or the syrups and juices in cocktails. A pint of craft beer can easily reach 200 to 300 calories. A frozen margarita can top 400. If you’re tracking calories, alcohol is one of the easiest sources to overlook because nutrition labels on alcoholic beverages are not required to list calorie counts in the same way food labels do.
How to Estimate Your Actual Intake
The simplest approach is to think in terms of pure alcohol rather than “drinks.” Every 0.6 fluid ounces (or 14 grams) of pure alcohol equals one standard drink. For any beverage, you can estimate the number of standard drinks by multiplying the volume in ounces by the ABV percentage, then dividing by 0.6. A 16-ounce pint of 6% beer, for example, comes out to 1.6 standard drinks. A 6-ounce glass of 14% wine is 1.4 standard drinks.
Many people find it easier to simply measure their pours at home once or twice to calibrate their eye. Five ounces of wine looks small in a large glass. Once you see what a true single serving looks like, it becomes much easier to estimate in real time.