A typical mixed drink contains 1.5 to 2 ounces of liquor, which translates to one to one-and-a-third standard drinks. But many popular cocktails go well beyond that, packing two or even three standard drinks into a single glass. The actual amount depends on the recipe, the type of glass, and whether the drink includes additional alcoholic ingredients like liqueurs or fortified wines.
What Counts as One Standard Drink
In the United States, one standard drink contains 0.6 fluid ounces (14 grams) of pure alcohol. For distilled spirits like vodka, gin, rum, tequila, or whiskey at 40% alcohol by volume (80 proof), that works out to a 1.5-ounce pour. This is the baseline measurement used by the CDC and the National Institute on Alcohol Abuse and Alcoholism, and it’s the number you need to do the math on any cocktail.
The key formula is simple: multiply the total ounces of liquid by its alcohol percentage. A 1.5-ounce shot of 40% vodka gives you 0.6 ounces of pure alcohol, or exactly one standard drink. A 2-ounce pour of the same vodka bumps you to 0.8 ounces of pure alcohol, which is about 1.3 standard drinks before you add anything else to the glass.
Common Cocktails and Their Alcohol Content
Most classic cocktails follow a 2:1:1 ratio: 2 ounces of a base spirit, 1 ounce of citrus, and 1 ounce of a sweetener or liqueur. Drinks built this way, like margaritas, daiquiris, and whiskey sours, start at roughly 1.3 standard drinks from the base spirit alone. But the sweetener is often a liqueur that carries its own alcohol. Triple sec, a common margarita ingredient, ranges from 15% to 40% ABV depending on the brand. An ounce of a 38% triple sec adds another 0.38 ounces of pure alcohol, bringing a standard margarita closer to 1.6 standard drinks total.
Spirit-forward cocktails pack more. A martini combines 2 to 3 ounces of gin or vodka with vermouth, and finished versions often contain 4 ounces or more of alcoholic liquid. That puts a classic martini in the range of 2 to 2.5 standard drinks. An Old Fashioned typically uses 2 ounces of bourbon or rye, sometimes more, placing it around 1.3 to 1.7 standard drinks. Bars that pour generously or use higher-proof whiskey (45% ABV instead of 40%) push that number higher.
Highball-style drinks like a gin and tonic or rum and Coke tend to be lighter. They usually contain a single 1.5-ounce pour topped with several ounces of a non-alcoholic mixer, keeping them close to one standard drink. Tiki drinks and frozen cocktails are the wild cards: they can contain multiple spirits and liqueurs, sometimes totaling 3 ounces or more of base spirits in a single serving.
Why Bar Pours Vary So Much
There is no federal law in the U.S. requiring a specific pour size. The 1.5-ounce shot is a widely used standard, but individual bars set their own policies. Some establishments pour 1.25 ounces to control costs, while craft cocktail bars routinely use 2-ounce pours as their baseline. A “double” at most bars means 3 ounces of liquor, which equals two full standard drinks from the spirit alone.
Glassware also creates misleading impressions. A rocks glass holds 6 to 8 ounces, a coupe or V-shaped cocktail glass holds 5 to 7 ounces, and a highball glass holds 10 to 16 ounces. A large glass filled to the brim looks like a lot of liquid, but if most of it is ice and mixer, the alcohol content could be modest. Conversely, a small coupe glass holding a stirred, spirit-forward drink with no mixer can easily contain two standard drinks in just a few sips.
How Dilution Changes the Math
Shaking or stirring a cocktail with ice adds water through melting. In a typical cocktail, 25 to 35 percent of the final volume is water from melted ice. A 30-second stir adds about 25% water, while 90 seconds of stirring brings that closer to 32%. This dilution lowers the concentration of alcohol per sip, which is why a well-made cocktail doesn’t taste as strong as sipping straight liquor. But it doesn’t reduce the total amount of alcohol in the glass. A diluted martini and an undiluted martini contain the same grams of pure alcohol.
Drinks served over ice continue to dilute as you sip. A cocktail on the rocks that sits for 10 or 15 minutes will taste progressively weaker, but again, the total alcohol remains unchanged. The only thing that changes is how quickly your body absorbs it, since more dilute drinks are absorbed slightly more slowly.
How to Estimate Your Drink
If you want a quick estimate of any mixed drink, focus on two things: how many ounces of spirits went in, and whether the recipe includes additional alcoholic ingredients. Here’s a rough guide for popular drinks:
- Gin and tonic, vodka soda, rum and Coke: ~1 standard drink (1.5 oz spirit)
- Margarita, whiskey sour, daiquiri: ~1.5 standard drinks (2 oz spirit plus liqueur)
- Old Fashioned, Negroni: ~1.5 to 2 standard drinks (2+ oz spirit, possibly with additional alcoholic modifiers)
- Martini, Manhattan: ~2 to 2.5 standard drinks (2–3 oz spirit plus vermouth)
- Long Island Iced Tea, tiki drinks: ~2.5 to 3+ standard drinks (multiple spirits)
These are estimates for drinks made to standard recipes. Restaurant and bar versions can run larger, especially when served in oversized glasses or when the bartender pours heavy.
What This Means for Moderate Drinking
Current federal guidelines define moderate drinking as two drinks or fewer per day for men and one drink or fewer per day for women, with “drink” meaning one standard drink of 0.6 ounces of pure alcohol. A single cocktail that contains 1.5 to 2.5 standard drinks can put you at or above moderate levels with just one glass. Even low levels of alcohol use, less than one drink per day, raise the risk of certain cancers. Research shows that roughly two drinks per day does not lower the risk of death compared to not drinking at all.
If you’re keeping track, counting cocktails as “one drink” will undercount your actual intake. Counting the ounces of spirits that went into the glass gives you a far more accurate picture.