Three ounces of liquor is exactly 2 standard shots in the United States, where one shot equals 1.5 fluid ounces. In bartending terms, 3 oz is also called a “double shot” and is roughly 90 ml.
The Math Behind 3 Oz
The standard U.S. shot glass holds 1.5 fluid ounces of liquid. Divide 3 by 1.5 and you get 2. So whether you’re measuring whiskey for a recipe, tracking how much you drank, or figuring out a cocktail pour, 3 oz equals two full shots.
In kitchen terms, 3 fluid ounces also equals 6 tablespoons or 18 teaspoons, since each tablespoon holds 0.5 oz and each teaspoon is a third of a tablespoon. That can be useful if you don’t have a shot glass or jigger handy.
Why the Answer Changes by Country
Shot sizes vary around the world, so 3 oz converts differently depending on where you are:
- United States: 1.5 oz per shot, so 3 oz = 2 shots
- United Kingdom: 25 ml (about 0.85 oz) in England and Wales, or 35 ml (about 1.2 oz) in Scotland and Northern Ireland. Three ounces works out to roughly 3.5 English shots or about 2.5 Scottish shots.
- Canada: Bars typically serve 1 oz pours, making 3 oz equal to 3 Canadian shots. The official “standard drink” is 1.5 imperial fluid ounces (about 43 ml), which is slightly smaller than the U.S. standard.
- Australia and Japan: 30 ml per shot (roughly 1 oz), so 3 oz is about 3 shots.
If you’re following a cocktail recipe from another country, check which shot standard it uses. The difference between a 1 oz and a 1.5 oz shot adds up fast in a multi-ingredient drink.
How Bartenders Measure 3 Oz
Professional bartenders use a jigger, a small hourglass-shaped measuring tool with a different capacity on each end. The most common jigger has a 1.5 oz side and a 0.75 oz side. To measure 3 oz, a bartender pours two full 1.5 oz sides. A 2 oz/1 oz jigger also works: one pour from each end gets you to 3 oz.
In bar terminology, a 3 oz pour is specifically called a “double shot,” while a single 1.5 oz pour is a “jigger shot” and a 1 oz pour is a “pony shot.” A “rocks shot,” typically served over ice, is 2 oz.
How Much Alcohol Is in 3 Oz of Liquor
The CDC and the National Institute on Alcohol Abuse and Alcoholism both define one “standard drink” as 1.5 oz of 80-proof (40% alcohol) distilled spirits. That means 3 oz of liquor counts as exactly 2 standard drinks. This applies to vodka, gin, rum, tequila, whiskey, brandy, and cognac at typical proof.
Higher-proof spirits change the math. A 3 oz pour of 100-proof bourbon contains 25% more alcohol than the same amount of standard 80-proof whiskey, even though the volume is identical. If you’re keeping track of your intake, proof matters as much as ounces.
Quick Reference for Common Pours
- 1 oz: A pony shot, or two-thirds of a standard U.S. shot
- 1.5 oz: One standard U.S. shot, one standard drink
- 2 oz: A rocks pour, common for whiskey served over ice
- 3 oz: A double shot, equal to 2 standard drinks