How Many Oz Is a Shot Glass? | The 1.5 oz Standard

The standard U.S. shot glass holds 1.5 fluid ounces (44 mL), though the amount can range from 1 to 2 oz depending on the bar and glass design.

If you’re measuring a pour for a cocktail recipe or stocking a home bar, the number you’ll see most often is 1.5 oz. That’s the convention American bartenders and recipe writers default to, and it’s the capacity of the typical shot glass you’ll find in stores. But here’s the catch: the U.S. has no federal rule that defines a shot, so the size shifts depending on where you’re drinking and what glass you’re using.

Why There’s No Single Legal Shot Size

The U.S. government doesn’t mandate a standard shot pour, so the 1.5 oz figure is an industry convention rather than a legal requirement. Bars are free to pour more or less, and many do. In practice, you’ll encounter shot glasses and pours ranging from roughly 1.25 oz to 2 oz, with some venues pouring as little as 1 oz for premium spirits.

This matters for a simple reason: what you’re drinking and where you’re drinking it changes the math. A dive bar pouring well whiskey might give you a generous 2 oz. A craft cocktail spot charging for a rare bourbon might pour a conservative 1 oz. Neither is “wrong,” because no federal law settles the question.

Where the Law Actually Weighs In

There is one notable regional exception. Utah is frequently cited as the only U.S. state with a legal definition of a shot, set at 1.5 oz (44.4 mL). If you’re pouring drinks in Utah, that’s the number regulators expect. Everywhere else, the 1.5 oz standard is a matter of custom, not statute.

One common confusion is treating the glass itself as the measure. A shot glass can hold more than the standard pour — a 2 oz glass is common, and some novelty glasses hold 3 oz or more. The pour is what the bartender measures; the glass is just the vessel.

How Much Is a Double Shot?

A double shot is even less standardized than a single. In most U.S. bars, a double translates to roughly 2 to 3 oz, but you’ll rarely find a consistent rule. Some places pour two separate 1.5 oz shots, while others use a single 3 oz glass filled once.

The practical takeaway for home drinkers: whether a “double” means 2 oz or 3 oz depends entirely on the bar’s pour policy. When a recipe calls for a double, check what the house pours.

Shot Glass Sizes at a Glance

For practical use, assume 1.5 oz unless you know your bar pours differently. Recipes that call for “a shot” almost always mean the standard measure. The Wikipedia entry on shot glasses outlines the same convention and its regional exceptions.

If you’re buying glassware for home use and want a little more room for ice or mixers, a 2 oz glass handles the standard pour comfortably. You can browse our roundup of tested 2 oz shot glasses if you want a glass that covers both standard pours and doubles.