A standard shot glass in the United States typically holds 1.5 fluid ounces (44 milliliters) of liquor, which is the most commonly accepted size by bartenders and the only officially defined shot size in Utah

. However, shot glass sizes can vary widely depending on the bar, restaurant, or country. Some shot glasses may hold as little as 1 ounce or less, while others, especially in countries like Japan and Israel, can hold around 2 ounces or more

. In summary:

• Standard U.S. shot glass size: 1.5 ounces (44 mL)
• Common range: 1 to 2 ounces
• Double shot: usually about 3 ounces or more
• Variations exist internationally and by establishment

If precise measurement is needed, using a jigger (often 1.5 oz on one side) or measuring spoons (3 tablespoons = 1.5 oz) is recommended