A standard shot in the United States is typically 1.5 ounces (about 44 milliliters). However, this can vary slightly depending on the country or establishment:

• U.S. standard shot: 1.5 oz (44 ml)
• U.K. standard shot: 25 ml or 35 ml (about 0.85 or 1.2 oz)
• Australia: usually 30 ml (about 1 oz)

If you're measuring for a recipe or a drink, 1.5 ounces is the most common measurement for a shot in the U.S.