How many milliliters are in 1 teaspoon?

• A. 60 ml
• B. 15 ml
• C. 45 ml
• D. 5 ml

Answer: (D)

Converting common kitchen measures to milliliters is the key idea. A teaspoon is defined as 5 milliliters, so 1 teaspoon equals 5 mL. This small, precise amount is often used in recipes and medical dosing, and you can check consistency by noting that 1 tablespoon is 15 mL (three teaspoons), and 1 cup is about 240 mL. The numbers in the other options reflect larger measures (for example, 15 mL is a tablespoon, 45 mL is three tablespoons, and 60 mL is four tablespoons), not one teaspoon. So 5 mL is the correct amount for 1 teaspoon.