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Now that we know how many fluid ounces and milliliters there are in a teaspoon and a tablespoon, we can count easily how many teaspoons in a tablespoon: 1  1 US tablespoon has 3 teaspoons. 2  1 Australian tablespoon has 4 teaspoons.
One teaspoon is about equal to 5 milliliters. Technically a teaspoon is equal to about 4.93 milliliters, so 5 milliliters equals 1.01 teaspoons. However, for the nutritional labeling on food packaging in the United States, it is defined as exactly 5 milliliters.