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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.
1 Teaspoon [US] = 4.92892159 Milliliters. Teaspoon is a volume unit mostly used in cooking recipes and prescriptions. 1 US tsp is about 5 milliliters and 1/6 of fluid ounces. The abbreviations are tsp, ts.