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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.
Google can do all kinds of unit conversions for you. In a Google search field, I just asked teaspoons in one tablespoon and got this: teaspoons in one tablespoon. There are 3 US teaspoons in one US tablespoon. (So, there are 1.5 teaspoons in half a US tablespoon. I have graduated measuring spoons that include half and quarter teaspoon measures.)