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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.
Answer   There are 768 teaspoons in one gallon There are 922.32954 teaspoons in an Imperial Gallon (UK measurements) There are 768 teaspoons in a US Gallon.