Drop sizes change depending on the weight of the liquid. This range can be anywhere between 50 - 120 drops per teaspoon. Since there are 3 teaspoons per tablespoon, then (50 to 120) x 3 = 150 to 360 drops per tablespoon. There are also several exact definitions of a drop. Here are 3 of them: <ul><li> the metric drop, 1/20 ml (50 μL).