In both the U.S. and imperial systems of measurement, 3/4 teaspoon is equal to 1/4 tablespoon. In the U.S. measurement system, 3/4 teaspoon is equivalent to 3.7 milliliters, and in the imperial system, 3/4 teaspoon is equal to 4.44 milliliters.
Likewise, 3/4 U.S. teaspoon is 0.23 cubic inch, while 3/4 imperial teaspoon is 0.27 cubic inch.
U.S. teaspoons are slightly smaller than imperial teaspoons; there are 1.2 teaspoons in an imperial teaspoon. Three-quarters of a U.S. teaspoon is equal to 0.62 imperial teaspoon, and 3/4 imperial teaspoon is 0.9 U.S. teaspoon.
Common abbreviations for the teaspoon include "t." or "tsp."