The average teaspoon measurement is 1/6 of an ounce, which is also equivalent to 5 milliliters or 1/3 of a tablespoon. Knowing how to convert measurements properly is important when making recipes, especially baked goods.
Other conversions for a teaspoon include 1 1/3 U.S. fluid drams, 1/48 of a cup and 1/768 of a U.S. liquid gallon. A teaspoon that is part of a common cutlery set is shaped slightly differently than that of a teaspoon that is part of a measuring set, and may hold anywhere from 2 1/2 to 6 milliliters of liquid. Different forms of measurement exist for teaspoons as well, including level teaspoon, rounded teaspoon and heaping teaspoon.