teaspoon (US) Unit Converter

Definition of teaspoon (US) unit

A US teaspoon is a customary unit of volume equal to 1/3 US tablespoon, conventionally measuring 4.92892 milliliters. In cooking and medicine, it commonly represents a small standardized quantity of liquid or finely divided substance.

History of teaspoon (US) unit

The teaspoon developed from the small spoons used for stirring and serving tea in Europe, especially after tea became fashionable during the seventeenth and eighteenth centuries. Its capacity varied considerably between households and countries. In the United States, customary kitchen measures gradually standardized around the tablespoon and teaspoon, with three teaspoons making one tablespoon. Modern US measurement references define a teaspoon as approximately 4.93 milliliters, although older recipes and household spoons may differ. The unit remains customary rather than metric, despite widespread metric labeling today.

Applications of teaspoon (US) unit

US teaspoons are used in recipes to measure small amounts of liquids and ingredients such as vanilla, spices, salt, baking powder, or sweeteners. They also appear on medication instructions, where a calibrated dosing spoon is preferred over ordinary cutlery. For conversions, one teaspoon equals one third of a tablespoon, 4.92892 mL, and is often rounded to 5 mL in practice.

Complete list of teaspoon (US) unit conversion