Unit Definition (Tablespoon [US])
The tablespoon is a unit of volume used in food recipes. In the U.S., the tablespoon is equal to 1/2 fluid ounce; this is about 14.8 milliliters. In Canada, the traditional tablespoon is 1/2 Imperial fluid ounce (14.2 milliliters). The U.S. tablespoon equals 3 teaspoons or 1/16 cup.

Unit Definition (Teaspoon [UK])
The teaspoon is a unit of volume used in food recipes. In Britain, a traditional teaspoonful in the kitchen was equal to 1/8 Imperial fluid ounce or approximately 3.55 milliliters, but the medical teaspoonful was usually 5 milliliters.