See also kitchen measures.

An unofficial unit of liquid and dry measure, = 3 teaspoons in the United States and 4 teaspoons in Britain. opens a new page containing a chart that shows relationships between this unit and other units in its system  In the United States, a tablespoon is ½ U.S. fluid ounce, approximately 14.786351 milliliters. For purposes of food labeling, the Food and Drug Administration defines a tablespoon as 15 mL (21 CFR 101.9(b)(5)(viii)). Abbreviation, tbsp, T.

In Britain, a tablespoon is ½ imperial fluid ounce, approximately 14.21 milliliters. But see kitchen measures. An English pharmacopeia of 1618 described the tablespoon as the volume of distilled water weighing 3 drachms, about 12 mL.

Most tablespoon measures sold today, largely for kitchen use, are marked 15 mL.

Chauncey Leake, a pharmacologist who became interested in ancient Egyptian medicine, remarks “I have examined many such [ancient Egyptian] spoons in archaeological museums, and they all hold between 14 and 15 milliliters.”¹ Very likely 14 to 17 mL is approximately the capacity of the largest container that fits comfortably into the human mouth.

1. Chauncey D. Leake.
Standards of measurement and nursery rhymes.
in Systems of Units. National and International Aspects.
Carl F. Kayan, editor.
Publication No. 57 of the AAAS.
Washington, D. C.: American Association for the Advancement of Science, 1959.
Page 38.

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