1 Teaspoon =
(rounded to 6 significant digits)
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A U.S. teaspoon is a unit of volume equal to 1/3rd of a tablespoon or 1/48th of a U.S. cup.
A U.S. gallon is equal to 128 U.S. fluid ounces, or about 3.785 liters. It should not be confused with the imperial gallon used in the United Kingdom.