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Gallon (gal)

Course: 
3rd Grade

A customary unit for measuring capacity.

Meaning

A measure of capacity, typically (but not necessarily) liquid, equal to sixteen cups, or four quarts.

From... To... Quarts Cups
1 cup 8 oz (8 ounces) 1 / 4 20
1 pint 2c (2 cups) 1 / 2 21
1 quart 4c (2 pints) 1 22
1 half gallon 8c (2 quarts) 2 23
1 gallon 16c (2 half gallons) 4 24

For more detail, see "Gallon" on Rowland's Dictionary of Units of Measurement.