Understanding customary capacity as a system of equivalent units—fluid ounces, cups, pints, quarts, and gallons—includes knowing that 8 fluid ounces equal 1 cup, 2 cups equal 1 pint, 2 pints equal 1 quart, and 4 quarts equal 1 gallon. Quantities can be converted by multiplying or dividing by these factors while preserving the measured amount and labeling the resulting unit; the scope is limited to straightforward whole-number and familiar fractional conversions, not less-common units or generalized dimensional analysis.
Customary capacity units measure how much liquid a container can hold. The important relationships are:
To convert units, use the relationship between the units. Multiply when changing to a smaller unit, because you will have more smaller units.
Example: Convert quarts to cups.
Therefore,
The amount of liquid stays the same; only the unit name changes.
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