Skill: Convert customary capacity units

Explanation and Free Practice Resources

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.

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Detailed Explanation: Convert customary capacity units

Customary capacity units measure how much liquid a container can hold. The important relationships are:

$8$ fluid ounces $=1$ cup
$2$ cups $=1$ pint
$2$ pints $=1$ quart
$4$ quarts $=1$ gallon

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 $3$ quarts to cups.

Start with the fact that $1$ quart equals $2$ pints:

3\text{ quarts}\times 2=6\text{ pints}

Each pint equals $2$ cups:

6\text{ pints}\times 2=12\text{ cups}

Therefore,

3\text{ quarts}=12\text{ cups}

The amount of liquid stays the same; only the unit name changes.

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Measurement Conversion - Customary Volume Units with Sub Units

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