How to Convert Quarts to Gallons
To convert US quarts to US gallons, you divide the volume by 4. This is because there are exactly 4 quarts in 1 gallon.
The quart (qt) is a unit of volume in the US customary systems. There are two main types of quarts: the liquid quart and the dry quart, but in most everyday situations, "quart" refers to the liquid quart. The US gallon (gal) is defined as 231 cubic inches.
Example: Suppose you have 12 quarts of liquid. To find how many gallons that is:
12 quarts ÷ 4 = 3 gallons
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