To convert quarts to gallons, you can use the conversion factor that 4 quarts is equal to 1 gallon.
To find out how many gallons are in 12 quarts, you can divide 12 by 4:
\[ \text{Gallons} = \frac{12 \text{ quarts}}{4 \text{ quarts/gallon}} = 3 \text{ gallons} \]
So the answer is 3 gallons.