To convert gallons to liters, you can use the conversion factor where 1 gallon is approximately equal to 3.78541 liters.
So, to convert 3 gallons to liters:
\[ 3 \text{ gallons} \times 3.78541 \text{ liters/gallon} \approx 11.35623 \text{ liters} \]
Therefore, 3 gallons is approximately 11.36 liters.