A gallon is a unit of volume in the US Customary System, while a liter is a unit of volume in the International System of Units (SI).

- 1 gallon (gal) is approximately equal to 3.785 liters (L).

- 1 liter (L) is approximately equal to 0.264 gallons (gal).

Therefore, 10 gallons is bigger than 10 liters.