Volume

What is a Gallon? (gal)

Definition

A gallon is a unit of volume in both the imperial and US customary systems, though they differ slightly in size. The US gallon equals 3.785 liters, while the imperial (UK) gallon equals 4.546 liters. Gallons are primarily used in the United States for fuel, milk, and other large liquid quantities.

Common Uses

  • › Fuel and gasoline in the US
  • › Milk and large beverage containers
  • › Swimming pool and tank capacity
  • › Paint and chemical quantities

Converters

Gallons to Liters →

Key Facts

  • Symbol
    gal
  • Category
    Volume
  • 1 US gal = 3.785 L
  • 1 US gal = 128 fl oz
  • 1 US gal = 16 cups
  • 1 UK gal = 4.546 L

Related Terms

About the Gallon

A gallon is a unit of volume in both the imperial and US customary systems, though they differ slightly in size. The US gallon equals 3.785 liters, while the imperial (UK) gallon equals 4.546 liters. Gallons are primarily used in the United States for fuel, milk, and other large liquid quantities.

Equivalents and conversions

  • 1 US gal = 3.785 L
  • 1 US gal = 128 fl oz
  • 1 US gal = 16 cups
  • 1 UK gal = 4.546 L

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