How many Ounces are in a Gallon?

It depends on where you are. Despite the similar name, all Gallons aren't equal. The US Gallon is smaller than the UK imperial Gallon.

  • 1 US Fluid Gallon = 128 US Fluid Ounces.
  • 1 UK Fluid Gallon = 160 UK Fluid Ounces.

Gallons to Ounces Calculator

Gallons:
Gallons
Method:

Result:

Fluid Ounces

Calculator Formula

  • Fluid Ounces = US Gallons * 128
  • Fluid Ounces = UK Gallons * 160

See also: