How Many Fl Oz in a Gallon?

Convert US Gallons to Fluid Ounces

How Many Fl Oz in a Gallon?

Convert
Gallons to Fluid Ounces

How to convert US gallons to US fluid ounces

Worked example: 1 gal = 128 fl oz

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1 gal × 128 = 128 fl oz

Rule: US fluid ounces = US gallons × 128 — exact: 1 gal = 128 fl oz.

See Also

FAQ

How many fluid ounces are in a gallon?

One US gallon is equal to 128 US fluid ounces (1 gal = 128 fl oz).

What is the formula to convert gallons to fl oz?

To convert US gallons to fluid ounces, multiply the gallon value by 128. For example, 2 gal × 128 = 256 fl oz.

How many fluid ounces are in a half gallon?

A half US gallon is 64 fluid ounces (0.5 × 128 = 64 fl oz), and a quarter gallon (one quart) is 32 fl oz.