Unitly

volume conversion

How many fluid ounces are in 1 gallon?

Quick answer, a live calculator, and reference values for converting gallons to fluid ounces.

Main answer
1 gallon = 128 fluid ounces
Result
1 gallon = 128 fluid ounces

Factor: 128

There are 128 fluid ounces in 1 gallon.

1 gallon equals 128 fluid ounces. A gallon is a common volume unit for liquids and recipe measurements. A fluid ounce is another volume unit you'll often see in kitchens and packaging. To convert any amount, multiply the number of gallons by 128 to get fluid ounces. Results below use standard international conversion factors; round as needed for recipes or construction.
Need the other direction?
Convert fluid ounces to gallons.

Examples

  • 1 gallon
    128 fluid ounces
  • 5 gallons
    640 fluid ounces
  • 10 gallons
    1,280 fluid ounces
  • 100 gallons
    12,800.01 fluid ounces

Frequently asked questions

How many fluid ounces are in 1 gallon?
There are 128 fluid ounces in 1 gallon.
How do I convert gallons to fluid ounces?
Multiply the gallons value by 128. You can also type any number into the calculator on this page for an instant result.
Is the gallons to fluid ounces conversion exact?
This page uses internationally recognized conversion factors. Displayed values may be rounded for readability—keep extra decimals when a recipe, blueprint, or lab measurement needs higher precision.

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