US gallons to US fluid ounces

Convert US gallons to US fluid ounces. Live result, plus a quick-reference table for common values.

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⇆ Convert US fluid ounces to US gallons instead

Frequently asked questions

How do I convert US gallons to US fluid ounces?

Multiply the US gallon value by 128. So 1 US gallon = 128 fl oz, and the calculator above does it instantly for any number.

How many US fluid ounces are in a US gallon?

There are 128 US fluid ounces in one US gallon. The reference table shows the conversion for common values.

Is this gal to fl oz converter free?

Yes, completely free, no sign-up, and it runs entirely in your browser, so nothing is uploaded.