Convert US gallon to US fluid ounce

Here you can quickly calculate how many US fluid ounce fit in one US gallon.

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Conversion from US gallon to US fluid ounce example

Starting value Increment Accuracy

To convert US gallon to US fluid ounce, multiply by 128.

1 gal = 128 fl oz

Example: 1 US gallon = 128 US fluid ounce

'Gallon' names two different measures: the US gallon is about 3.785 liters and the imperial gallon about 4.546 liters, a full 20% larger. US fuel figures and UK recipes therefore use different gallons. Always check the country before converting.
A fluid ounce measures volume, not weight. The US fl oz is about 29.57 ml and the imperial fl oz about 28.41 ml, and neither matches the weight ounce (28.35 g) except roughly for water. Measure liquids in milliliters to avoid the ambiguity.

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2.5 US gallon equals 320 US fluid ounce.

Correct answer: 2.5 US gallon = 320 US fluid ounce.

6 US gallon equals 1.54e+3 US fluid ounce.

Correct answer: 6 US gallon = 768 US fluid ounce.

20.7 US fluid ounce equals 0.323 US gallon.

Correct answer: 20.7 US fluid ounce = 0.162 US gallon.

50 US fluid ounce equals 0.234 US gallon.

Correct answer: 50 US fluid ounce = 0.391 US gallon.