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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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  • 1 gal = 128 fl oz
  • 1 fl oz = 0.007813 gal

Example: US gallon to US fluid ounce

  • 1 US gallon = 128 US fluid ounce

US gallon to US fluid ounce conversion table

US gallon US fluid ounce
1 128
2 256
5 640
10 1280
20 2560
50 6400
100 12800

US gallon to US fluid ounce formula

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

1 gal = 128 fl oz
Example: 1 US gallon = 128 US fluid ounce

Common volume conversion mistakes

  • '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.

Quick US gallon and US fluid ounce conversion quiz

Score: 0

209 US fluid ounce equals 1.63 US gallon.

Correct answer: 209 US fluid ounce = 1.63 US gallon.

182 US fluid ounce equals 1.42 US gallon.

Correct answer: 182 US fluid ounce = 1.42 US gallon.

19.4 US fluid ounce equals 0.152 US gallon.

Correct answer: 19.4 US fluid ounce = 0.152 US gallon.

146 US fluid ounce equals 1.14 US gallon.

Correct answer: 146 US fluid ounce = 1.14 US gallon.

14.7 US fluid ounce equals 0.115 US gallon.

Correct answer: 14.7 US fluid ounce = 0.115 US gallon.

More volume conversions