🧪 Volume & Capacity

Convert US gallons to US fluid ounces

1 gal = 128 fl oz. Convert US gallons to US fluid ounces instantly with the converter below.

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How to convert

Multiply the value (gal) by 128 to get fl oz — example: 5 gal = 640 fl oz

Conversion table

US gallons to US fluid ounces conversion table
US gallonUS fluid ounce
1 gal128 fl oz
2 gal256 fl oz
3 gal384 fl oz
4 gal512 fl oz
5 gal640 fl oz
10 gal1,280 fl oz
20 gal2,560 fl oz
25 gal3,200 fl oz
50 gal6,400 fl oz
100 gal12,800 fl oz
250 gal32,000 fl oz
500 gal64,000 fl oz
1,000 gal128,000 fl oz

About the units

The gallon here is the US gallon (3.785 L); the UK gallon is 4.546 L.

Frequently asked questions

How many US fluid ounces are in 1 US gallon?

1 gal = 128 fl oz.

How do I convert US gallons to US fluid ounces?

Multiply the value (gal) by 128 to get fl oz.

How many US gallons are in 1 US fluid ounce?

1 fl oz = 0.0078125 gal.

Which definition does this conversion use?

The gallon here is the US gallon (3.785 L); the UK gallon is 4.546 L.

Related conversions

Reverse: US fluid ounces to US gallons

US gallons to other units

US gallons to millilitersUS gallons to litersUS gallons to cubic metersUS gallons to UK gallonsUS gallons to US cupsUS gallons to tablespoonsUS gallons to teaspoons

Other units to US fluid ounces

milliliters to US fluid ouncesliters to US fluid ouncescubic meters to US fluid ouncesUK gallons to US fluid ouncesUS cups to US fluid ouncestablespoons to US fluid ouncesteaspoons to US fluid ounces

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