How Many Ounces In a Gallon?

Gallons to Ounces Conversion

To find out how many ounces in "x" gallons, enter a volume in gallons into the converter and the result will be displayed.

How many ounces are there in a gallon?

There are 128 ounces in a fluid gallon and 148.94 ounces in a dry gallon in US. There are 160 imperial fluid ounces in an imperial gallon in UK.

How to convert from gallons to ounces?

To convert from gallons to ounces, multiply the number of gallons "x" by 128 for US fluid gallon, 148.94 for US dry gallon and 160 for the imperial (UK) gallon.

For example, to find out how many ounces there are in 5 US fluid gallons, multiply 5 by 128, that makes 640 ounces in 5 US fluid gallons.

You may also use this volume units conversion tool to convert between US, imperial gallons and fluid ounces to find out how many ounces in "x" gallons in different countries and the measurement systems.

What is a gallon?

Gallon is an imperial and US customary measurement system volume unit. There is one type of gallon in the imperial system and 2 types (fluid and dry) in the US customary measurement system. 1 US fluid gallon is defined as 231 cubic inches, 1 US dry gallon is 268.8 cubic inches and 1 imperial gallon is 277.4 cubic inches. The abbreviation is "gal".

Gallons Conversion:

1 Gallon = 4 Quarts
1 Gallon = 8 Pints
1 Gallon = 16 Cups
1 Gallon = 256 Tablespoons
1 Gallon = 768 Teaspoons

There are 4 quarts in a gallon in US customary and the imperial system. If you would like to convert quarts and gallons please check gallons to quarts page to find out how many quarts in "x" gallons.

There are 16 cups in a gallon in US customary and the imperial system. If you would like to convert cups and gallons please check gallons to cups page to find out how many cups in "x" gallons.

What is a fluid ounce (fl oz)?

Fluid ounce is an imperial and US customary measurement system volume unit. 1 US fluid ounce equals to 29.5735 mL and 1 imperial (UK) fluid ounce equals to 28.4131 mL. The abbreviation is "fl oz".

There are 8 fluid ounces in a US cup and 10 imperial fluid ounces in an imperial cup. If you would like to convert fluid ounces and cups please check cups to ounces page to find out how many ounces in "x" cups.

The list for your reference:

1 US Fluid Gallon = 128 US Fluid Ounces
1 US Dry Gallon = 148.946 US Fluid Ounces
1 Imperial Gallon (UK) = 160 Imperial Fluid Ounces (UK)

Compare US & Imperial Gallons:

1 Imperial Gallon = 1.2 US Fluid Gallon
1 Imperial Gallon = 1.03 US Dry Gallon
1 US Fluid Gallon = 0.83 Imperial Gallon
1 US Fluid Gallon = 0.86 US Dry Gallon
1 US Dry Gallon = 0.97 Imperial Gallon
1 US Dry Gallon = 1.16 US Fluid Gallon

US Fluid Gallons to Ounces:

1/8 gal = 16 fl oz
1/4 gal = 32 fl oz
1/2 gal = 64 fl oz
1 gal = 128 fl oz
3/2 gal = 192 fl oz
2 gal = 256 fl oz
5/2 gal = 320 fl oz

Imperial Gallons to Ounces:

1/8 gal = 20 fl oz
1/4 gal = 40 fl oz
1/2 gal = 80 fl oz
1 gal = 160 fl oz
3/2 gal = 240 fl oz
2 gal = 320 fl oz
5/2 gal = 400 fl oz

For all conversions to find out how many ounces there are in "x" gallons please check the table below. If the gallons to ounces conversion value that you are looking for is not listed in the conversion table, you may also create your own custom table.

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Enter a volume in US gallons to convert into ounces:

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Gallons to Ounces Conversion Table [Fluid, US]

GallonFl. OunceGallonFl. OunceGallonFl. OunceGallonFl. Ounce
1128263328516528769728
2256273456526656779856
3384283584536784789984
45122937125469127910112
56403038405570408010240
67683139685671688110368
78963240965772968210496
810243342245874248310624
911523443525975528410752
1012803544806076808510880
1114083646086178088611008
1215363747366279368711136
1316643848646380648811264
1417923949926481928911392
1519204051206583209011520
16204841524866844810012800
17217642537667857612516000
18230443550468870415019200
19243244563269883217522400
20256045576070896020025600
21268846588871908825032000
22281647601672921630038400
23294448614473934450064000
24307249627274947275096000
2532005064007596001000128000