Gallons to Ounces Conversion

How many ounces in a gallon?

There are 128 ounces in a gallon (128 oz in 1 gal) in US and 160 ounces in a gallon in UK. To find out how many ounces in "x" gallons, multiply the number of gallons "x" by 128 for US or 160 for UK.

To convert gallons to ounces you may also use the conversion tool below. Simply enter the volume in gallons into the converter and the result will be displayed. You may also check the gallons to ounces conversion table and create your own custom table.

1 Gallon [Fluid, US] = 128 Ounces [Fluid, US]
1 Gallon [Dry, US] = 148.946 Ounces [Fluid, US]
1 Gallon [UK] = 160 Ounces [UK]

There are 128 ounces in a gallon, because from the largest to the smallest units between gallons and ounces, there are 4 quarts in a gallon, 2 pints in a quart, 2 cups in a pint and 8 ounces in a cup, that makes 4 * 2 * 2 * 8 = 128 ounces in a gallon.

For example, to find out how many ounces there are in a gallon and a half, multiply the number of gallons by the conversion factor, that makes 1.5 gal * 128 = 192 ounces in 1.5 gallons.

Gallon and fluid ounce are US customary and imperial (UK) systems volume units. In US customary one gallon equals to 128 fl. ounces and in imperial (UK) system one gallon equals to 160 fl. ounces. The abbreviation for gallon is "gal" and for fluid ounce is "fl oz".

One US fluid gallon is defined as 231 cubic inches and one US dry gallon is 268.8 cubic inches. An imperial gallon is 277.4 cubic inches. One US fluid ounce equals to 29.5 mL and one imperial ounce equals to 28.4 mL.

Converter

Enter a US gallon value to convert into ounces and click on the "convert" button.

Create Custom Conversion Table

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