Gallons to Ounces Conversion - How many ounces in a gallon?

1 US fluid gallon = 128 US fluid ounces. 1 Imperial gallon (UK) = 160 imperial fluid ounces.

Round:
Enter US Fluid Gallon
Enter US Fluid Ounce
Enter Imperial Gallon
Enter Imperial Fluid Ounce

How many ounces are there in a gallon?

There are 128 ounces in a US fluid gallon and 148.946 ounces in a US dry gallon. 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, as a formula multiply the number of gallons "x" by 128 for US fluid gallon, 148.946 for US dry gallon and 160 for the imperial (UK) gallon.

To find out how many US fluid ounces in "x" US fluid gallons, as a formula multiply the US fluid gallon value "x" by 128.

US Fluid Ounce = US Fluid Gallon × 128

To find out how many US fluid ounces in "x" US dry gallons, as a formula multiply the US dry gallon value "x" by 148.946.

US Fluid Ounce = US Dry Gallon × 148.946

To find out how many imperial fluid ounces in "x" imperial gallons, as a formula multiply the imperial gallon value "x" by 160.

Imperial Fluid Ounce = Imperial Gallon × 160

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

February 8, 2019

Create Custom Conversion Table
To create your own custom conversion table click "Create Table" botton. To change values, you may enter a "Start" value (1, 2.5, 5 etc), select a an "Increment" value (0.01, 5, 100 etc) and select an "Accuracy" value to round the result.