There are 128 fluid ounces in a gallon. This conversion applies to both U.S. and Imperial (UK) gallons.
What Is An Ounce?
An ounce is a unit of measurement used in both weight and volume. In the U.S. customary system, it measures weight (avoirdupois ounce) and liquid volume (fluid ounce). The weight ounce is used for solids, while the fluid ounce is used for liquids
- Weight: In the US customary system, an ounce is 1/16 of a pound.
- Volume: In the US customary system, a fluid ounce is 1/16 of a liquid pint.
Fluid Ounces vs. Dry Ounces
Fluid ounces are used to measure liquids, while dry ounces are used to measure solids.
- Fluid ounces: Commonly used for beverages, liquid medications, and recipes.
- Dry ounces: Commonly used for ingredients like flour, sugar, and spices.
U.S. Ounces vs. Imperial Ounces
U.S. ounces are used in the United States and are equivalent to 29.5735 milliliters in volume. Imperial ounces, used in the UK, are equivalent to 28.4131 milliliters in volume.
US ounces and Imperial ounces are slightly different
- US fluid ounce: 1/16 of a US liquid pint, approximately 29.5735 milliliters.
- Imperial fluid ounce: 1/20 of an Imperial liquid pint, approximately 28.4131 milliliters
What Is A Gallon?
A gallon is a unit of volume measurement used to quantify liquids. In the U.S., it equals 128 fluid ounces or about 3.785 liters. The Imperial gallon, used in the UK, equals 160 Imperial fluid ounces, or about 4.546 liters.
Wet Gallons vs. Dry Gallons
Wet gallons are used to measure liquids, while dry gallons are used to measure solids.
- Wet gallons: Commonly used for liquids like milk, water, and gasoline.
- Dry gallons: Less commonly used, but can be used for measuring dry goods like grains or fruits.
The main difference between wet and dry gallons is their volume. A dry gallon is slightly larger than a wet gallon
U.S. Gallons vs. Imperial Gallons
US gallons and Imperial gallons are slightly different units of volume.
- US gallon: Equal to 128 US fluid ounces or 3.785 liters.
- Imperial (UK) gallon: Equal to 160 Imperial fluid ounces or 4.546 liters.
An Imperial gallon is larger than a US gallon by about 20%. This difference can be significant, especially when dealing with larger quantities of liquid.
Quick Ounces to Gallon Conversions
16 ounces is 1/8 gallon.
32 ounces is 1/4 gallon.
50 ounces is 0.625 gallon.
64 ounces is 1/2 gallon.
80 ounces is 0.625 gallon.
96 ounces is 0.75 gallon.
100 ounces is 0.781 gallons.
120 ounces is 0.9375 gallons.
128 ounces is 1 gallon.
136 ounces is 1.0625 gallons.
221 ounces is 1.734 gallons.
270 ounces is 2.125 gallons.
768 ounces is 6 gallons.
Ounces in Common Gallon Measurements
How many ounces in a half gallon?
There are 64 ounces in a half-gallon.
How many ounces in a gallon of gas?
There are 128 fluid ounces in a gallon of gasoline.
How many ounces in a gallon of water?
There are 128 fluid ounces in a gallon of water.
How many ounces in a gallon of milk?
There are 128 fluid ounces in a gallon of milk.
How many ounces in a gallon of ice cream?
There are 128 fluid ounces in a gallon of ice cream.
How many ounces in a gallon-half-gallon?
A gallon is 128 fluid ounces, so a half-gallon is 64 fluid ounces.
How many ounces in a gallon of liquid?
There are 128 fluid ounces in a gallon of any liquid.
How many ounces in a gallon of oil?
There are 128 fluid ounces in a gallon of oil.