clear measuring glass

“How many oz in a gallon?” is probably something you’ve Googled after reading a recipe asking for 32 oz of milk or water. It’s a common question bakers in particular, but knowing how to convert is is as essential as comprehending cups to grams conversions.

To provide a short and simple answer, 128 ounces is the key measurement. 1 gallon is 128 ounces.

Now, let’s dive into the details of what an ounce means in the world of liquid and dry measurements.

Here is a reference table that you can use when finding the same amounts for liquids from metric to English units.

Gallons (gal)Quarts (qt)Pints (pt)Fluid Ounces (fl oz)CupsTablespoon (tbsp)TeaspoonMilliliters (ml)

What is an Ounce?

In the United States, an ounce is a unit of weight and commonly abbreviated as “oz”. The ounce is a versatile measurement, widely used in cooking, baking, and other day-to-day activities, providing a precise way to quantify the weight of dry ingredients or the volume of liquids.

US Fluid Ounce vs. Imperial (UK) Fluid Ounce: What’s the difference?

When it comes to fluid ounces, there’s a difference between the US and the UK. The US fluid ounce is slightly smaller than the Imperial fluid ounce. Just to make it more complicated, of course!

What’s the actual difference? To be precise, 1 US fluid ounce = 1.041 Imperial fluid ounces. While the difference may seem small, it can make a significant impact in precise measurements, especially in large quantities.

US Fluid Ounce

1 US fluid ounce is approximately 29.57 milliliters. The United States uses the US Fluid Ounce as a unit of volume to measure liquids and it finds common application in recipes, nutrition labels, and everyday measurements.

Imperial (UK) Fluid Ounce

1 Imperial fluid ounce is approximately 28.41 milliliters. The United Kingdom and other Commonwealth countries use the Imperial fluid ounce as a unit of volume. It is commonly used in British recipes, nutritional information, and everyday liquid measurements.

How much Oz is in a Gallon?

Moving on to gallons, understanding their volume is crucial. In the United States, a gallon contains 128 fluid ounces. While if we use, imperial fluid ounce, 1 gallon is equivalent to 160 fluid oz.

Chart for converting US and Imperial fluid ounces into gallons.

If we use the information above in converting US fluid ounce and Imperial fluid ounce into gallon, we can come up with this conclusion:

GallonsUS Fluid OunceImperial (UK) Fluid Ounce
1/4 gallon (0.25)32 fluid oz30.74 fluid oz
1/2 gallon (0.5)64 fluid oz61.48 fluid oz
3/4 gallon (0.75)96 fluid oz92.25 fluid oz
1 gallon128 fluid oz123.2 fluid oz
2 gallons256 fluid oz246.4 fluid oz
3 gallons384 fluid oz369.34 fluid oz

Wet Vs. Dry Gallon? What’s the difference?

Gallons can be categorized into wet and dry measurements.

Wet Gallon serves as the standard measurement for liquids. In the United States, it consists of 128 fluid ounces. This measurement is commonly used for measuring water, milk, or any other liquid in recipes or daily activities.

Dry Gallon is used for measuring dry ingredients like flour, sugar, or grains. Unlike the wet gallon, there isn’t a universally accepted dry gallon. However, the U.S. dry gallon is around 4.40 liters.

FAQs about ounce to gallon

How many Oz in a half gallon?

64 oz.

How many 32 oz in a gallon?

4 quarts (4 x 32 oz. (a quart) = 128 oz.)

How many 16 oz in a gallon?

8 pints (8 x 16 oz. (a pint) = 128 oz.)

How many 8 oz in a gallon?

There are 16 servings of 8 oz. in a gallon.

How many ounces are in a gallon of milk?

128 oz.

How many ounces are in a gallon of ice cream?

128 oz.