Is 64 oz a half gallon of milk?

Yes, 64 fluid ounces (oz) is equal to half a gallon of milk. There are 128 fluid ounces in a gallon, so half of 128 oz is 64 oz. This means if you have a 64 oz container of milk, you have half a gallon.

Quick Answer

64 oz = Half gallon of milk

How many ounces are in a gallon?

There are 128 fluid ounces (oz) in a gallon. A gallon is a standard unit of measurement used for liquids in the US Customary System.

Here is a breakdown of the units:

  • 1 gallon = 4 quarts
  • 1 quart = 2 pints
  • 1 pint = 2 cups
  • 1 cup = 8 fluid ounces

So if we multiply it out:

1 gallon = 4 quarts x 2 pints x 2 cups x 8 oz = 128 oz

Therefore, a gallon contains a total of 128 fluid ounces.

What are the equivalents of 64 oz?

Here are the equivalent measurements for 64 fluid ounces:

  • 64 oz = Half gallon
  • 64 oz = 2 quarts
  • 64 oz = 4 pints
  • 64 oz = 8 cups

Since there are 128 oz in a gallon, 64 oz equates to half a gallon, which is the answer to the original question.

Examples of 64 oz containers

Here are some common examples of 64 oz containers filled with milk:

  • Half gallon milk jug – The standard size for half gallon milk containers is 64 oz.
  • Two 32 oz quart bottles – Some brands sell quart sizes (32 oz) which would equal 64 oz if you buy two.
  • Large reusable water bottle – Reusable water bottles around 64 oz are commonly used for milk.
  • Four 16 oz pint cartons – 64 oz equals four 16 oz pint sized cartons.
  • Eight 8 oz single serve cups – You could get 64 oz worth in eight 8 oz cups.

Why is a half gallon of milk 64 oz?

The reason a half gallon of milk is equal to 64 oz is because of how a gallon is defined in the US Customary System:

  • A gallon contains 128 fluid ounces.
  • To get half of any number, you divide it by 2.
  • Therefore, half of 128 oz is 128 / 2 = 64 oz.

So based on the definition of a gallon, half a gallon has to be 64 oz.

Is a 64 oz milk container really half a gallon?

Yes, any 64 oz container labeled as “half gallon” does in fact contain half a gallon of milk. However, there are a few things to note:

  • Some 64 oz containers may be filled a bit over or under 64 oz due to production variance.
  • Temperature affects liquid volume so cold milk takes up slightly less space.
  • Some regions may define gallons differently so always check the total ounces.

But in general, a 64 oz milk container is intended to hold exactly half a gallon, which is the equivalent of 64 fluid ounces.

Does the size of the container affect the volume?

The size and shape of the container does not affect the actual volume of liquid it holds. For example:

  • A half gallon bottle may be short and wide or tall and narrow.
  • A half gallon jug has a handle while a carton does not.
  • But both still hold 64 oz of milk.

The external dimensions of the containers can vary but the standardized internal volume will be 64 fluid ounces in both cases.

Common uses for 64 oz of milk

Here are some common uses for 64 oz or half a gallon of milk:

  • Cereal – Around 1.5 to 2 weeks worth of milk for cereal for one person.
  • Drinking – 4 to 8 days worth of drinking milk for one person.
  • Coffee/tea – Around 32 cups of coffee or tea with 2 oz milk per cup.
  • Baking – Several recipes worth of milk-based baked goods like cakes or cookies.
  • Cooking – Milk for recipes like mashed potatoes, creamed soups, sauces, etc.

The uses really depend on the needs of the individual or family and how much milk they typically go through.

Is it better to buy half gallons of milk?

Here are some pros and cons of buying half gallon (64 oz) containers of milk versus other sizes:


  • Good for 1-2 people – Half gallons provide enough milk without waste.
  • Better price per ounce – Buying bigger sizes usually costs less per ounce.
  • Reseals easily – Half gallon jugs can be resealed and stored easily.
  • Pouring convenience – Wider mouth makes pouring easier.
  • Environmentally friendly – Produces less packaging waste than smaller containers.


  • Goes bad quicker – Must be consumed within 5-7 days of opening.
  • Heavy to lift – Can be difficult to lift and pour near empty.
  • Not good for storage – Takes up more space in fridge.
  • Not ideal for one – Too much milk if only one person drinking it.

Overall, half gallon milk containers are a good choice for 1-2 milk drinkers looking for the best value. Smaller or larger sizes may be better suited depending on individual needs.

Tips for storing 64 oz of milk

To get the longest freshness out of 64 oz of milk once opened, follow these storage tips:

  • Keep refrigerated at 40°F or below.
  • Screw the cap on tightly after each use.
  • Store milk towards the back of the fridge where it’s coldest.
  • If possible, pour milk into a smaller container once opened.
  • Check the “sell by” or “use by” date and follow it.
  • Use within 5-7 days for best quality.
  • Keep the spout and rim of the container clean when pouring.

Properly stored in the fridge, unopened 64 oz milk will last 5-7 days past the printed date, and opened milk will stay fresh for another 5-7 days.

Fun facts about milk

  • It takes about 350 squirts from a cow’s udder to produce one gallon of milk.
  • The average American drinks around 20 gallons of milk per year.
  • The “Got Milk?” ad campaign helped boost milk sales in the US by 11%.
  • May 11th is National Chocolate Milk Day.
  • 7.2 million Americans have a milk allergy.
  • Milk comes in over 6 different varieties like whole, 2%, and skim.
  • Raw cow’s milk contains about 3.5% milk fat.


In summary, 64 fluid ounces equals half a gallon of milk or 4 quarts or 8 pints, etc. Any 64 oz milk container is intended to hold exactly half a gallon of milk. While the size and shape of the containers may vary, 64 oz is 64 oz. Half gallon milk jugs provide a good amount of milk for 1-2 people at a low price per ounce. Just be sure to store milk properly and consume within a week of opening. And now you know for sure that the answer is yes – 64 oz is equivalent to half a gallon of milk!

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