Is 64 oz of water a gallon?

The short answer is yes, 64 oz of water is equal to 1 gallon. Let’s explore this question in more detail.

What is a Gallon?

A gallon is a unit of measurement for volume in both the US customary units and imperial measurement systems. Specifically, 1 US gallon is equal to 128 fluid ounces (oz). Since 64 oz * 2 = 128 oz, 64 oz is exactly half of 1 gallon.

To summarize:

  • 1 gallon = 128 fluid ounces (oz)
  • 64 oz = 1/2 gallon

Therefore, 64 oz of water is equivalent to 0.5 gallons or half a gallon.

Visualizing 64 oz as Half a Gallon

It can be helpful to visualize 64 oz as half of the total 128 oz in 1 full gallon. Here is a simple table to show this:

Volume Ounces
Half a gallon 64 oz
Full gallon 128 oz

As you can see, 64 oz fills up half of the total gallon, visually showing that it equals 0.5 gallons.

Examples of 64 oz in Real Life

Here are some common examples of 64 oz quantities you may encounter:

  • Two 32 oz bottles of Gatorade = 64 oz total
  • A 64 oz growler (jug) filled with beer
  • A large 64 oz bottle of orange juice
  • Four 16 oz bottles of water = 64 oz
  • Eight 8 oz glasses of milk = 64 oz

So next time you see a 64 oz bottle or jug of liquid, you can instantly know it equals half a gallon.

Converting Between Gallons, Quarts, Pints and Cups

Since a gallon contains 128 fluid ounces, we can derive the following conversion relationships:

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

Knowing these conversions allows us to switch between measurement units easily when working with volumes of liquid in cooking and baking recipes, for example.

Gallons to Quarts

To convert gallons to quarts, simply multiply the number of gallons by 4. For example:

  • 1 gallon = 4 quarts
  • 2 gallons = 8 quarts
  • 0.5 gallons = 2 quarts

Quarts to Pints

To convert quarts to pints, multiply the number of quarts by 2. For example:

  • 1 quart = 2 pints
  • 2 quarts = 4 pints
  • 4 quarts = 8 pints

Pints to Cups

To convert pints to cups, multiply the number of pints by 2. For example:

  • 1 pint = 2 cups
  • 2 pints = 4 cups
  • 3 pints = 6 cups

Cups to Ounces

To convert cups to fluid ounces, multiply the number of cups by 8. For example:

  • 1 cup = 8 oz
  • 2 cups = 16 oz
  • 4 cups = 32 oz

Using these conversion relationships allows you to move seamlessly between volume units when needed.

Typical Uses for 1 Gallon Measurements

Here are some of the most common uses and applications for the 1 gallon (128 oz) measurement amount:


  • Milk – milk is commonly sold in 1 gallon jugs
  • Juice – orange juice and other fruit juices come in 1 gallon bottles
  • Water – 1 gallon is a convenient size to store drinking water
  • Wine – 1 gallon is equivalent to about 5 standard 750ml wine bottles


  • Stock – 1 gallon is a standard quantity to prepare stocks and broths
  • Batters & doughs – some large batch baking recipes measure volumes in gallons
  • Marinades – 1 gallon batches are convenient for marinating meats


  • Mop bucket – a 1 gallon mop bucket is a typical size
  • Laundry detergent – some detergents are sold in 1 gallon jugs
  • Bleach – liquid bleach used for disinfecting often comes in 1 gallon containers


  • Gas cans – 1 gallon gas cans are popular for storing fuel for equipment/vehicles
  • Go-karts – some small go-kart fuel tanks hold 1 gallon of gasoline
  • Lawn mowers – standard lawn mower gas tanks are often 1 gallon capacity


  • Fish tanks – 1 gallon is a common small aquarium size for betta fish
  • Water changes – aquarium experts recommend changing 1 gallon per 10 gallons total

Home Improvement

  • Paint – interior/exterior paints are sold in 1 gallon cans
  • Concrete – recipes often specify volumes in gallons
  • Drywall compound – some containers come in 1 gallon buckets

When Would You Need 64 Ounces Specifically?

While a full gallon (128 oz) is more common, there are some instances where 64 oz or half a gallon is the ideal amount:

  • Recipe requires 32 oz broth + 32 oz water = 64 oz total liquid
  • A backpacker may carry two 32 oz water bottles for a 64 oz daily supply
  • Mixing a half-gallon batch of paint color for a small touch-up job
  • Measuring out two 64 oz growlers of craft beer from a keg
  • Making a 64 oz pitcher of juice from frozen concentrate
  • Portioning French fries into 64 oz batches for consistent cooking

As you can see, there are definitely situations where the 64 oz halfway point between quarts and gallons is just the right quantity needed.

Facts About the Gallon Measurement

Here are some interesting facts and trivia about the gallon measurement:

  • The gallon was originally defined as the volume occupied by 10 pounds of water at 62 degrees Fahrenheit.
  • Queen Anne of Great Britain introduced the British Imperial gallon of 277.4 cubic inches in 1707.
  • The US gallon is derived from the British wine gallon, originally established in the 13th century.
  • The imperial gallon is about 20% larger than the US gallon.
  • The gallon was adopted as the standard US liquid measurement by Congress in 1832.
  • “Gallon” comes from the Old French word galon, meaning “gallon jug.”
  • In the past, gallons were sometimes subdivided into quarts, pottles, pints, and gills.
  • A liter is just slightly larger than 1 US quart at 33.8 ounces.
  • The gallon is the most common liquid measurement used in recipes and formulas.

The humble gallon has an interesting history indeed! Knowing key gallon facts helps give you an appreciation for this ever-important volume measurement.


In summary, 64 fluid ounces equals half a gallon or 0.5 gallons. Understanding gallon equivalencies like this allows you to visualize fluid amounts and make conversions between units such as quarts, pints and cups. Whether you are cooking, cleaning, fueling equipment or mixing paints, gallons are a handy measurement to master. So the next time you encounter a 64 oz container, you can confidently confirm it is half a gallon!

Leave a Comment