How many fl oz equal a quart?

In the United States, a quart is a unit of volume equal to 32 fluid ounces. This means that 32 fluid ounces equals 1 quart exactly. To convert between fluid ounces and quarts, you simply need to know this basic relationship.

Quick Answer

32 fluid ounces equals 1 quart.

What is a Fluid Ounce?

A fluid ounce is a unit of volume used in both the US customary system and the British imperial system. It is abbreviated as fl oz or oz fl.

A US fluid ounce is defined as exactly 1/128 of a US gallon. Since a US gallon is equal to exactly 231 cubic inches, 1 fluid ounce works out to exactly 1.804688 cubic inches.

In the British imperial system, 1 fluid ounce is defined as 1/160 of an imperial gallon. An imperial gallon is approximately 277.42 cubic inches, so 1 British fluid ounce is about 1.7339 cubic inches.

What is a Quart?

A quart is unit of volume in both the US customary system and the British imperial system. It is equal to 2 pints or 4 cups.

In the US customary system, 1 quart is defined as exactly 57.75 cubic inches. Since there are 128 fluid ounces in a gallon and 4 quarts in a gallon, 1 US quart is equal to 32 fluid ounces.

In the imperial system, 1 quart is defined as 69.354 cubic inches. With 160 fluid ounces in an imperial gallon and 4 quarts per gallon, 1 imperial quart equals 40 fluid ounces.

US Fluid Ounces to Quarts Conversion

To summarize:

  • 1 US gallon = 231 cubic inches
  • 1 US gallon = 4 quarts
  • 1 US gallon = 128 fluid ounces
  • 1 US quart = 57.75 cubic inches
  • 1 US quart = 32 fluid ounces

So in the US customary system:

32 fluid ounces = 1 quart

Some other useful conversions are:

  • 16 fluid ounces = 1 pint
  • 8 fluid ounces = 1 cup
  • 1 fluid ounce = 2 tablespoons = 6 teaspoons

Calculating Fluid Ounces and Quarts

You can use these relationships to calculate between fluid ounces and quarts:

To convert fluid ounces to quarts:

Fluid ounces ÷ 32 = Quarts

For example:

64 fluid ounces ÷ 32 = 2 quarts

To convert quarts to fluid ounces:

Quarts x 32 = Fluid ounces

For example:

2 quarts x 32 = 64 fluid ounces

Examples of Fluid Ounce and Quart Conversions

Here are some examples of converting between fluid ounces and quarts:

Fluid Ounces Quarts
32 fl oz 1 quart
16 fl oz 1/2 quart
64 fl oz 2 quarts
80 fl oz 2 1/2 quarts
96 fl oz 3 quarts

And going the other way:

Quarts Fluid Ounces
1 quart 32 fl oz
2 quarts 64 fl oz
3 quarts 96 fl oz
4 quarts 128 fl oz
5 quarts 160 fl oz

Fluid Ounces, Milliliters and Liters

When converting between fluid ounces and milliliters (mL) or liters (L):

  • 1 US fluid ounce = 29.5735 mL
  • 1 US fluid ounce = 0.0295735 L


32 fl oz x 29.5735 mL = 946 mL

32 fl oz x 0.0295735 L = 0.946 L


1 L = 33.814 fl oz

946 mL = 32 fl oz

Converting Between Systems

Since a US quart and an imperial quart are not equivalent, you need to pay attention to which system you are using when converting fluid ounces and quarts.

1 US quart = 32 US fluid ounces


1 imperial quart = 40 imperial fluid ounces

So if you have an imperial quart measurement that you want to convert to US fluid ounces, you would do:

1 imperial quart x 40 imperial fl oz x 1.04084 US fl oz / 1 imperial fl oz = 41.34 US fl oz

Going the other way, if starting with US fluid ounces:

32 US fl oz x 0.96076 imperial fl oz / 1 US fl oz = 30.72 imperial fl oz = 0.768 imperial quarts

Using Fluid Ounce and Quart Measurements

Knowing the basic conversions between fluid ounces, quarts, cups, pints, gallons and milliliters allows you to substitute one unit for another in recipes and measurements.

Some examples:

  • If a recipe calls for 32 fluid ounces (1 quart) of milk, you could substitute that with 1 quart of milk
  • If you have a liter of juice, you could say that’s about 33.8 fluid ounces or approximately 1 1/4 quarts
  • A 64 fl oz (half gallon) bottle of orange juice contains 2 quarts or 8 cups of juice

Fluid ounces and quarts are convenient units for measuring volumes of liquids, especially for cooking and nutrition purposes. Knowing the basic conversions allows you to adjust any recipe or measurement as needed.


In summary:

  • A quart is equal to 32 fluid ounces in the US customary system
  • To convert between fluid ounces and quarts, divide or multiply by 32
  • There are different conversion factors for the imperial system
  • Milliliters and liters can also be converted to and from fluid ounces
  • These volume conversions allow flexibility in recipes and measurements

So the quick answer to “how many fluid ounces are in a quart?” is 32 fluid ounces. Knowing the relationships between units of volume allows you to convert as needed for your particular application.

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