Gallons and quarts are both units used to measure volume. A gallon is equal to 128 ounces of fluid, whereas a quart is equal to 32 ounces of fluid. This means that there are 4 quarts in a gallon.

The imperial system of units for volume

Cups, pints, quarts, and gallons are all units of the imperial system of measurement used to measure volume. 2 cups make a pint, 2 pints make a quart, and 4 quarts make a gallon.

A diagram showing how gallons, quarts, pints, and cups are related quantity wise.

Conversions between Quarts and Gallons

It is possible to convert between any quantity of quarts of gallons using the ratio of gallons to quarts, which is 1: 4

Example

Example 1. How many Quarts in half a Gallon?

Answer:

Using simple ratios we can find:

1 \text{ Gallon} : 4 \text{ Quarts}

\frac{1}{2} \text{ Gallon} : \frac{4}{2} \text{Quarts}

\frac{1}{2} \text{ Gallon} : 2 \text{ Quarts}

So, half a gallon is equivalent to 2 quarts.

Formula for Quarts and Gallons

The formula that can be used for the conversion is:

\text {Volume in Quarts} = \text {Volume in Gallons} \times 4

To find the number of gallons given the volume in quarts, rearrange the formula with “volume in gallons” as the subject,

\text {Volume in Gallons} = \frac {\text {Volume in Quarts}}{4}

Question

Question 1. Convert 12 Quarts to Gallons.

Solution:

Step 1. Obtain the relevant conversion formula

To determine the volume in gallons, we can use the formula:

\text {Volume in Gallons} = \frac {\text {Volume in Quarts}}{4}

Step 2. Substitute the known quantity in the formula

Substitute 12, for the volume in Quarts in the formula

\text{Volume in Gallons} = \frac{12}{4}

\text{Volume in Gallons} = 3

So, 12 Quarts is equal to 3 gallons.

Conversions between Quarts and Cups

Question

Question 2. How many cups are in a quart?

Solution:

1 \text{ Pint} = 2 \text{ Cups}

2 \text{ Pints} = 2 \times 2 \text{ Cups}

2 \text{ Pints} = 4 \text{ Cups}

\text{The volume of 2 pints is equivalent to 1 quart.}

\text{Therefore,}

1\text{ Quart} = 4 \text{ Cups}

A visual demonstration of the conversion between cups and quarts step by step

Hence, there are 4 cups in a quart and the ratio between quarts to cups is 1:4.

Question

Question 3. Convert 4 quarts to cups.

Solution:

Using the ratio 1:4 between quarts and cups we can determine how many cups are equivalent to 4 quarts in volume.

1 \text{ Quart} = 4 \text{ Cups}

4 \text{ Quarts} = 4 \times 4 \text{ Cups}

4 \text{ Pints} = 16 \text{ Cups}

Therefore, 4 quarts is equal to 16 cups by volume.