Conversion formula

The conversion factor from quarts to gallons is 0.25, which means that 1 quart is equal to 0.25 gallons:

1 qt = 0.25 gal

To convert 18 quarts into gallons we have to multiply 18 by the conversion factor in order to get the volume amount from quarts to gallons. We can also form a simple proportion to calculate the result:

1 qt → 0.25 gal

18 qt → V_(gal)

Solve the above proportion to obtain the volume V in gallons:

V_(gal) = 18 qt × 0.25 gal

V_(gal) = 4.5 gal

The final result is:

18 qt → 4.5 gal

We conclude that 18 quarts is equivalent to 4.5 gallons:

18 quarts = 4.5 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.22222222222222 × 18 quarts.

Another way is saying that 18 quarts is equal to 1 ÷ 0.22222222222222 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that eighteen quarts is approximately four point five gallons:

18 qt ≅ 4.5 gal

An alternative is also that one gallon is approximately zero point two two two times eighteen quarts.

Conversion table

quarts to gallons chart

For quick reference purposes, below is the conversion table you can use to convert from quarts to gallons