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 638 quarts into gallons we have to multiply 638 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

638 qt → V_(gal)

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

V_(gal) = 638 qt × 0.25 gal

V_(gal) = 159.5 gal

The final result is:

638 qt → 159.5 gal

We conclude that 638 quarts is equivalent to 159.5 gallons:

638 quarts = 159.5 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.006269592476489 × 638 quarts.

Another way is saying that 638 quarts is equal to 1 ÷ 0.006269592476489 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred thirty-eight quarts is approximately one hundred fifty-nine point five gallons:

638 qt ≅ 159.5 gal

An alternative is also that one gallon is approximately zero point zero zero six times six hundred thirty-eight 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