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 638.5 quarts into gallons we have to multiply 638.5 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

638.5 qt → V_(gal)

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

V_(gal) = 638.5 qt × 0.25 gal

V_(gal) = 159.625 gal

The final result is:

638.5 qt → 159.625 gal

We conclude that 638.5 quarts is equivalent to 159.625 gallons:

638.5 quarts = 159.625 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.0062646828504307 × 638.5 quarts.

Another way is saying that 638.5 quarts is equal to 1 ÷ 0.0062646828504307 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 point five quarts is approximately one hundred fifty-nine point six two five gallons:

638.5 qt ≅ 159.625 gal

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