Conversion formula

The conversion factor from cubic feet to gallons is 7.4805194805226, which means that 1 cubic foot is equal to 7.4805194805226 gallons:

1 ft3 = 7.4805194805226 gal

To convert 640.4 cubic feet into gallons we have to multiply 640.4 by the conversion factor in order to get the volume amount from cubic feet to gallons. We can also form a simple proportion to calculate the result:

1 ft3 → 7.4805194805226 gal

640.4 ft3 → V_(gal)

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

V_(gal) = 640.4 ft3 × 7.4805194805226 gal

V_(gal) = 4790.5246753267 gal

The final result is:

640.4 ft3 → 4790.5246753267 gal

We conclude that 640.4 cubic feet is equivalent to 4790.5246753267 gallons:

640.4 cubic feet = 4790.5246753267 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.00020874540217911 × 640.4 cubic feet.

Another way is saying that 640.4 cubic feet is equal to 1 ÷ 0.00020874540217911 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred forty point four cubic feet is approximately four thousand seven hundred ninety point five two five gallons:

640.4 ft3 ≅ 4790.525 gal

An alternative is also that one gallon is approximately zero times six hundred forty point four cubic feet.

Conversion table

cubic feet to gallons chart

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