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 688.5 cubic feet into gallons we have to multiply 688.5 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

688.5 ft3 → V_(gal)

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

V_(gal) = 688.5 ft3 × 7.4805194805226 gal

V_(gal) = 5150.3376623398 gal

The final result is:

688.5 ft3 → 5150.3376623398 gal

We conclude that 688.5 cubic feet is equivalent to 5150.3376623398 gallons:

688.5 cubic feet = 5150.3376623398 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.00019416202695062 × 688.5 cubic feet.

Another way is saying that 688.5 cubic feet is equal to 1 ÷ 0.00019416202695062 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that six hundred eighty-eight point five cubic feet is approximately five thousand one hundred fifty point three three eight gallons:

688.5 ft3 ≅ 5150.338 gal

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