Conversion formula

The conversion factor from gallons to cubic inches is 230.99999999949, which means that 1 gallon is equal to 230.99999999949 cubic inches:

1 gal = 230.99999999949 in3

To convert 721 gallons into cubic inches we have to multiply 721 by the conversion factor in order to get the volume amount from gallons to cubic inches. We can also form a simple proportion to calculate the result:

1 gal → 230.99999999949 in3

721 gal → V_(in3)

Solve the above proportion to obtain the volume V in cubic inches:

V_(in3) = 721 gal × 230.99999999949 in3

V_(in3) = 166550.99999963 in3

The final result is:

721 gal → 166550.99999963 in3

We conclude that 721 gallons is equivalent to 166550.99999963 cubic inches:

721 gallons = 166550.99999963 cubic inches

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cubic inch is equal to 6.0041668918361E-6 × 721 gallons.

Another way is saying that 721 gallons is equal to 1 ÷ 6.0041668918361E-6 cubic inches.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that seven hundred twenty-one gallons is approximately one hundred sixty-six thousand five hundred fifty-one cubic inches:

721 gal ≅ 166551 in3

An alternative is also that one cubic inch is approximately zero times seven hundred twenty-one gallons.

Conversion table

gallons to cubic inches chart

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