Conversion formula

The conversion factor from cubic inches to gallons is 0.0043290043290138, which means that 1 cubic inch is equal to 0.0043290043290138 gallons:

1 in3 = 0.0043290043290138 gal

To convert 729 cubic inches into gallons we have to multiply 729 by the conversion factor in order to get the volume amount from cubic inches to gallons. We can also form a simple proportion to calculate the result:

1 in3 → 0.0043290043290138 gal

729 in3 → V_(gal)

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

V_(gal) = 729 in3 × 0.0043290043290138 gal

V_(gal) = 3.1558441558511 gal

The final result is:

729 in3 → 3.1558441558511 gal

We conclude that 729 cubic inches is equivalent to 3.1558441558511 gallons:

729 cubic inches = 3.1558441558511 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.31687242798284 × 729 cubic inches.

Another way is saying that 729 cubic inches is equal to 1 ÷ 0.31687242798284 gallons.

Approximate result

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

729 in3 ≅ 3.156 gal

An alternative is also that one gallon is approximately zero point three one seven times seven hundred twenty-nine cubic inches.

Conversion table

cubic inches to gallons chart

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