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 309 cubic inches into gallons we have to multiply 309 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

309 in3 → V_(gal)

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

V_(gal) = 309 in3 × 0.0043290043290138 gal

V_(gal) = 1.3376623376653 gal

The final result is:

309 in3 → 1.3376623376653 gal

We conclude that 309 cubic inches is equivalent to 1.3376623376653 gallons:

309 cubic inches = 1.3376623376653 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.74757281553234 × 309 cubic inches.

Another way is saying that 309 cubic inches is equal to 1 ÷ 0.74757281553234 gallons.

Approximate result

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

309 in3 ≅ 1.338 gal

An alternative is also that one gallon is approximately zero point seven four eight times three hundred 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