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 20.4 cubic inches into gallons we have to multiply 20.4 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

20.4 in3 → V_(gal)

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

V_(gal) = 20.4 in3 × 0.0043290043290138 gal

V_(gal) = 0.088311688311882 gal

The final result is:

20.4 in3 → 0.088311688311882 gal

We conclude that 20.4 cubic inches is equivalent to 0.088311688311882 gallons:

20.4 cubic inches = 0.088311688311882 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 11.32352941174 × 20.4 cubic inches.

Another way is saying that 20.4 cubic inches is equal to 1 ÷ 11.32352941174 gallons.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty point four cubic inches is approximately zero point zero eight eight gallons:

20.4 in3 ≅ 0.088 gal

An alternative is also that one gallon is approximately eleven point three two four times twenty point four 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