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Unit Converter

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 18 cubic inches into gallons we have to multiply 18 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

18 in3 → V(gal)

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

V(gal) = 18 in3 × 0.0043290043290138 gal

V(gal) = 0.077922077922249 gal

The final result is:

18 in3 → 0.077922077922249 gal

We conclude that 18 cubic inches is equivalent to 0.077922077922249 gallons:

18 cubic inches = 0.077922077922249 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 12.833333333305 × 18 cubic inches.

Another way is saying that 18 cubic inches is equal to 1 ÷ 12.833333333305 gallons.

Approximate result

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

18 in3 ≅ 0.078 gal

An alternative is also that one gallon is approximately twelve point eight three three times eighteen 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

cubic inches (in3) gallons (gal)
19 cubic inches 0.082 gallons
20 cubic inches 0.087 gallons
21 cubic inches 0.091 gallons
22 cubic inches 0.095 gallons
23 cubic inches 0.1 gallons
24 cubic inches 0.104 gallons
25 cubic inches 0.108 gallons
26 cubic inches 0.113 gallons
27 cubic inches 0.117 gallons
28 cubic inches 0.121 gallons