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 4221 cubic inches into gallons we have to multiply 4221 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

4221 in3 → V_(gal)

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

V_(gal) = 4221 in3 × 0.0043290043290138 gal

V_(gal) = 18.272727272767 gal

The final result is:

4221 in3 → 18.272727272767 gal

We conclude that 4221 cubic inches is equivalent to 18.272727272767 gallons:

4221 cubic inches = 18.272727272767 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.054726368159084 × 4221 cubic inches.

Another way is saying that 4221 cubic inches is equal to 1 ÷ 0.054726368159084 gallons.

Approximate result

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

4221 in3 ≅ 18.273 gal

An alternative is also that one gallon is approximately zero point zero five five times four thousand two hundred twenty-one 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