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 421 cubic inches into gallons we have to multiply 421 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

421 in3 → V_(gal)

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

V_(gal) = 421 in3 × 0.0043290043290138 gal

V_(gal) = 1.8225108225148 gal

The final result is:

421 in3 → 1.8225108225148 gal

We conclude that 421 cubic inches is equivalent to 1.8225108225148 gallons:

421 cubic inches = 1.8225108225148 gallons

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 gallon is equal to 0.54869358669713 × 421 cubic inches.

Another way is saying that 421 cubic inches is equal to 1 ÷ 0.54869358669713 gallons.

Approximate result

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

421 in3 ≅ 1.823 gal

An alternative is also that one gallon is approximately zero point five four nine times four 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