Conversion formula

The conversion factor from gallons to cubic meters is 0.0037854118, which means that 1 gallon is equal to 0.0037854118 cubic meters:

1 gal = 0.0037854118 m3

To convert 21 gallons into cubic meters we have to multiply 21 by the conversion factor in order to get the volume amount from gallons to cubic meters. We can also form a simple proportion to calculate the result:

1 gal → 0.0037854118 m3

21 gal → V_(m3)

Solve the above proportion to obtain the volume V in cubic meters:

V_(m3) = 21 gal × 0.0037854118 m3

V_(m3) = 0.0794936478 m3

The final result is:

21 gal → 0.0794936478 m3

We conclude that 21 gallons is equivalent to 0.0794936478 cubic meters:

21 gallons = 0.0794936478 cubic meters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cubic meter is equal to 12.579621487693 × 21 gallons.

Another way is saying that 21 gallons is equal to 1 ÷ 12.579621487693 cubic meters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that twenty-one gallons is approximately zero point zero seven nine cubic meters:

21 gal ≅ 0.079 m3

An alternative is also that one cubic meter is approximately twelve point five eight times twenty-one gallons.

Conversion table

gallons to cubic meters chart

For quick reference purposes, below is the conversion table you can use to convert from gallons to cubic meters