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Unit Converter

Conversion formula

The conversion factor from gallons to cubic feet is 0.1336805555555, which means that 1 gallon is equal to 0.1336805555555 cubic feet:

1 gal = 0.1336805555555 ft3

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

1 gal → 0.1336805555555 ft3

21 gal → V(ft3)

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

V(ft3) = 21 gal × 0.1336805555555 ft3

V(ft3) = 2.8072916666655 ft3

The final result is:

21 gal → 2.8072916666655 ft3

We conclude that 21 gallons is equivalent to 2.8072916666655 cubic feet:

21 gallons = 2.8072916666655 cubic feet

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 cubic foot is equal to 0.35621521335822 × 21 gallons.

Another way is saying that 21 gallons is equal to 1 ÷ 0.35621521335822 cubic feet.

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 two point eight zero seven cubic feet:

21 gal ≅ 2.807 ft3

An alternative is also that one cubic foot is approximately zero point three five six times twenty-one gallons.

Conversion table

gallons to cubic feet chart

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

gallons (gal) cubic feet (ft3)
22 gallons 2.941 cubic feet
23 gallons 3.075 cubic feet
24 gallons 3.208 cubic feet
25 gallons 3.342 cubic feet
26 gallons 3.476 cubic feet
27 gallons 3.609 cubic feet
28 gallons 3.743 cubic feet
29 gallons 3.877 cubic feet
30 gallons 4.01 cubic feet
31 gallons 4.144 cubic feet