Conversion formula

The conversion factor from cups to cubic feet is 0.0083550347222188, which means that 1 cup is equal to 0.0083550347222188 cubic feet:

1 cup = 0.0083550347222188 ft3

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

1 cup → 0.0083550347222188 ft3

21 cup → V_(ft3)

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

V_(ft3) = 21 cup × 0.0083550347222188 ft3

V_(ft3) = 0.17545572916659 ft3

The final result is:

21 cup → 0.17545572916659 ft3

We conclude that 21 cups is equivalent to 0.17545572916659 cubic feet:

21 cups = 0.17545572916659 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 5.6994434137315 × 21 cups.

Another way is saying that 21 cups is equal to 1 ÷ 5.6994434137315 cubic feet.

Approximate result

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

21 cup ≅ 0.175 ft3

An alternative is also that one cubic foot is approximately five point six nine nine times twenty-one cups.

Conversion table

cups to cubic feet chart

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