first, you must have the length, width, and height of the object in feet. Than all you have to do is multiply them together to get cubic feet.
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Volume in cubic feet = Length in feet * Width in feet * Height in feet.
Multiply length by width by height to find the volume in a cubic unit of measurement. For example, to find the volume of a box that is 2 feet long, 2 feet wide and 3 feet high, 2x2x3=12 cubic feet.
Cubic feet is one unit of measurement of volume, though any cubic unit of measurement (cubic centimeters, cubic yards, ect.) is representative of a volume.
The volume in cubic feet of a cube 3' by 3' by 3' is: 27 cubic feet.
There is no such unit as "cubic square feet". If you want to calculate the cubic feet of volume in a room, multiply the room's length (in feet) by its width (in feet), and then multiply that result by the room's height (in feet).