Cubic measurements take all three dimensions into consideration – width, length and height. This will tell you the volume of a given area and is useful for such things as knowing how much air is in a room when sizing an exhaust fan or the volume of a foundation form when ordering concrete.
Volume of a room: To calculate the number of cubic feet in the room used in the examples above, multiply the width by the length by the height: (10′ x 12′ x 8′ = 960 cubic feet).
Volume in cubic feet: There are 27 cubic feet in a cubic yard. So, if you would like to convert cubic feet into cubic yards, which is used for such things as dirt, gravel and concrete, just divide the number of cubic feet by 27 to arrive at the number of cubic yards. For example, if you have a form that is 2′ wide, 10′ long, and 1 1/2′ high, first figure the cubic feet, then convert to cubic yards: (2′ x 10′ x 1.5′ = 30 cubic feet / 27 = 1.11 cubic yards).
Volume in cubic inches: There are 1,728 cubic inches in a cubic foot. To convert the cubic feet in the above example into cubic inches, you would multiply by 1,728 (30 cubic feet x 1,728 = 51,840 cubic inches).