A cubic foot is a measurement that encompasses a shape that is 1 foot wide, 1 foot tall and 1 foot long. To find a cubic feet volume measurement, you multiply the height, length and width of an object that's in the form of a rectangular prism. If you want to find the volume to the nearest cubic foot, you'll have to perform a bit of rounding to arrive at a whole number once you find your volume measurement
Find the volume of your object in cubic feet. Stretch a tape measure across your object and find the length, width and height in feet. Multiply all these numbers together to find the volume. For example, measurements of 3 feet by 2.2 feet by 6 feet produce a volume of 39.6 cubic feet.
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Round your volume measurement up to the nearest whole number if the number to the right of the decimal point is 5 or higher. For example, in 39.6 cubic feet, the decimal number of 6 causes the entire number to be rounded to 40 cubic feet.
Round your volume measurement down to the nearest whole number if the number to the right of the decimal point is 4 or lower. For example, if your volume measurement was 39.4 cubic feet, the 4 would require you to round the whole number down to 39 cubic feet.