How to Calculate Cubed Feet
Consider determining the cubed feet of a room or storage container to know how much empty space it contains. In addition, the cubed feet of an object reveals how much space it occupies. The calculation of cubed feet results from finding volume. The volume of a space or object is related to its physical dimensions. Knowing the volume of a room, or storage pod gives you an idea of how much furniture will fit in the space. The volume of a cylindrical container, perhaps for water storage, may also be found.
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Instructions
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Rectangular Space or Object
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Measure the length, width and height of the space in inches. For example, you might have a room with a length of 102.0 inches, a width of 74.5 inches and a height of 84.0 inches.
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Convert the length, width and height to feet by dividing by 12, since a foot contains 12 inches. Performing this step leads to a length of 8.5 feet, a width of 6.2 feet and a height of 7.0 feet.
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Multiply the length times the width times the height to obtain the volume in cubed feet. Completing the exercise yields 8.5 feet times 6.2 feet times 7.0 feet, or a volume of 368.9 cubed feet.
Cylindrical Space or Object
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Measure the height of the cylinder in inches. Measure along the curved portion of the cylinder from one flat end to the other. For example, you might have a water tank of height 65.0 inches.
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Measure the circumference of the cylinder in inches. The circumference measures the distance around the curved portion of the cylinder. For example, the circumference could be 38.0 inches.
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Change the height and circumference measurements to feet by dividing by 12. Performing this step, you have a height of 5.4 feet and a circumference of 3.2 feet.
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Divide the circumference by 2 times the number pi, to get the radius in feet. Radius measures the distance from the center of the circular end of the cylinder to its edge. Using 3.14 for pi, 2 times pi equals 6.28. Then 3.2 feet divided by 6.28 equals a radius of 0.5 feet.
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Multiply the number pi times the height times the square of the radius to arrive at the volume of the cylinder in cubed feet. Performing this step gives 3.14 times 5.4 feet times 0.5 feet times 0.5 feet, or a volume of 4.2 cubed feet.
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