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A “cubic measurement” is a threedimensional measurement of volume. If you have a cubic measurement in a different unit, you can easily convert it to cubic feet. You can also find the volume of common shapes, like rectangular prisms and cylinders, in a few simple steps. Whether you're completing a math problem or finding the volume of a space like a bedroom or post hole, the process is the same—just multiply the area of the base by the height. Also, note that cubic feet can be written as feet^{3}.
Steps
Method 1
Method 1 of 3:Converting to Cubic Feet
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1Divide by 1,728 to convert cubic inches to cubic feet. If you measured your shape or space in inches or were provided with units in inches, it's easy to convert them to feet. Keep in mind that inches are smaller units, so there will be fewer cubic feet than cubic inches. Simply take the volume in cubic inches and divide it by 1,728.^{[1] X Research source }
 For instance, if the volume is 6,912 cubic inches, divide 6,912 by 1,728, which is 4. So the volume is 4 cubic feet.

2Multiply by 27 to convert cubic yards to cubic feet. If you took your measurements in yards instead of feet, all you need to do is multiply the volume by 27. Remember that yards are larger units than feet, so you'll have more cubic feet than cubic yards.^{[2] X Research source }
 For instance, if the volume of your shape or space is 1,000 cubic yards, multiply 1,000 by 27, which equals 27,000 cubic feet.
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3Divide by 28,316.85 to convert cubic centimeters to cubic feet. Even though centimeters are metric units and feet are imperial units, you can still convert between the two. Centimeters are smaller units than feet, so you'll have more cubic centimeters than cubic feet. Start with the volume in cubic centimeters and divide it by 28,316.85.^{[3] X Research source }
 For example, if the volume of your shape or space is 500,000 cubic inches, divide 500,000 by 28,316.85. This is equal to 17.6573312356, which can be rounded to 17.66 cubic feet.

4Multiply by 35.31 to convert cubic meters to cubic feet. Converting between metric units and imperial units isn't as hard as you might think. To change your measurement from the larger cubic meters to the smaller units of cubic feet, multiply by 35.31.^{[4] X Research source }
 For example, if your space or shape has a volume measurement of 450 cubic meters, multiply 450 by 35.31 for a result of 15,889.50 cubic feet.
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Method 2
Method 2 of 3:Finding the Volume of a Rectangular Prism
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1Note that the formula for the volume of a rectangular prism is V=Bh. Both square shapes (cubes) and rectangular shapes are considered rectangular prisms. In this formula, V is the volume, B is the area of the base, and h is the height. Simply multiply the area of the base times the height to find the volume.^{[5] X Research source }
 Use the same units for each side of the prism. Ideally, measure in feet so the result is in cubic feet. Otherwise, you can convert the units once you find the volume.

2Find the area of the base by multiplying the length by the width. To find the area of a rectangle, you need to know the length (L) and the width (W). Measure each side or refer to the diagram if the numbers are provided for you. To find the area of the base of a rectangular prism, multiply the length by the width.^{[6] X Research source }
 For example, say the length of a room you're measuring is 10 feet and the width is 5 feet. Multiply 10 feet by 5 feet, which is 50 feet^{2}.
 The feet are squared because you are multiplying not just the numbers but the units as well.

3Multiply the area of the base by the height to find the volume. Now that you know the area of the base, measure the height or refer to the diagram if you have one. Multiply the area of the base by the height to finish the formula.^{[7] X Research source }
 For example, if the height of the room is 15 feet, multiply 15 by 50 feet^{2} (the area of the base of the room from the previous step). The total volume of the room is 750 feet^{3}.
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Method 3
Method 3 of 3:Calculating the Volume of a Cylinder
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1Use the formula V=Bh to find the volume of a cylinder. In this formula, V stands for volume, B stands for the area of the base, and h stands for the height. All you need to do is multiply the area of the base by the height to find the volume of the cylinder.^{[8] X Research source }
 Measure the space or shape in feet or convert all of the units to feet before beginning so your answer is in cubic feet. Otherwise, convert the units to cubic feet when you know the volume.

2Find the area of the base using the formula πr^{2}. Refer to the diagram to find the provided number for the radius (r), or measure it if you're working with a threedimensional shape or space. Since the base is a circle, find the area by squaring the radius and multiplying it by π, which is equal to 3.14.^{[9] X Research source }
 For instance, if you're digging a hole for a post and the radius of the post is 0.5 feet, multiply 0.5 by 0.5 to get 0.25 feet^{2}. Then, multiply 0.25 feet^{2} by 3.14, which is equal to 0.785 feet^{2}.
 Remember that the units for the radius are squared because you're multiplying them together the same way you multiply the numbers together.
 If you know the diameter of the circle instead of the radius, simply divide the diameter by 2 to get the radius. So, the radius of a circle with a diameter of 12 would be 6.

3Multiply the area of the base by the height to find the volume. Measure the height of the cylinder or refer to the diagram if the numbers are provided for you. Then, just multiply the height by the area of the base.^{[10] X Research source }
 For instance, take the area from the last step, which is 0.785 feet^{2}. If you need the hole for the post to be 2 feet deep, the height would be 2, so multiply 2 by 0.785 feet^{2} to get 1.57 feet^{3} which is the volume of the post hole.
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Community Q&A

QuestionHow many cubic feet are there in a cubic yard?DonaganTop Answerer27.

QuestionHow many cubic feet are in a hole 104 feet wide by 208 length by 14 feet tall?DonaganTop AnswererMultiply 104 x 208 x 14 to find the answer.

QuestionI can I find the cubic feet for a microwave over range measuring 30"W, 16"H, and 15"deep?DonaganTop AnswererThe easiest way to do this is to multiply 30 x 16 x 15 and then divide that product by 1728 (the number of cubic inches in a cubic foot).

QuestionHow many cubic feet of 68" diameter and 108" length of a wooden log?DonaganTop AnswererSquare the diameter and multiply by pi to get the crosssectional area of the log. Multiply that area by the length of the log. That gives you the volume in cubic inches. Divide by 1,728 to get the volume in cubic feet.

QuestionHow many cubic feet of gravel can I put in a 5000 square foot by 3 foot deep area?Community Answer5000ftsq x 3ft in height is approximately 15000 cubic feet of gravel depending on exact interior volume.

QuestionHow can I find the cubic feet of plank of 6 inches breadth, 6 foot long, and 1 inch thick?DonaganTop AnswererConvert 6 inches to 1/2 foot and 1 inch to 1/12 foot. Then multiply 6 x 1/2 x 1/12.

QuestionWhat's the best way to measure cubic feet for something that's oddly shaped?DonaganTop AnswererWater displacement is by far the easiest method. Otherwise, you'll have to break the object into various segments mentally and calculate each of their volumes.

QuestionHow do I get the cubic feet of a microwave?DonaganTop AnswererMeasure the inside dimensions of the microwave, and multiply them together.

QuestionThe formula is all wrong. How do you get 128^2 from 8x16? And how does 128^2 x 27 = 3456^3? It doesn't!Community AnswerThe formula is right, but the notations used in the illustrations are confusing. By 128^2 they don't mean 128 x 128, they mean 128 square inches. They should have written 128 in^2.

QuestionWhat size yard will 25 cubic feet of mulch cover?DonaganTop AnswererIt depends on how deep the mulch is. For example, if it's spread two inches deep, it would cover 150 square feet (or a 15' by 10' rectangular area). If it's spread one inch deep, it would cover twice that much.
Tips
References
 ↑ https://www.thecalculatorsite.com/misc/cubicfeetcalculator.php
 ↑ https://www.thecalculatorsite.com/misc/cubicfeetcalculator.php
 ↑ https://www.thecalculatorsite.com/misc/cubicfeetcalculator.php
 ↑ https://www.thecalculatorsite.com/articles/units/howtocalculatecubicfeet.php
 ↑ http://virtualnerd.com/prealgebra/perimeterareavolume/volume/volumeexamples/rectangularprismvolumeexample
 ↑ https://www.mathplanet.com/education/prealgebra/inequalitiesandonestepequations/calculatingtheareaandtheperimeter
 ↑ http://virtualnerd.com/prealgebra/perimeterareavolume/volume/volumeexamples/rectangularprismvolumeexample
 ↑ https://virtualnerd.com/geometry/surfaceareavolumesolid/prismscylindersvolume/cylindervolumeexample
 ↑ https://www.mathsisfun.com/geometry/circlearea.html
About This Article
To find the cubic feet of a square or rectangular shape, measure the length, width and height of the object in feet or inches. Once you have these three numbers, multiply them together to get the volume. If you measured in inches, divide your answer by 1728 to convert the measurement to feet. For example, if you have a rectangular shape measuring 8 inches by 16 inches by 27 inches, the volume would be 3456 inches cubed. You could then divide by 1728 to get your answer of 2 cubic feet. To learn how to find cubic feet of a cylinder or pyramid, keep reading the article!