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A cubic inch is a measure of volume that is equal to that of a cube measuring 1 inch (2.5 cm) on each side. An object's volume in cubic inches is, thus, the same as that of a certain number of these hypothetical cubes. There are a number of ways to calculate an object's volume in cubic inches, but in the simplest cases, as with 3dimensional rectangular prisms (boxes), the volume is simply length × width × depth when all measurements are in inches.
Steps
Cubic Inches Calculator
Method 1
Method 1 of 2:Calculating the Volume of a Box in Cubic Inches

1Measure the length, width, and depth of an object in inches. To calculate the volume of a rectangular space, all you need to know are the values of its dimensions in inches. You may need to physically measure the object or to convert to inches from a different set of units.^{[1] X Research source }
 For example, if we wanted to find the volume of a refrigerator, we would find its length, width, and depth in inches. Let's say our fridge is 50 inches (127.0 cm) long, 25 inches (63.5 cm) wide, and 20 inches (50.8 cm) deep.

2Write the length of your object. The first step in calculating a volume with this process is to write one of your dimensions down. You can multiply these dimensions in any order  for our purposes, let's write the length first.
 In our example, we would write 50 first, as our fridge is 50 inches (127.0 cm) long.
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3Multiply the length by the width of your object. Next, multiply your first dimension by one of the others. Again, you can multiply your dimensions in any order, but, for our purposes, let's multiply the length by the width.^{[2] X Research source }
 In our example, we would multiply 50 × 25  the width. 50 × 25 = 1250.

4Multiply your answer by the depth of your object. Finally, multiply the answer you got by multiplying two of your object's dimensions by the remaining dimension. In our case, this means multiplying the product of our object's length and width by its depth.
 In our example, we would multiply 1250 × 20  the depth. 1250 × 20 = 25,000.

5Label your answer in cubic inches. You may know that your final answer refers to a volume in cubic inches, but another person may not. Be sure to use a proper label for your answer that specifies that the volume is in cubic inches.
 Acceptable labels include:
 "Cubic Inches"
 "Inches Cubed"
 "Cu. In."
 "In^{3}"
Advertisement  Acceptable labels include:
Method 2
Method 2 of 2:Calculating the Volumes of Other Shapes

1Calculate the volume of a cube with L^{3}. Cubes are rectangular prisms (boxes) in which every side length and angle is equal.^{[3] X Research source } Thus, the volume of a cube can be written as length × width × depth = length × length × length = length^{3}. To get your answer in cubic inches, ensure your length measurement is in inches.

2Calculate the volume of a cylinder with v = hπr^{2}. Cylinders are smoothsided objects with two circular faces of equal size. The formula v = hπr^{2} where v = volume, h = height, and r = the cylinder's radius (the distance from the center of either of the circular faces to its edge) gives the volume of a cylinder.^{[4] X Research source } Make sure your measurements for h and r are in inches.

3Calculate the volume of a cone with v = (1/3)hπr^{2}. Cones are smoothsided objects with a circular base that tapers to a point. The formula v = hπr^{2}/3 where v = volume, h = height, and r = the radius of the circular base gives the volume of a cone.^{[5] X Research source } As above, ensure your measurements for h and r are in inches.

4Calculate the volume of a sphere with v = 4/3πr^{3}. Spheres are perfectly round 3d objects. The equation v = 4/3πr^{3} where v = volume and r = the radius of the sphere (the distance from its center to its edge) gives the volume of a sphere.^{[6] X Research source } As before, make sure your measurement for r is in inches.Advertisement
Community Q&A

QuestionWhat would 200 cubic inches equal in a box: Length, width and depth?Community AnswerThe length x width x depth = the total cubic inches. Unless the object you are working with is a perfect cube (all sides are equal,) there is no way to tell with the length, width and depth are. If you are working with a perfect cube just take the square root of 200, then the square root of that (taking 2 square roots will undo the cube and give you the measurements.) In this case, each side will be just under 6 inches (6x6x6), more accurately 5.84 inches.

QuestionHow do I write km in volume?DonaganTop AnswererYou could express a volume in cubic kilometers (km³).

QuestionHow do I convert square inches into cubic inches?DonaganTop AnswererIf you have one side of a volume that's measured in square inches, you could multiply by a third dimension in inches to arrive at a volume in cubic inches.

Question1755 cubit inches equals how much cubit feet?DonaganTop AnswererThere are 1,728 cubic inches in one cubic foot.

QuestionHow do I convert cubic inches to cubic feet?DonaganTop AnswererDivide the cubic inches by 1728.

QuestionHow can I convert cubic inches to cubic feet?DonaganTop AnswererDivide cubic inches by 1,728.

QuestionWhat would be cubic measurement of an item measuring 34 inches, by 15 inches, by 15 inches?Community AnswerThe best way to truly understand how this works, is to first start in 2 dimensions. We'll take the 15 by 15 side first. A square inch is the area of a square with 1 inch sides. So when you have 15 inch sides, you simply multiply them together and get 225 square inches. Cubic inches are the same concept, except in 3 dimensions. A cubic inch is a 1x1x1 inch box. if you take the 15x15 inch grid, made up of 225 square inches and raise them by 1 inch, you'll end up with 225 cubic inches (a 15x15x1 inch box) To calculate the cubic inches in a 34 by 15 by 15 inch box simply multiply the numbers together. 34x15x15 = 7650. If it helps, think of "by" being a stand in for "x", the multiplication symbol.

QuestionHow does one find the cubic area in yards when one is calculating in inches: 180 x 120 x 6?DonaganTop AnswererMultiply the three numbers to get the volume in cubic inches. Then divide by 46,656 to get the volume in cubic yards.

QuestionIf a newborn is 22 1/4 inches long, how many centimeters should the nurse document on the charts?DonaganTop AnswererOne inch = 2.54 cm. 22¼ inches = (22.25)(2.54) = 56.515 = 56½ cm.

Question19 1/4" width, 10 5/8" height, 13 1/4" diameter equals how many cubic inches?DonaganTop AnswererFirst convert all three mixed numbers to improper fractions, then multiply them together: (19¼)(10 5/8)(13¼) = (77/4)(85/8)(53/4) = 346,885 / 128 = 2,710.04 cubic inches.
Tips
 If you know (and are wiling to admit) your math isn't that great, check your answer using a calculator or another person. Just make sure you get a person who knows what they're doing and that you push the right buttons.Thanks!
 Cubic inches measure volume, how much "stuff" fits inside something.Thanks!
 Make sure to use a ruler or tape measure for measuring accuracy, especially if you're doing something important, like engineering something.Thanks!
References
 ↑ https://www.mathsisfun.com/cuboid.html
 ↑ https://www.mathsisfun.com/cuboid.html
 ↑ https://www.mathsisfun.com/geometry/cuboidsrectangularprisms.html
 ↑ https://www.mathsisfun.com/geometry/cylinder.html#Volume
 ↑ https://www.mathsisfun.com/geometry/cone.html
 ↑ https://www.mathsisfun.com/geometry/sphere.html
About This Article
To calculate cubic inches, start by measuring the length, width, and depth of the box you're measuring in inches. Then, multiply the length by the width. Finally, multiply the product of the length and the width by the depth of the box to find the volume in cubic inches. If you want to find the volume of a cylinder in cubic inches, use the formula v = hπr^2, where h is the height of the cylinder and r is the radius of the base. If you want to learn how to calculate the volume of other shapes in cubic inches, keep reading!