you multiply the length times width times height.
The formula will depend on what it is that you are trying to find: the volume or the surface area.
Multiply length x width.
To calculate the area of the front surface of a box, you would multiply the width of the box by the height of the box. This calculation gives you the area of the rectangular front surface.
A rectangular box has six sides. Find the area of them and add them together. Two sides are length times height, two sides are length times width, and two sides are width times height. Surface Area = 2LH + 2LW + 2WH
2 x ((L x W) + (L x H) + (H x W))
The good thing about the developments of rectangular boxes is that they are still rectangular! In order to find the surface area of the paper needed to make a box, you would first need to determine the measurements of your finished box. One you have determined your length (L), width (W), and height (H), you will need to do some simple math. 2(LxW) + 2(WxH) + 2(LxH) = the area of paper that you need to make a box.
With the developments of rectangular box on paper how am I supposed to find the area of the paper that I need to make the box -- Not find the air of the box itself but the paper used? By measuring the area of one side of the box and multiplying by the six sides. You get the total area of the box (Cube).
The answer will depend on the shape (and size) of the box: some have a rectangular cross-section, others circular.
measure the sides of the box
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It should be relatively easy to find the surface area of a box when you are given the surface area.
4 feet