How to Calculate the Size of a Corner Shelf
A corner shelf is one that fits neatly into any square corner of a room. Whether you are designing and building your own corner shelf unit or you have a readymade shelf already occupying a corner of a room, you may wish to determine how much storage space a shelf or series of shelves will provide.
You can calculate the size of a corner shelf by using basic math formulas and adding the answers together.
Things You Will Need
 Tape measure
 Calculator

Measure the dimensions of the shelf  most corner shelves have one of two shapes: triangle or quarter circle. Measure the depth, the front edge and the side edges with the tape measure.

Calculate the area of a triangular shelf by dividing the front edge by 2 and multiplying it by the depth of the shelf (from the inner corner out to the front edge). For example, if the front edge is 20 inches and the depth of the shelf is 8 inches, calculate the following: 20 / 2 = 10; 10 * 8 = 80 inches. The surface area of the triangular shelf is 80 inches.

Calculate the area of a quartercircle shelf by multiplying the left or right straight edge of the shelf by itself. Multiply the answer by 3.14 and then divide the answer by 4. For example, if the straight edge is 8, calculate the following: 8 * 8 = 64; 64 * 3.14 = 200.96; 200.96 / 4 = 50.24 inches. The surface area of the quartercircle shelf is 50.24 inches.

Multiply the surface area for one shelf by the number of shelves. For example, if you have four triangular shelves, multiply 80 * 4 = 320 inches for the entire corner shelf unit. If you have three quartercircle shelves, multiply 50.24 * 3 = 150.72 inches for the entire corner shelf unit.
References
Writer Bio
Kathryn Hatter is a veteran homeschool educator, as well as an accomplished gardener, quilter, crocheter, cook, decorator and digital graphics creator. As a regular contributor to Natural News, many of Hatter's Internet publications focus on natural health and parenting. Hatter has also had publication on home improvement websites such as Redbeacon.
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 Hemera Technologies/PhotoObjects.net/Getty Images
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