Keep in mind that some metals are more brittle than others.As an example, if you want to bend 24 gauge sheet metal at a 90° angle, the calculation would be: 0.017453 x 90 x (0.020 + 0.33 x 0.024) = 0.0438558984 inch bend allowance.To ascertain your K-Factor, inside radius, and material thickness (expressed as a decimal), you should use an Bend Allowance Chart.X Research source X Research source X Research source You can find your bend allowance with the following formula: (π/180) x B x (IR + K x MT) = bend allowance (BA), where B is the angle complementary to your desired bend angle (1 to 180 degrees), MT is the thickness of the material, IR is the inside radius, and K is the K-factor. To calculate the expansion that will take place on the outside of your bend angle, you will need to know your bend allowance. The bending you will be doing will warp your sheet metal so that it is physically bigger.
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