Sheet Metal Bending Calculator

Calculate bend allowance, bend deduction, K-factor, and developed (flat) length for sheet metal fabrication.

Sheet metal thickness.
mm
Radius of the inside of the bend.
mm
Included bend angle.
degrees
Neutral axis position. Soft: 0.33, Medium: 0.41, Hard: 0.50.
First flange measured to bend intersection.
mm
Second flange measured to bend intersection.
mm

Results

Bend Allowance-mm
Bend Deduction-mm
Developed (Flat) Length-mm
Outside Setback-mm
References: Machinery's Handbook — Sheet Metal; ASME Y14.5