When should I use bend deduction instead of bend allowance?
Use bend deduction when your part dimensions are outside flange dimensions and the flat length is calculated by subtracting deduction from the flange sum.
Sheet metal
Bend Deduction Calculator
Calculate bend deduction from outside setbacks and bend allowance for two-flange flat layouts.
mild steel16 ga0.0598 in1.519 mm
Static reference
Common thickness, radius, and angle combinations
| Gauge | Thickness | Inside radius | Angle | Bend allowance | Bend deduction |
|---|---|---|---|---|---|
| 16 ga | 0.0598 in / 1.519 mm | 0.0598 in / 1.519 mm | 45 deg | 0.0667 in | 0.0324 in |
| 12 ga | 0.1046 in / 2.657 mm | 0.1569 in / 3.985 mm | 90 deg | 0.3155 in | 0.2075 in |
Interactive calculator
Bend Deduction Calculator
Bend deduction0.1058 in
Bend allowance0.1334 in
FAQ
Specific checks for this calculator
Does bend deduction work for any angle?
The calculator supports common bends below 180 degrees, but acute tooling, hemming, and special forming operations need process-specific data.