What measured value do I need for reverse K-factor?
You need the measured bend allowance or a flat-pattern result that lets you isolate bend allowance for the bend being solved.
Sheet metal
Reverse K-Factor Solver
Back-solve K-factor from measured bend allowance, bend angle, inside radius, and material thickness.
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
Reverse K-Factor Solver
Solved K-factor0.420
Measured bend allowance0.1334 in
FAQ
Specific checks for this calculator
Should I solve K-factor from one test coupon?
One coupon is a useful start, but production K-factor should be confirmed across the thickness, radius, grain direction, and tooling range you plan to run.