Are the flange lengths inside or outside dimensions?
This calculator treats flange A and flange B as outside dimensions, then subtracts bend deduction to estimate flat length.
Sheet metal
Flat Pattern Length Calculator
Estimate a two-leg flat blank length from outside flange lengths and computed bend deduction.
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
Flat Pattern Length Calculator
Flat pattern length3.8942 in
Bend deduction used0.1058 in
FAQ
Specific checks for this calculator
Can I use this for multi-bend parts?
Use the same principle bend by bend, but multi-bend parts need bend order, tooling clearance, and accumulated tolerance checks.