Bend deduction and Flat length vs Bend Allowance Calculator

One of the most common problems in bending is the calculation of bend deduction. Determining the size of the piece to be cut starting from the finished measurements is often done by trial and error, requiring a lot of additional work not only for the press brake operator but also for the designer and the laser cutter operator. Time and material are wasted on various tests before getting a reliable value. With this app, you quickly get the sheet metal bend deduction, and therefore the sheet metal blank initial flat length, from the finished part measurements. You only have to insert interior angle, flange lengths, K factor, inside radius, and material thickness.

Setting up a press brake job and need the bend allowance, deduction, or flat blank length before you cut? Getting it wrong wastes material and time. This calculator computes BA, OSSB, BD, and flat blank from your K-factor, material thickness, bend radius, and angle. Enter material thickness, inside bend radius, bend angle, and K-factor (or use presets for mild steel, aluminum, stainless). Get bend allowance, bend deduction, outside setback, and total flat blank length. WHAT IT CALCULATES: - Bend Allowance (BA) - Bend Deduction (BD) - Outside Setback (OSSB) - Flat blank length for single and multi-bend parts - Arc length of the neutral axis K-FACTOR PRESETS: - Air bend, bottom bend, coining - Mild steel, aluminum, stainless steel - Custom K-factor entry KEY FEATURES: - Multi-bend flat pattern layout - Standard K-factor presets - Metric and imperial units - Works completely offline - No account or login required Built for sheet metal fabricators, press brake operators, and mechanical engineers.