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Bend allowance calculator with K-factor, bend deduction and flat pattern length
A sheet metal calculator for the flat pattern of a bent part. Enter thickness, inside radius, bend angle and K factor, and get bend allowance, bend deduction, outside setback and the flat length before you cut — with a profile diagram that shows exactly which dimensions you entered. Built for sheet metal shops, HVAC duct fabricators and anyone who runs a press brake and is tired of redoing the math on scrap paper. Key Features - Bend allowance calculator: BA = θ × (R + K × T), with outside setback and bend deduction shown next to it. - Single bend, L, U and Z profiles: enter outside flange dimensions and get the flat length with every bend deduction applied. - Outside dimensions made clear: the diagram labels each flange as an outside (outer mold line) dimension, so inside and outside measurements don't get mixed up. - Bend direction on the drawing: U channels bend the same way twice, Z profiles bend up then down — both show on the profile and on the flat pattern. - Flat pattern with bend lines: see where each bend line falls from the left edge of the blank for layout. - K-factor starting values: pick aluminum, mild steel or stainless and a starting K is filled in from the R/T ratio. Enter your own K when you have tested it. - Cut length rounded up: the exact flat length and a rounded-up cut length (0.5 mm or 1/32 in) are shown separately. - Project parts list: add parts with quantities, duplicate or delete them, and copy the whole list with the inputs behind each line. - mm or inches: switch units at any time; comma decimals work too. - Recent projects: save up to 20 projects on the device and reopen one as a new job. Recommended For - Press brake operators checking a blank size before cutting - HVAC and duct fabricators laying out brackets, channels and Z flashing - Students learning bend allowance and bend deduction The K-factor table gives starting values only, and springback is not included. Results are planning values — make a test bend before cutting production parts. The app does not export DXF or PDF and does not calculate press brake tonnage.