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• Cone, cylinder and elbow development is now part of Pro. The drawing stays free to try; bending calculations stay free. • Free users see a small banner on the home screen and, now and then, a full-screen ad before a pattern opens. Pro removes both. • The yearly plan shows its monthly price, and a purchase that does not go through now says why.
Sheet metal flat pattern calculator: bend allowance, K-factor, DXF, 1:1 PDF
Unbend turns sheet metal dimensions into a cut ready flat pattern. Enter the shape, the thickness, the angle and the inside radius, and you get the blank length, the bend allowance, the bend deduction and a drawn pattern you can export to your cutter or print at true size. Made for fabricators, ducting and HVAC shops, welders, coachbuilders and anyone who has to mark out metal before it goes to the brake or the plasma table. SHAPES Single bend at any angle Multi bend profile, chained folds in one blank U channel with two parallel legs Z profile, offset step with opposite folds Hem, an edge folded back on itself Joggle, a small offset for a lap joint Cone Truncated cone Cylinder and straight round duct Truncated cylinder, cut at an angle Segmented elbow, a gored bend developed from flat gores BEND MATH THAT MATCHES THE PRESS Bend allowance and bend deduction from published K-factor charts K-factor resolved from the material, the thickness and the inside radius Air bending, bottoming and coining Mild steel, galvanized steel, stainless steel, aluminum and copper Your own K-factor per material when you want the numbers to match your own tooling FLAT PATTERN AND ORDINATES Every pattern is drawn to scale, solid lines for cuts and dashed lines for bends Station lines on rolled and curved developments Ordinate table with X across and Y up from the bottom left corner of the pattern, so a pattern can be marked out with nothing but a tape measure Pinch to zoom and fit to screen on the pattern view EXPORT DXF for CNC, plasma and laser cutting PDF at 1:1 scale, print it, lay it on the sheet and mark straight through PDF tiled across A4 or Letter with alignment marks, for patterns larger than one page A calibration ruler on the first printed page, so you can prove the template came out true to size Ordinates as CSV for a spreadsheet Share the pattern as an image UNITS Millimeters or inches, switched in one tap Inch fractions at the precision you actually work in Results, ordinates and printed templates all follow the unit you chose BUILT FOR THE SHOP FLOOR Everything is calculated on the device, so it works in a workshop with no signal No account and no sign in Save a job and reopen it later with every dimension still in place Light and dark theme Available in 15 languages UNBEND PRO One payment. There is no subscription and nothing renews. Pro adds DXF export, 1:1 and tiled PDF templates, unlimited saved jobs and your own K-factor table. The unlock stays with your Google account, so it follows you to a new phone. The free version calculates every shape, draws every flat pattern, shows the ordinate table and lets you save jobs. Unbend does not replace your CAD seat. It is the tool for the moment you are standing at the bench with a tape measure and a piece of sheet, and you need the flat size before you cut.