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The flat-pattern app for fabricators. Punch in your dimensions and FabCalc unfolds cones, frustums, cylinders, half-sleeves and ducts into a layout you can cut - with the swing radius, included angle, arc lengths and chords marked out for hand layout, and a 1:1 layered DXF (CUT / BEND / ROLL) that drops straight onto a plasma or laser table. Thickness + K-factor aware, so it's real sheet-metal development, not thin-cardboard math. Free on the App Store and Google Play.
Captured from production build · v1.0.0
Pick a shape - cone, cylinder, duct…
The product solves something specific and gets out of your way.
Unfold a cone or frustum (full 360°, half, or quarter wrap) into its gore - small/large radius, included angle, slant length, and arc lengths, all computed for you. Eccentric and oblique cones too.
Rectangular blanks for rolled cylinders and wraps, with developed circumference and seam allowance, plus square-to-round duct panels with bend lines.
Thickness + K-factor aware - true neutral-axis development with OD / ID / MEAN / neutral-axis diameter resolution. The bend allowance is right, so the part comes out to size, not 'close enough.'
Export a 1:1 DXF (R12) with CUT, BEND, ROLL and centerline on separate layers - drops straight onto a plasma, laser, or waterjet table. Free DXF export, no watermark.
Every pattern comes with the swing radius, included angle, arc lengths and chords grouped into Layout / Mark-out / Reference - everything you need to strike it on the bench with a trammel and a tape.
Save a pattern to recall later, and print a clean PDF job sheet with the drawing and the numbers for the guy at the table. No accounts, works offline.
Pick the fit. $4.99/mo to try, $29.99/yr for the best value, or $59.99 once - pay once, every future Pro feature included. No ads, no accounts, no tracking. Works the same in a shop with no Wi-Fi as the day you installed it.
Everything you’d want to know about FabCalc on a single sheet. No marketing math.
Same DNA - offline, no ads, no accounts, no tracking. Pro Unlock optional, three tiers.
Want a walkthrough of FabCalc? We do live demos, off-the-record. No salesperson on the call - the people who built it.
