Planichapa

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Online sheet metal pattern development calculator. Enter the dimensions and get the flat pattern of 50 parts: cones and reducers, segmented bends, pipe branches (saddles), square-to-round transitions, hoppers, screw flights and more. Every calculation is on the neutral axis, with a 3D preview, PDF templates at 1:1 and DXF export for plasma and laser cutting. Runs in any browser, nothing to install. Free plan: 20 calculations a month and four parts with no account. Full access: one-off 12-month purchase (GBP 69, EUR 69 or USD 79 by region).