Total Area Autocad Lisp

Mastering Total Area Calculation in AutoCAD: The Ultimate Guide to LISP Routines

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(setq sq_meters total) (setq sq_feet (* total 10.7639)) (princ (strcat "\n>>> TOTAL: " (rtos sq_meters 2 2) " Sq. M. | " (rtos sq_feet 2 2) " Sq. Ft. <<<")) total area autocad lisp

1. Always Verify Units: Before trusting a LISP, draw a 10x10 square. Run your routine. If it says 100, you are in square units. If you need square meters but 1 unit = 1 mm, then your total is off by a factor of 1,000,000. Adjust your routine or use SCALE on your drawing.
2. Use Closed Polylines: Train yourself to use PEDIT → Close on any polyline boundary. Open polylines may still give an area (the area under the curve between start and end points), which is rarely what you want.
3. Avoid Overlaps: The routine sums everything. Overlapping areas (e.g., a room polyline inside a larger zone polyline) will double-count. Use a layer strategy: calculate total area by selecting only the outermost boundaries.
4. Save Your LISP in a Trusted Folder: Put all your custom LISP files in a folder like C:\CAD\LISPS\ and add that to AutoCAD's Support File Search Path under Options (Command OP).