Test the tool on a new drawing before using it on a critical, deadline-driven project.

There is no legitimate or standard AutoCAD file called "tlen.lsp" in official AutoCAD distributions. This filename is not part of Autodesk's official LISP routines. Searching for obscure .lsp files from untrusted sources poses significant security risks.

AutoCAD remains the industry standard for computer-aided design, but its default toolset can sometimes require repetitive, time-consuming clicks. If you are looking to automate your workflow, LISP routines are the ultimate solution.

TlenLSP is generally found on CAD customization forums, GitHub repositories, or technical blogs dedicated to AutoCAD tricks.

: Displays the calculated total length directly in the AutoCAD command window or an editable dialog box. Where to Download

Some popular LISP (T) files you might find useful:

The total length will appear in your command line or a pop-up alert.

Here is the critical warning: Be careful where you download LISP files.

When working on technical drawings in AutoCAD—estimating piping and cabling, calculating material quantities, checking fence lengths, or summarizing wall lengths—there is often a need to quickly calculate the total length of selected objects. Manually adding the lengths of each line or polyline one by one is tedious and error-prone. This is where tlen.lsp comes in.

Only download LISP files from reputable CAD communities. Keep a Backup: Always back up your custom LISP routines.