Autodesk’s own forums and communities like CADTutor and CAD Forum frequently attach working .LSP files to discussion threads. For example, a well‑known version of tlen.lsp that works on both Windows and macOS has been shared in Autodesk’s “Total Length in MacOS” thread. These files have been tested by hundreds of users and are generally safe.
Download the routine today, follow the simple loading steps, and start experiencing a more productive drafting process.
For safety, only download source code from trusted community sources or official-looking repository gists. Now, after acquiring the file, the next step is to load it into AutoCAD.
If you want to troubleshoot a specific issue with your script, let me know: What are you using? What error message appears on your command line?
Change tl to (/ tl 1000) for meters if your drawing units are millimeters, for example. Save the file and reload it. autocad tlenlsp download work
The result is also copied to the clipboard in many versions, allowing you to paste it directly into a spreadsheet, a report, or a text note.
If you want the command to work every time you open AutoCAD without having to reload it manually, click the button under the "Startup Suite" icon (represented by a briefcase). Click Add , select your Tlen.lsp file, and close the window. Step 4: Run the Command
AutoCAD's modern security settings restrict unauthorized scripts.
Select all the lines, polylines, and arcs you want to measure. You can use window selection or click items individually. Press Enter. Step 4: Viewing the Results Autodesk’s own forums and communities like CADTutor and
: Full AutoCAD versions, BricsCAD, and AutoCAD LT (version 2024 or newer).
Struggling with the tlen.lsp command in AutoCAD? Learn where to safely download it, how to load it properly, and how to get the Total Length of multiple lines, polylines, and arcs to work instantly.
Press . The script will parse the digits and output the mathematical total. 3. Automatic Sequential Labeling ( TNUM ) To place sequential numbers across your drawing rapidly: Type TNUM into the command bar and hit Enter .
When you run TLEN and select a set of objects, the script sums their lengths and displays the result in an alert box. This simple but effective function is a massive time-saver for tasks like generating material quantities (e.g., total length of piping or wiring), estimating infrastructure projects, or quickly checking design dimensions. Download the routine today, follow the simple loading
You type TLEN at the command line, but instead of getting the total length prompt, AutoCAD starts the native LENGTHEN (often abbreviated LEN ) command.
This is widely considered the gold standard for this task. Authored by renowned LISP developer Lee Mac, these programs are more reliable and support a far wider range of objects than the original TLEN. It's also extremely customizable and still being updated.
Once the TLEN.LSP routine is loaded, using it is straightforward:
While you can see individual lengths, selecting multiple mismatched items leaves the "Length" field blank or unhelpful. To solve this, CAD drafters, engineers, and estimators worldwide rely on TLEN.lsp , a powerful, lightweight, and completely free AutoLISP routine. It automatically aggregates the measurements of all selected entities into a single, cohesive metric. What is TLEN.lsp?
By default, loading a LISP file using the basic APPLOAD tool only keeps it active for the current drawing session. If you close AutoCAD and reopen it tomorrow, the TLEN command will result in an "Unknown Command" error.