If you prefer a professionally maintained version, some developers offer enhanced TLEN scripts (sometimes named tlen.lsp or linelengths.lsp ) with additional features like export to CSV or better handling of blocks. These are available on marketplaces such as TapWorks BOOTH. While the original TLEN is free, paid versions may include support and regular updates.

In the world of CAD design, estimating quantities, lengths, and perimeters is a frequent, time-consuming task. Whether you are an electrical engineer calculating total conduit length, a civil engineer measuring piping, or an architect calculating cable tray runs, determining the sum of multiple, separate lines and polylines can be a nightmare.

Once the TLEN.LSP routine is loaded, using it is straightforward:

The inside the APPLOAD dialog is the officially supported method:

If AutoCAD says TLEN is an unknown command, the LISP file was either not successfully loaded or the command trigger inside the code is named differently. Open the .lsp file in Notepad and look for the line starting with (defun c:XXXX ... . Whatever replaces XXXX is your actual command shortcut.

TLEN.lsp is an AutoLISP script designed to calculate the total length of multiple selected objects simultaneously. While modern versions of AutoCAD (2024 and later) and AutoCAD LT have improved internal measurement tools, many professionals still rely on this lightweight script for its speed and simplicity. It is widely used in industries like irrigation, electrical wiring, and pipeline design to quantify materials quickly. How to Download TLEN.lsp

Speed up your labeling process by auto-generating sequential numbers (e.g., 1, 2, 3 or A, B, C) on your drawings. How to Safely Download TlenLSP

: The script is often shared in the Autodesk Community forums for troubleshooting and updates. How to Install and Run It

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Use this method if you only need to use the tool for your current drafting session. Open your drawing in AutoCAD. Type APPLOAD into the command line and press .

TLEN.LSP is very old, and some users encounter issues, particularly with newer versions of AutoCAD. Here are the most common problems and solutions.