A highly respected source for AutoCAD routines, Lee Mac's Total Length program provides robust results with customizable unit formats. How to Install and Use TLEN.lsp
: You can select objects individually or via window selection. The script then iterates through each item and sums their lengths
: Used extensively in fields requiring material takeoffs, such as estimating total piping, cabling, or fencing lengths. Where to Download
Many developers host their own versions of total-length LISP routines.
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.