✅ Download tlen.lsp (plain text file). ✅ Save it to a permanent folder (e.g., C:\CAD\LISPS\ ). ✅ Run APPLOAD → Load the file. ✅ Type TLEN → Select your objects. ✅ Read the total length.
While TlenLSP itself is a calculator, smart users utilize it to verify lengths before creating custom fields or scripts. It is the go-to tool for before printing a drawing. If you are billing a client by the meter of pipe drawn, TlenLSP is your invoice calculator.
If you cannot get due to IT restrictions or AutoCAD version issues, try these native or free alternatives.
AutoCAD has a native FIELD command that can display the length of an object. However, the native field command is clunky when you want the total length of a group of lines (like a network of pipes).
TLENLSP is a LISP compiler that allows users to compile LISP code into executable files that can be loaded into AutoCAD. TLENLSP provides several benefits, including:
(often referring to the popular Tlen.lsp routine) is a customization script written in AutoLISP. While there are variations, the most famous version of this tool focuses on Polyline Length Management .
offer highly polished, professional-grade alternatives that include both total length and area calculations. Autodesk Community, Autodesk Forums, Autodesk Forum How to Make It Work Solved: New tlen.lsp for polylines - Autodesk Community