Guide to the AutoCAD TLEN.lsp Download and Setup Calculating the cumulative length of hundreds of lines or polylines manually is a tedious task. Because AutoCAD does not have a single native "Total Length" command in the Properties palette for multiple selections, CAD professionals rely on the routine. This AutoLISP script automates the measurement of multiple objects—including lines, arcs, and polylines—to give you an instant total. Where to Download TLEN.lsp