Prestressed concrete structures are gaining importance in the construction industry through its
technical and economic advantages. In its calculation process, it is necessary to verify the
prestressing losses, which are inherent to this technology, looking for the best use of materials
and economic structures. Therefore, it is necessary to use computational tools to optimize the
calculation steps. The AutoLISP programming, a language recognized by AutoCAD, and very
employed by designers, allows programming of the equations provided by NBR 6118 for
prestressing losses calculation and draws the strucutural element and the prestressing losses
graphics. Two examples are shown to validate the results of the program. The results obtained
by the program are compared to the values obtained manually. The results show that the
program is effective in the calculation of prestressing losses, for active-active and active-
passive anchorages, as well as the graphs for immediate progressive losses. Another positive
aspect of using the program is the use of more elaborate formulation for progressive losses
calculation provided by NBR 6118, resulting in more precise values.
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