STAN (short for subSTance flow ANalysis) is a free software that supports performing material flow analysis (MFA) according to the Austrian standard ÖNORM S 2096 (Material flow analysis -Application in waste management) un-der consideration of data uncertainties. The main idea behind STAN is the combination of all necessary features of a MFA in one software product: graphical modelling, data management, calculations and graphical presentation of the results. The benefits of the application of STAN are demonstrated on the example of a fictitious waste management company.