A method for calculation of at least one software usage metric is disclosed, the software usage metric describing a plurality of software products installed in a computing infrastructure including a plurality of computing machines organized into a plurality of computing groups. The method includes installing a first set of software products in each computing machine in a first computing group of a plurality of computing groups, scanning one computing machine in the first computing group to discover that the first set of software products are installed thereon; and calculating an overall usage metric for the first computing group based on a number of computing machines belonging to the first computing group and the discovered first set of software products.