More and more businesses are exploring new business models that incorporate the principles of the circular economy. These businesses need an increasing number of indicators to measure their degree of circularity and its effects on the environment, to guide their approach and strategies. Faced with these challenges, the members of Entreprises pour l’Environnement (EpE) and the Institut National de l’Economie Circulaire (INEC) initiated a project for circular economy indicators in business. Several joint working groups collected the experiences of member businesses. This publication draws on that project, as well as about 22 case studies, to illustrate possible solutions to these questions in concrete terms.