Summary 1. The growing interest in functional diversity has been accompanied by a proliferation of indices proposed to calculate its different components; however, empirical studies have been hampered by a lack of integrated tools for their easy calculation based on field data sets. 2. We present FDiversity, a free, user‐friendly, open source‐based software package for the calculation and integrated statistical analysis of most functional diversity indices and metrics published to date. 3. This tool greatly facilitates the analysis of functional diversity patterns and also the links of different dimensions of functional diversity with environmental factors and ecosystem properties and services.