In the context of the capability approach (CA), a lot of indicators have been developed. This paper investigates how these indicators can inform sustainability research. After a brief introduction into the CA, the second section investigates which dimensions are relevant and how to select dimensions. The third section addresses the problem how indicators for these dimensions can be selected and developed. The fourth section is dedicated to finding indicators that capture the extent of freedom of choice - crucial to the CA - people enjoy. The fifth section summarizes how and which indicators have been used in the CA context for nature, the environment and sustainability. The paper concludes that the environment and the issue of sustainability are under-investigated in the CA context. Further, while sustainability research is driven by the quest of policy recommendation, most CA studies rather aim at evaluating situations. Hence, there is a need to go beyond evaluation in order to apply the CA successfully to the issue of sustainability. For the purpose of illustration, an exemplary questionnaire is suggested in the appendix.