From which evaluative base should we develop public policies designed to promote wellbeing among different cultural groups in different circumstances? This article attempts to advance an objective, universal theory of cultural evaluation grounded in a eudaemonistic account of human wellbeing. The approach evaluates cultures on the success with which they enable societies to promote the wellbeing of individuals through provision of needs and capabilities within their given, determinate circumstances. This provides the basis for a normative functionalism capable of identifying and explaining cultural deficits.