The weightings of the four component indicators of the UNDP's Human Development Index HDI appear to be arbitrary and have not been given justification. This paper develops a variant of the HDI, calculated to reflect peoples' revealed evaluations of education and the productivity of work. The resulting Calibrated human Development Index CDI has a simpler structure, places greater weight on life expectancy and lesser weight on education. It is validated by high correlation with life evaluations from the World Values Survey. The CDI ranks countries much like the HDI. More importantly, its provenance permits it to be used to assess specific policies, regulations, safety standards, life-saving interventions and health-care alternatives. The CDI is a unified tool for policy evaluation and decision support.