The standard of living is a conceptual object of great concern to governments, social scientists, and the public. How people lived in the past is likewise of much interest to historians. There is wide (if not universal) agreement that a higher standard of living is preferable to a lower one. Congruence ends there, however, as what constitutes the appropriate measure of people’s well-being is subject to a wide range of parallel, overlapping, and sometimes even conflicting opinions. How to collect the evidence necessary to calculate whatever measure we settle on, from both the contemporary world and the historical record, is equally contested. Indeed, in the case of efforts to measure well-being in the past, the evidence we might want may not exist at all. The question is too important though to settle for narrow and often misleading metrics that capture material wealth alone. Measures of our lifespan, the expansion of our mental capabilities, and our ability to feel secure and to participate in our collective governance make essential contributions. Finally, we need measures that are sensitive to the requirements for shared human sociability in different historical contexts. The insights of historians and other observers of human societies will be essential to complement the theorizing of social scientists.