Objective. It is unknown whether the public accurately estimate socioeconomic health inequality and whether they wish to see it reduced or eliminated. Methods. Representative samples of the UK and US indicated the perceived and ideal lifespan of people working in “higher managerial/professional” and “routine” occupations. We present perceived and desired lifespan ratios for each sample and for key socio-demographic variables. Results. The UK public estimated the lifespan of professionals to be 5.9% longer than routine workers (true value of 5.8%), and 67.8% (UK) and 53.7% (US) participants correctly identified that professionals live longer than routine workers. In both populations, the median respondent expressed equal ideal lifespans for routine workers and professional workers. Conclusion. The UK public appear well-appraised on the average lifespan for professionals and routine workers. Across nationalities and most socio-demographic groups, the median respondent was aware of social class inequalities in lifespan and preferred that they be eliminated.