The results of a survey of public attitudes about appropriate length of prison sentences for convicted offenders are reported. Two main questions are addressed: 1) degree of consensus within the population about appropriate sentences for different offenses and 2) the relationship between the desired sentences expressed by the public and the actual time served by offenders in prison. The analysis suggests considerable agreement across various demographic groups on the relative severity of sentences to be imposed for different offenses, but disagreement over the absolute magnitude of these sentences. These results suggest the feasibility of generating consensus on a proportional, just deserts sentencing schedule, but difficulty in establishing the “constant of proportionality.” The sentences desired by the public are found to be consistently more severe than sentences actually imposed, suggesting the need for greater public awareness of current imprisonment practices so that expectations of the determinate sentencing schedules will be realistic and consistent with limited prison capacity.