This study examined the relationship between early childhood risk factors for antisocial behavior and the monetary costs associated with criminal convictions for 379 clinic-referred boys. Participants were assessed using a structured risk assessment instrument, the Early Assessment Risk List for Boys (EARL-20B), intended for use with boys aged 6 -11 with conduct problems. Criminal conviction data were used to calculate costs borne by victims, the correctional system, and other areas of the criminal justice system for participants between the ages of 12 and 20. For the total sample, the average cost per person was $580,181. Using the EARL-20B total score to derive quartile groups, the average lowest and