The purpose of this study was to investigate the formal and informal costs of crime by employing a descriptive survey method. The statistical population of this study consists of those convicted of robbery, fraud and intentional assault and released from prison in 1989. Using the available sampling method, 150 individuals were selected as the final sample size. The data-gathering tool used was a researcher-made questionnaire, which was validated by the opinions of three experts. In addition, its reliability was calculated using the Cronbach’s alpha coefficient of 0.81. After explaining the demographic data and distributing the frequency and percentage of questions answered, multivariate analysis of variance and t-test were used for data analysis and the Tukey test was used to determine the differences between groups. According to the findings of this study, investigation of official and informal crime costs of fraud is greater in thieves and in thieves is greater than in the perpetrators of deliberate assault. Also, when assessing formal and informal costs, in general, fraudsters pay close attention to both types of costs, thieves focus on informal costs more than formal costs and perpetrators of deliberate assault and crime pay little attention to official and social costs. The reason for the discrepancy in the assessment of crime costs is due to the forensic nature of the crime, simply put, the fraudsters regarded as white collar criminals knowingly commit the crime, whereas the perpetrators of deliberate assault and intentional assault are regarded as blue collar criminals as they commit spontaneous crimes.