The Prosocial Tendencies Measure (PTM) and its revised version (PTM-R) are used internationally to measure prosocial behaviors in different life situations. To obtain accumulated evidence of the report and the reliability of its scores, a meta-analysis of the reliability of internal consistency was performed. The databases of Web of Science (WoS) and Scopus were reviewed and all the studies that applied it from 2002 to 2021 were selected. Results: Only 47.9% of the studies presented the index of reliability of PTM and PTM-R. The meta-analytic results of the reliability report of the subscales that the PTM and the PTM-R have in common were: Public 0.78 (95% CI: 0.76-0.80), Anonymous 0.80 (95% CI: 0.79-0.82), Dire 0.74 (95% CI: 0.71-0.76), and Compliant 0.71 (95% CI: 0.72-0.78). Each one of them presents high levels of heterogeneity derived from the gender of the participants (percentage of women), the continent of the population, the validation design, the incentive to participate, and the form of application. It is concluded that both versions present acceptable reliabilities to measure prosocial behavior in different groups and situations, as adolescents and young people, but their clinical use is discouraged.