Introduction Sport-related concussion (SRC) is considered as mild brain trauma following incidence of direct or indirect hit on the head. Although the signs and symptoms are sound, the frequency of reporting among athletes are still lacking. The study aimed to provide the normative reference of SRC values among school-athletes in Malaysia. Methodology This study was carried out among school-athletes aged between 13 and 17 years old involving sport school nationwide. A standardized questionnaire was used to assess the knowledge and attitude of 396 respondents who provided written consent. Descriptive data were used to derive the normative reference values for SRC using means and standard deviation stratified by contact and non-contact games. The predictors of SRC were determined using a general linear model (GLM). Results Mean score of ranged from 13.75 ± 3.2 for SRC knowledge and 54.23 ± 7.27 for SRC attitude. The t test indicated there was no significant difference between contact and non-contact games athletes (p < 0.05). The GLM shows that sport category is a predictor to attitude towards SRC among non-contact sports athletes. Meanwhile no predictors are found for knowledge and attitude toward SRC for contact sports athletes. Conclusion The normative values provided herein can serve as a guide for interpreting SRC measurements obtained from school-athletes especially from sport school in Malaysia. Many parties can be benefited from the findings especially clinician, coaches, athletes and rehabilitation teams. Furthermore, during a educational awareness, the sport therapists and researchers could use the normal score ranges to document the progress of SRC and provide feedback to the athletes.