Introduction and objective: Apart from overweight and obesity in children and adolescents, footprint alterations constitute one of the main health concerns for parents. The objective of the study was to evaluate the correlation between body mass index (BMI) and plantar posture in Peruvian children and adolescents. Methods: A descriptive cross-sectional study was carried out in 212 children and adolescents aged between 5 to 18 years. Weight and height were determined. In addition, the body mass index for age (BMI/Age) was calculated according to the recommendations of the World Health Organization (WHO). Likewise, the plantar footprint was obtained and classified into flat foot and pes cavus using the arch index (AI). Data analysis was done using IBM SPSS version 27 statistical software. Results: The highest proportion of women presented alterations in the plantar footprint compared to men, these differences were significant (p <0.05). 43.2% of the men were overweight compared to the women (32.7%). Finally, no statistically significant correlation was found between the BMI/Age and the plantar footprint of the participants (p> 0.05). Conclusion: The results of this study do not show a relationship between footprint and BMI/Age. The findings suggest that gender difference is a contributing factor in foot shape and BMI/age in both children and adolescents. Therefore, both groups should be a priority in intervention programs aimed at improving these health conditions.