Background: The arches of foot provide functions of force absorption, base of support and acts as a rigid lever during gait propulsion. The assessment of plantar arch development, by the relationship between arch region width and heel region width obtained on a footprint, is proposed by Engel and Staheli‟s. Objectives: The purpose of study the correlation between Planter Arch Index and BMI in young adults. Methods: All 30 participants were given informed consent and were assessed according to age group i.e, 20-25 years. The BMI was calculated and planter arch index was taken with the help of Staheli’s PLANTER ARCH INDEX. The footprint was taken and A value (Width of central region of footprint) and B value (Width of heel region of footprint) were calculated and both value were correlated and result was found. The study design was Correlation. The statistical analysis was Pearson’s Corelation. Results: All subject were assess with the steheli’s planter arch index and their BMI was calculated. According to Pearsons’s Correlation, the r value of right side (0.36) and r value of left side (0.43) suggest that there is a positive correlation. Conclusion: The plantar arch index is easy to obtain from footprints and that there are no differences in Right and Left Side. There is a significant correlation between plantar arch index and BMI. This may lead to long term flat feet due to changes in arches especially medial longitudinal arch. There is no difference in right side and left side to BMI. Both are correlating with BMI.