Foot arch is made up of bony arch and soft tissues which are acts as a shock absorber and helps in transmission and distribution of body weight. Body mass index (BMI) is one of the indicators used to detect body weight and nutritional status. Excessive weight of an adult can affect the occurrence of flat feet compared with adults who have normal weight. Flat feet are a disorder of foot structures that does not form the medial longitudinal arch (MLA) There are various studies who claim the association between high BMI and arch height of medial longitudinal arch in adult population. To know the association of arch height of medial longitudinal arch BMI in adult, this study was carried out