Background: To determine the prevalence of obesity in asthmatic patient and to determine correlation of BMI of asthmatic patient with FEV1 (forced expiratory volume in 1 second). Martial and Methods: We conducted this study on 75 Indian asthmatics with aim is to investigate the role of BMI on asthma severity. Patients who satisfying the predefined inclusion criteria were recruited into the study. All required tests were done including spirometry and calculation of BMI was done. The data obtained was subjected to systematic statistical analysis