Thyroid diseases are among the commonest endocrine disorders. Hypothyroidism is an insidious condition in which the thyroid gland does not synthesize enough thyroid hormones to meet metabolic requirement of the body which is associated with subtle and nonspecific symptoms with significant morbidity. Hypothyroidism is the leading cause of several complications the commonest being overweight and obesity. The present study was undertaken to evaluate the BMI at the time of diagnosis in hypothyroid patients and compare with that of normal individuals. A comparative study was conducted, 100 cases of hypothyroidism at the time of diagnosis and 100 controls in the age group of 20-40 years, both Males and Females. BMI was calculated, data of T3, T4 & TSH levels were collected & compared between normal and hypothyroid subjects. It was found that hypothyroid subjects had a higher body mass index than the normal individuals. Hence maintenance of thyroid hormones at normal level and regular monitoring of BMI in Hypothyroid patients will help in early detection and prevention of Obesity and its related complications in future.