Background: Laparoscopic sleeve gastrectomy has been considered recently as the best single bariatric surgery in morbidly obese subjects. Patient and methods: This prospective study was conducted in Surgery Department, Fayoum University Hospital in the period between August 2013 and August 2014.The study included 20 cases of morbidly obese patients (with BMI ≥ 40 Kg/m² or ≥ 35 Kg/m² assosciated with other comorbidities) and this was via laparoscopic sleeve gastrectomy technique, we used different bougie sizes ranged from 32-46 F. Results: There is a significant relation between the bougie size and the volume excised and the change in BMI detected after six months (large volumes excised were with small bougies sizes), and this correlation is statistically significant P value = 0.005. Conclusion: We can conclude from this study that there is a significant relation between the bougie size and the short term EBWL.