Background: To assess the severity of acute pancreatitis (AP) using computed tomography (CT)severity index (CTSI) and modified CT severity index (MCTSI), to correlate with clinical outcomemeasures, and to assess concordance with severity grading, as per the revised Atlanta classification(RAC). Material and Methods: This is a prospective study, conducted from August 2019 to July2020, in the Department of Radiology, Al Ameen Medical College. A total of 70 patients referred fromthe Department of Medicine and Department of Surgery, presented with the chief complaint ofepigastric pain, nausea and vomiting and CECT abdomen were suggestive of acute pancreatitis wereincluded in this study. Assessment of severity of acute pancreatitis was done in all cases byBalthazar CTSI scoring and Mortele Modified CTSI scoring. Results: In the present study total 70cases of acute pancreatitis cases were included in the study. These patients underwent CT abdomenand pelvis, later images were reviewed by the radiologist. The maximum patients were in the agegroup of 21 to 40 years [n=33 (47.1%)]. Majority of the cases were categorized as mild pancreatitisaccording to Balthazar CTSI score. Majority of the cases were categorized as severe pancreatitisusing the Modified Mortele CTS score. Whereas, organ failure, moderate and severe category inmodified Mortele CTSI, mild, moderate, severe category in Balthazar CTSI. Conclusion: Inconclusion CECT was found to be an excellent imaging modality for diagnosis, establishing theextent of the disease process and in grading its severity.