Aims: Computed tomography, measure variations in the depth of olfactory fossa (OF) and characterise India's population according to the Keros categorization (CT). Materials and Methods: This study was conducted in our institution over a period of 1 year (June 2018 to June 2019). Patients >16 years of age undergoing CT scan of paranasal sinuses (PNS) were included. A total of 1200 patients' PNS CT scan studies were evaluated. The vertical height of the lateral lamella was used to determine the depth of OF. Independent samples t test and Chi Square test were used to examine the results by gender and laterality. Results: OF had a mean depth of 5.16 ± 1.59 mm. The mean depth of OF between males and females was statistically significant, but not between right and left sides. Keros type I was discovered on 210 sides (17.5%), type II on 895 (74.6%), and type III on 95 sides (7.9 percent). Conclusion: Even while the prevalence of the harmful type III OF is modest, it is considerable, particularly among men and on the right side. To avoid iatrogenic consequences, a preoperative assessment of depth is required.