Background: Sex determination from skeletal remains is of great significance for Forensic experts, archeologist and anthropologists for identification of the deceased. Although many bones exhibit clear cut sexual dimorphism but to determine the sex with 100% accuracy, metric measurements are to be used.These indices and their demarking points exhibit significant variation in range according to geographic location& ethnicity. Hence several studies are carried out to calculate anthropometric data regarding various measurements & indices for a particular region. Aim: To assess reliability of sacral index in sex estimation and comparison with Sacral index of various regions of India. Materials & Methods: 100 fully ossified adult human sacrum of known sex (58 male and 42 female) was collected from Department of Anatomy,SMS Medical College, Jaipur, Rajasthan.Measurements were taken by using sliding venire caliper. DP (demarking points) were calculated. Data collected were statistically analyzed. Results: The average value of sacral index for male was 96.25 and 113.33 for females. Present study concluded that by using sacral index as a single parameter 46.55% male and 57.14% femaleSacrawere identified as male and female respectively. Conclusion: For sex determination of sacrum, maximum numbers of parameters should be considered.