Introduction: Transurethral resection of prostate (TURP), remains the gold standard surgery for benign prostatic hyperplasia, but ideally recommended for prostate less than 80 grams, with option left open for larger sizes, subject to surgeon's expertise. The present study was aimed to prospectively compare the outcomes of TURP in small (≤80 grams) versus large (>80 grams) prostatomegaly. Material and methods: Peri-operative, immediate post-operative (before discharge), early (upto 1 month) and late (1 year post-op) complication, were compared between the two groups. A p-value less than 0.05 was taken as significant. Result: Out of the total 162 patients undergoing TURP during the study period, 128 were enrolled, with 96 patients (mean age 71.7±10.2, range 52-94 years) completing 1 year of follow-up included in final analysis, and those with prostate size ≤80 grams (n=60, mean size 51.8±11.8, range 35-78) were compared to those >80 grams (n=36, mean size 96.4±15.2, range 82-140). Patients with larger prostates had worse pre-op International Prostate Symptom Score, (p=0.000), more incidence of urinary tract infections (p=0.050) and obstructive nephropathy (p=0.023). They also had higher operative time (p=0.000), peri-op fall in hemoglobin (p=0.016), prolonged post-op catheterization (p=0.000), need for recatheterization due to bladder clots (p=0.023), longer hospital stay (p=0.000), and higher rate of re-admission (p=0.008) versus patients with small prostate. However, the long-term outcomes on 1 year follow-up were comparable in both the groups. Conclusion: The size of prostate does impact the peri-operative and early post-op complications, but the long-term result are gratifying and comparable in small and large prostates.