INTRODUCTION:Infertility is considered one of the main public health issues and about 40% -50% males are involved in the infertility cases. The most common cause of male infertility is abnormal semen parameters. Ultrasound examinations of scrotum and semen analysis are the common investigations done in evaluating male sub fertility. An atrophic testis is closely associated with oligospermia. OBJECTIVE: To correlate the testicular volume as measured with ultrasonography and sperm count of the males METHODS: Patients aged between 27 and 48 years were our study participants. Fifty males who presented for infertility evaluation unit were investigated with ultrasonography of testes and semen analysis. RESULTS: The tendency of the graph showed increase in sperm count in relation to increase in testicular volume. Smaller the testicular size, lesser was the sperm count. CONCLUSION: Our comparative prospective study showed that small testicular size was associated with decreased sperm count and as the testicular size increases the sperm count also increases.