_____________________________________________________________________________________________________ *Corresponding author: Email: bsarker481@gmail.com; South Asian Journal of Social Studies and Economics 1(3): 1-8, 2018; Article no.SAJSSE.41721 Gross Margin and Factor Analysis of Watermelon Production in Patuakhali District, Bangladesh Bishwajit Sarker 1* , Shankar Majumder 2 , Sheikh Mohammad Sayem 2 and Md. Shaikh Farid 1 1 Sylhet Agricultural University, Sylhet, Bangladesh. 2 Bangladesh Agricultural University, Mymensingh, Bangladesh. Authors’ contributions The work has been carried out from author BS master’s thesis and collaboration with supervisor author SM and co- supervisor author SMS. Author BS designed the study, performed the descriptive statistical analysis wrote the protocol and wrote the first draft of the manuscript. Authors SM, SMS and MSF managed the other analyses of the study. All authors managed the literature searches, edited the manuscript, read and approved the final manuscript. Article Information DOI: 10.9734/SAJSSE/2018/v1i325792 Editor(s): (1) Turgut Tursoy, Associate Professor, Department of Banking & Finance, Faculty of Economics & Administrative Sciences, Near East University, Turkey. Reviewers: (1) Abdulhameed Girei, Nasarawa State University, Nigeria. (2) Shmatkovska Tetiana Oleksandrivna, Lesya Ukrainka Eastern European National University, Ukraine. (3) Pradeep Mishra, Jawaharlal Nehru Krishi Vishwa Vidyalaya, India. Complete Peer review History: http://prh.sdiarticle3.com/review-history/25102 Received 21 st March 2018 Accepted 8 th June 2018 Published 12 th June 2018 ABSTRACT This study examined the Gross margin and factor productivity of watermelon production in Patuakhali district, Bangladesh. A multi-stage stratified sampling design had been used for the selection of the watermelon growing farmers. Data were obtained with the aid of a pre-tested structured questionnaire. The socio-economic characteristics of the respondents was described and categorized by Descriptive statistics, Gross margin analysis was used to analyze the cost and returns to watermelon production and Cobb Douglas production function was used to evaluate the input factor productivity. Results showed that the farmers are relatively middle-aged with an average age of 41 years with a sizable number of the respondents (1.7%) having passed through tertiary education. It was also observed that the farmers are typically smallholders with an average farm size of 50-249 decimal. The result of the gross margin analysis showed that watermelon production is profitable with a gross margin of Tk 756 per decimal. The result of the Cobb Douglas production function shows that the coefficients of cost of seed (0.137), cost of tillage (0.227), cost Original Research Article