This study aims to determine the total cost, revenue, feasibility of business enlargement in Kaliwungu village, Kedungreja District, Cilacap Regency. Location determination in this study was conducted intentionally (purposive). Sampling of respondents in this study used the census method with 35 respondents. Primary data used by interviews and questionnaires, analysis used the revenue and feasibility of the business of enlarging eels in Kaliwungu Village, Kedungreja District, Cilacap Regency. The results of the feasibility study of the business of enlarging eels in Kedungreja Subdistrict Cilacap Regency can be said to be worth the effort. This is obtained from the total cost of Rp.1.723.630.071,-. receipt of Rp. 2.385.297.714,-. It can be seen from the PbP 1.27 years, NPV Rp. 568.507.269,- IRR 58,43%, Net B / C> 1,03 the enlargement of eel is worth trying.