K Karawang Regency is one of the regions that has been designated as the national rice barn in West Java by contributing to the national rice demand of 811,485 tons/year. On the other hand, the development of Karawang Regency as one of the economic strategic areas, especially in the industrial sector, has resulted increasing numbers in population and non-agricultural economic activities. It has an impact on rapidly demand for built up areas, so that it has the potential for the conversion of rice fields to become housing and industrial. The purpose of the study is to identify the impact of the conversion of rice fields on the role of Karawang Regency as one of the national rice barns. The analytical method used is the calculation of the 2020-2035 rice scale, which is to compare the rice production and rice consumption of the residents of Karawang Regency. The development of rice production is calculated based on projected changes in area rice fields, while the amount of rice consumption is calculated based on the projected population. The results of the analysis show that in the period 2000-2019 there was a change of function of rice fields of 549.60 Ha or around 29 Ha / year. With the assumption that rice fields will continue to decline according to their development trend, the rice balance in 2029 will experience a rice deficit of 1097 tons. This study shows that if the RTRW is implemented consistently, in 2030 the rice scale will also fall on a deficit of 1873 tons. Therefore, efforts need to be made. among others, the implementation of policies on LP2B and compact cities to control the conversion of rice fields in Karawang Regency so that the function as a national barn can be maintained.