This study aims to analyze the value of organic carbon content and CO₂ uptake in the leaves, roots and sediments of Sonneratia alba mangroves. The research location was in the area of Marine and Brackish Water Cultivation area of Probolinggo City. The research method used was a survey method and the sampling was done by a non-destructive method. The results show that the highest average biomass value in the leaves, roots, and sediments respectively is in the ratio of 7: 8: 9. The highest average carbon content value in the leaves, roots, and sediments respectively is the ratio of 14: 17: 1. The conclusion in this study is that the carbon content in each component of the leaves, roots and sediments is 20.72 g. m^-2, 24.76 g. m^-2, 1.49 g. m^-2, respectively and the carbon dioxide uptake in the leaves, roots, and sediments is 90.80 g. m^-2, 75.98 g. m^-2, 5.46 g. m^-2 with a ratio of 14: 17: 1.