We evaluated carbon stocks in the above-ground biomass (AGB) of two dominant mangrove species (Avicennia marina and Rhizophora mucronata) in the Chinnapalam mangrove, Pamban, Southeast coast of India. We examined whether these carbon stocks vary with spatial locations (Central region vs. Western region) and with seasons (pre-monsoon, summer, monsoon, and post-monsoon). Among the two studied species, R. mucronata showed the maximum above-ground biomass (AGB) and above-ground carbon content (AGCC) (t ha‑1) followed by A. marina (t ha-1). The AGB varied significantly with spatial locations (p < 0.05) but not with seasons (p < 0.05). The variation may be attributed to different environmental conditions to which these areas are exposed such as higher siltation and salinity in the central region compared to the western region. The relatively higher salinity in the central region caused the subsequent lowering of biomass and stored carbon of the selected species. There is no previous study available relevant to carbon storage and this is the first-hand study of carbon sequestration in Chinnapalam mangrove.