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Coralline macroalgae are globally distributed rhodopyhtes that remove carbon from their immediate environment and transform it into carbonate sediments through the senescence of their calcified tissues. In this study, the calcium carbonate (CaCO 3) stocks in the tissue of Jania adhaerens and sediments in Tanjung Adang Shoal, Johor were quantified for a 13-month study period. The detailed maps of the geographical distribution based on the spatial and temporal variations of biomass and CaCO 3 were also assessed. The highest amount of biomass, CaCO 3 and organic carbon (OC) stocks in the tissues showed the highest in May 2018 and May 2019. The biomass values ranged from 65 to 143 g DW m−2, which contained 53–147 g CaCO 3 m−2 and 3–11 g OC m−2. These findings provided insights into the biogeochemical cycling of these inputs, which can be used to estimate the overall carbon budget of the macrophyte meadow. • Monsoon events affect the variability of Jania adhaerens distribution. • Drift accumulation of J. adhaerens was highest during the inter-monsoon season. • Senescence of J. adhaerens contributes to carbonate deposition. • The calcified tissues of J. adhaerens are susceptible to ocean acidification. • Measuring CaCO 3 stocks of J. adhaerens helps in understanding local carbon budgets. [ABSTRACT FROM AUTHOR]