Community forests provide real benefits, especially the economic value of communities around the forest, and a real contribution to environmental services. One of the benefits of forests is vital for the survival of living things because it has a role in regulating the micro and macro climate. On the other hand, forest destruction can cause climate instability. Sustainable management of community forests has become a necessity due to global economic and political changes. Sustainable Forest Management is a manifestation of the concept of sustainable forestry development. The research aims to calculate the standing potential of Sidomulyo Village FMU Lawu Manunggal, Magetan Regency, the ability of the forest to produce biomass, carbon content, and the ability to absorb C02 content including allometric estimation models through inventory activities for potential by using the method Destructive sampling of the sample of tree species to be measured biomass, stored carbon and carbon dioxide uptake. The results showed the average stand potential was 10,340 m3/ha, or a total volume of 1,046,402 m3, the highest for the Melia azedarach species, at 4,468 m3/Ha. The average forest biomass content per ha is 28,379 tons or a total of 1,773,259 tons. The average carbon content is 13,338 tons C/ha or the total available carbon is 199.85 tons. The ability to absorb carbon dioxide (C02) is 44,789 tons C/Ha, with a community forest management area capable of absorbing 3,058,695 tons of C02 content.