Mangroves exist in the inter-tidal zone of sheltered tropical and subtropical coasts, and in Southeast Asia are home to 42 tree and shrub species found nowhere else (Giesen et al. 2006). These ‘true mangrove species’ and other associate species are adapted to marine and brackish conditions and are capable of sequestering and storing large amounts of atmospheric carbon dioxide. This guide outlines a simple, low-cost methodology for measuring mangrove carbon stocks and monitoring mangroves in defined project areas. This is the third in a series of four publications intended to be used in conjunction with establishing sustainable financing for mangrove protection in Asia. The titles and links of the four publications are as follows: Financing for mangrove protection; Mangrove-related policy and institutional frameworks in Pakistan, Thailand, and Viet Nam; Mangrove carbon estimator and monitoring guide; Incentive allocation for mangrove protection.