Conservation forest in Indonesia holds main function as biodiversity preservation as well as maintaining forest ecosystem and therefore plays significant role for reducing emission from deforestation and forest degradation (REDD) in East Kalimantan. In order to understand the role of forest to hold emission, the information on current carbon standing stock is highly necessary. This study aims to estimate above-ground carbon from East Kalimantan conservation forest which contribute up to 5.3% of total forest area in this province. The study area is located at Loa Haur education and training forest (Loa Haur forest) part of Bukit Soeharto Grand Forest Park. As many as 48 sample plots were established over 43.1 km² of Loa Haur forests which cover three main land cover types i.e. secondary forest, shrub and bare land. Above-ground biomass from sample plots were calculated using Chave allometric equations, while land cover types were derived from high resolution Sentinel-2A satellite imagery. Carbon was estimated simply by multiplying biomass with conversion factor 0.47. Land cover of study area was carefully classifed using visual interpretation and was validated using forest cover information on the ground (sample plots). Assessment on land cover classification using Kappa index exhibited relatively good result (Kappa index =0.8). Furthermore, this study showed that above-ground carbon stock of secondary forest, shrub and bare land are 111.3 Mg/ha, 10.8 Mg/ha and 4.6 Mg/ha, respectively. These above-ground carbon stock may refers to what is called emission factor and together with information on land cover changes, it can be used as a basis for calculating East Kalimantan carbon emission for certain periodic of times.