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The aim of the paper was to estimate total dendromass in young stands of European beech (Fagus sylvatica L.) and sessile oak (Quercus petraea [Matt.] Liebl). We established 7 plots for beech and 7 plots for oak considering stand size (mean tree diameter) gradient. Then, whole-tree samples including foliages, branches, stem and coarse roots were taken, oven-dried and weighed. We constructed allometic relationships for all tree compartments using tree height and/or diameter on stem base as independent variables. Moreover, soil cores for fine roots (diameter up to 2 mm) estimation were taken. Biomass for all tree compartments was calculated on a hectare base. We found that the total dendromass in the stands cca 10-year-old was over 40 t per ha. Biomass allocation into the tree compartments changed with stand size, and some inter-specific differences were also found. Most probably, carbon accumulated in the soil prevailed over carbon fixed in the dendromass. In spite of this fact, we concluded that dendromass of young stands (trees) would not be neglected in the global carbon budget calculations.