Biomass study of Acacia auriculiformis, A. catechu, Dalbergia sissoo, Eucalyptus camaldulensis and E. tereticornis was conducted on a five and half-year-old 'Fuelwood Species Trial under Short Rotation' through destructive sampling at Tarahara, Sunsari District of Nepal. The lowest Furnival Index (FI) was the main criteria for selecting a model. Among the six models tested, a transformed model from a power equation was selected. Selected prediction models of tree components and aboveground wood (green as well as oven dry), and their coefficient of determination (R²) values, regression constant and coefficient, correction factor, precision and bias percent of five species are presented. With the exclusion of branchwood models, R² is higher in a range of 88.7% for oven dry stemwood of A. catechu to 99.3% for aboveground wood model of D. sissoo . However, R² is less than 80% in branchwood (green and oven dry) of A. auriculiformis, E. camaldulensis and E. tereticornis showing moderate relationship between branchwood and diameter at breast height. In the case of E. tereticornis , precision is more than 49% which leads to low reliability in biomass estimation resulting in true biomass deviation in a range of approximately 49.51 to 56.74%, so biomass models could not be used for estimation of tree components and aboveground wood. Despite it, generally, precision percent of the selected models has been found less than 15%. Bias percent was found quite large for allometric branchwood model comparatively to stemwood and aboveground wood models. D. sissoo had less than 10% bias. Bias percent was the highest (23.11%) for green branchwood of A. auriculiformis . Others had in a range of 0.5% for green aboveground wood model of D. sissoo to 18.4% for green and oven dry branchwood models of E. tereticornis .