This study was carried out at El-Nour Natural Forest Reserve in Blue Nile State, Sudan with objective to predict the crown width and total tree height from its diameter at breast height. Ten models for predicting crown width and fifteen for tree height using diameter at breast height were tested for six selected species. For each species, dbh, total height, bole height and crown width were recorded. DataFit-9 statistical package of the Oakadale Engineering was used to fit the selected models. Akaike's information criterion (AIC), adjusted coefficient of determination (Ra2), root mean squared...