For foresters, it is sometimes required to estimate the diameter at breast height of tree that has been cut, though it is often only the stump that is available as an indicator of size, after illegal logging and quick removal of the cut trees from the forest. In this study, equations for predicting the diameter at breast height, were fi t specifi cally for Quercus frainetto in the region of Evros in northeastern Greece. The selected equations (quadratic model) were, where d is the estimated diameter at breast height d (cm), and d st is the measured diameter at stump height (cm);