Values produced by formula methods of tree appraisal used in five different countries were compared ((CTLA) - USA, Standard Tree Evaluation Method (STEM) - New Zealand, Helliwell - Great Britain, Norma Granada - Spain, and Burnley - Australia). Nine individuals appraised the same six trees (Quercus palustris, Ulmus americana, Tilia spp., Gymnocladus dioica, Fagus sylvatica and Fraxinus excelsior) using all five methods.