Head circumference (HQ is one of the most significant findings in physical examination, especially in the evaluation of the development and early diagnosis of neurological disorders in children. In the standard charts for developmental evaluation of Turkish children, there is no HC reference values for children over 6 years of age. Since the HC standards show differences among races and generations, many researchers have obtained normal values for their own populations, and recommend periodic reevaluation of these standards. In this study, the HC of 1826 healthy children (945 male, 881 female) aged between 6 and 12 years was measured in order to establish the Turkish standards. The sample represented various socioeconomic levels in the city of Malatya, Turkey. The study was conducted in ten schools and measurements were done twice by a pediatrician and the mean was recorded. Charts and graphs for boys and girls were prepared separately. Results were compared to the values of other populations. HC values of Turkish children were similar to that of Irish children. The data obtained in this study may replace the Nelhaus criteria to be used in clinics. However, a more widespread study should be carried out by including children from different regions of Turkey. (C) 2001 Elsevier Science B.V. All rights reserved.