The status of obesity leanness is unknown among Iranian primary-school age children. We measured weight, height, arm, chest, waist, hip and thigh among 1250 boys and 1250 girls aged 6-12 years in Kemanian primary-school to evaluate the status of obesity and leanness. The criteria for leanness, underweight, desirable weight, overweight and obesity used in the present study were percentiles of body mass index (BMI) (kg/m2) : <5th, 5-15th, 15-85th and 85-95th and > 95th respectively. The range of BMI for desirable weight in boys and girls were 13.7-16.5 and 13.4-16.8 respectively. Range of overweight was 16.5-18.4 for boys and 18.8 for boys and 16.8-18.8 for girls. BMI over 18.4 for boys and 18.8 for girls were considered obesity. The mean (Standard deviation – SD) of BMI for both boys and girls was 15.1 (2.1). the mean (SD) of waist –to – hip and chest – to – hip ratio was 0.85 (0.001) and 0.93 (0.001) respectively in this study.