Background: Height is an anthropometric measurement which serves as the most constant indicator of growth. Arm span can be used as an alternative to height measurements in certain circumstances. This study aims to analyze the correlation between anthropometric measurements of height and arm span in children aged 7-12 years. Methods: A cross-sectional study was carried out from September to December 2019 in six elementary schools in Bandung. Subjects were children aged 7-12 years who were recruited with a multistage cluster random sampling method. Children with scoliosis, contractures and stunting were excluded from the study. Height and arm span were measured by 2 trained pediatricians. Findings: A total of 1,114 children, comprising 596 boys and 518 girls, fulfilled the inclusion criteria. The ratio of height and arm span was 0.98-1.01. The regression equation used to predict height through measurement of arm span in male subjects was Height = 21.8623 + 0.7634 x Arm span (cm) + 0.0791 x age (month); R2 = 94%; standard error of estimate (SEE): 2.66 and that in female subjects was Height = 21.2395 + 0.7779 x Arm span (cm) + 0.0701 x age (month); R2 = 95.4%; SEE: 2.39. The predicted height and the average actual height were not significantly different. From the concordance correlation test, the results obtained in a row on male and female subjects were concordance correlation coefficient (CCC) = 0.9693, precision (p) = 0.9698 and accuracy (Cb) = 0.9995 and CCC = 0.9764, p = 0.9767 Interpretation: There is a strong correlation between height and arm span in children aged 7-12 years. Arm span can be used to predict the actual height children aged 7-12 years and as an alternative measurement for growth. Funding: Nil Declaration of Interests: The authors declare that they have no competing interests. Ethics Approval Statement: This study has been approved by the Research Ethics Committee of the Faculty of Medicine Universitas Padjadjaran (approval number 1171/UN6.KEP/EC/2019)