Aims: The aim of this study was to correlate the "PEAK EXPIRATORY FLOW RATE" as measured by miniature Wright Peak Flow Meter in normal school children between 5 – 18 years with Weight. Objectives: This study was done to correlate Weight of healthy school children with PEFR. Study area: R.G.M. School Sindhanur. Study design: This is an observational study of 495 urban school going healthy children from SINDHANUR. This sample comprised of 268 boys and 227 girls in the age range of 5- 18 years. Results: PEFR increases progressively with increase in Weight. The correlation of PEFR with Weight was statistically significant. Conclusion: The present study has led to the following conclusions. A. There is a positive and statistically significant correlation between PEFR and Weight in the sample of children selected. B. Weight has a less closer correlation with PEFR than height.