Child Obesity Index Calculator
Calculate the Rohrer Index from gender, height and weight
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Enter your child's gender, height, and weight to calculate the Rohrer Index, a widely used measure for assessing body composition in school-aged children, and see an instant result across four categories from underweight to childhood obesity. Unlike adult BMI, it accounts for children's growth proportions, making it a handy reference for parents, and every calculation runs locally in your browser so no personal data is sent anywhere.
How to use
- Select your child's gender (boy or girl).
- Enter the height in centimeters and weight in kilograms.
- The Rohrer Index and its category — underweight, normal, overweight, or obesity — appear instantly at the top.
FAQ
- How is the Rohrer Index different from adult BMI?
- BMI divides weight by height squared, while the Rohrer Index divides weight by height cubed. This better reflects a growing child's body proportions and is the standard measure for ages 2 to 18.
- What score counts as normal?
- In this tool, below 100 is underweight, 100 to 140 is normal weight, 140 to 160 is borderline overweight, and above 160 is classified as childhood obesity.
- Is my child's data saved anywhere?
- No. All calculations happen entirely in your browser, and nothing is stored or transmitted to a server.