Child Obesity Index Calculator (Rohrer Index)
Calculate the Rohrer Index from sex, height, and weight for an instant read on childhood obesity
Enter your child's sex, height, and weight, and this tool calculates the Rohrer Index — a body composition measure widely used to assess school-age children and adolescents — and places the result into one of four bands, from underweight to childhood obesity. Unlike adult BMI, it's scaled to how children's bodies actually develop, which makes it a useful reference for parents. All calculations run in your browser, so the body measurements you enter are never sent to a server.
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
How to use
- Select your child's sex (boy or girl).
- Enter their height in centimeters and weight in kilograms.
- The Rohrer Index appears instantly at the top, along with the matching reading: underweight, normal weight, borderline overweight, or childhood obesity.
FAQ
- How is the Rohrer Index different from adult BMI?
- BMI divides weight by height squared, while the Rohrer Index divides by height cubed. That reflects the shifting body proportions of a growing child more accurately, which is why it's the standard measure for children and teens aged 2 to 18.
- What score counts as normal?
- By this tool's bands, below 100 is underweight, 100–140 is normal weight, 140–160 is borderline overweight, and above 160 is classified as childhood obesity.
- Is my child's information stored?
- No. Every calculation happens inside your browser, and nothing is stored on or sent to a server.