When does adult mode apply?
After the adult threshold, the calculator uses WHO or Asia-Pacific thresholds.
BMI by age
Age determines whether BMI should use adult thresholds or pediatric reference ranges.
When does child mode apply?
For children and teens, the result depends on age in months, sex, and selected standard.
Why do months matter in pediatric BMI?
In childhood, a few months can change the reference row and final category.
Resources
BMI articles and guides
Body mass index (BMI)
Everything you need to know about body mass index: how to calculate it, how to understand the result, and when a more precise assessment is needed.
Child BMI calculatorFor children and teens, BMI is compared with age- and sex-based reference ranges instead of adult thresholds alone.
Healthy weight calculatorA healthy weight range estimates which weight corresponds to the selected healthy BMI range for a given height.
Calculate and assess BMI
Check the result in the browser or open the app on your platform for more convenient regular use.