Child BMI Calculator
Calculate a child's BMI value from weight, height, and age.
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Child BMI
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Exact percentiles vary by age/sex — check with a pediatrician to interpret this value.
How to use the Child BMI Calculator
- Enter your child's weight and height.
- Enter their age in years.
- Read the resulting BMI value.
Frequently asked questions
Why no percentile?
Child BMI percentiles depend on detailed age- and sex-specific growth charts (CDC/WHO tables) that require clinical interpretation. This tool gives you the raw BMI value — for the percentile, check with a pediatrician.