Y
M
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Results
BMI Value
Percentile
Weight Status Category
Results
Results will appear here after entering details
Methodology & CDC Standards
Child BMI needs to be interpreted relative to other children of the same age and sex. This calculator uses the CDC Growth Charts for children and teens aged 2-19 years to determine the BMI percentile.
BMI Formula: Weight(kg) / Height(m)²
Percentile: Calculated using the CDC LMS method (Lambda-Mu-Sigma parameters), which converts the raw BMI into a Z-score based on age and sex specific distribution data.
*Note: The percentile indicates the relative position of the child's BMI among children of the same sex and age.*
CDC Weight Status Categories
| Percentile Range | Weight Status | Description |
|---|---|---|
| Less than 5th | Underweight | BMI < 5th percentile |
| 5th to 85th | Healthy Weight | 5th ≤ BMI < 85th percentile |
| 85th to 95th | Overweight | 85th ≤ BMI < 95th percentile |
| 95th and higher | Obese | BMI ≥ 95th percentile |
How to Use
- Select gender (Boy/Girl) and unit system (Metric/Imperial).
- Enter the child's age in years and months (e.g., 5 years 6 months).
- Enter accurate height and weight measurements.
- Click 'Calculate Child BMI' to see BMI, percentile, and weight status.
Tips & FAQ
- Child BMI must be interpreted via percentiles (relative to age/sex), not just the raw number.
- The percentile indicates what percentage of peers your child outweighs.
- This tool uses CDC growth charts, suitable for children and teens aged 2-19.
- Results are for screening only; consult a pediatrician for medical advice.
