BMI for Children Calculator
Calculate BMI percentile for children and teens.
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A Better Health Metric for Growing Kids
BMI in children and teens (ages 2-20) is interpreted differently than in adults. Because children are constantly growing, their BMI is plotted on age- and sex-specific percentile charts from the Centers for Disease Control and Prevention (CDC). This calculator computes the BMI and then tells you which percentile your child falls into, providing a more accurate assessment of their weight status relative to their peers.
The Formulas Explained
- BMI Calculation: The standard BMI formula is used first.
BMI = weight(kg) / [height(m)]²
- Percentile Ranking: The calculated BMI is then compared against the official CDC growth charts to find its percentile.
- Underweight: Less than the 5th percentile.
- Healthy weight: 5th to less than the 85th percentile.
- Overweight: 85th to less than the 95th percentile.
- Obese: Equal to or greater than the 95th percentile.
How to Use the Calculator
- Enter Details: Input your child's age (between 2 and 20), gender, height, and weight.
- Select Units: Choose between Metric and Imperial units.
- Calculate: The tool will display the child's BMI and their corresponding percentile category.
Real-World Example
A 10-year-old boy is 56 inches tall (142 cm) and weighs 75 pounds (34 kg).
- His calculated BMI is approximately 16.8.
- When compared to the CDC growth chart for 10-year-old boys, a BMI of 16.8 falls around the 75th percentile, which is in the Healthy Weight range.
Frequently Asked Questions (FAQ)
- Why can't I use the regular BMI calculator for my child? A specific BMI value means different things at different ages. A BMI of 22 might be healthy for a 15-year-old but could be classified as overweight for a 7-year-old. The percentile shows how your child's BMI compares to others of the same age and sex.
- What should I do if my child is in the overweight or obese category? If you have concerns about your child's weight, it's very important to speak with a pediatrician or family doctor. They can provide a comprehensive assessment and guidance on healthy eating and activity habits for growing children.
- Is this calculator a substitute for medical advice? No. This tool is for informational purposes only and should not replace a consultation with a qualified healthcare professional.