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BMI Formula for Kids:
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BMI (Body Mass Index) is a measure that uses height and weight to estimate body fat. For children, BMI is age- and sex-specific and is often referred to as BMI-for-age. It compares your child's weight and height to growth charts for children of the same age and sex.
The calculator uses the standard BMI formula adapted for children:
Where:
Explanation: The result should be compared to CDC or WHO growth charts to determine the child's percentile for their age and sex.
Details: Tracking BMI-for-age helps identify children who are underweight, at a healthy weight, overweight, or obese. Early identification can help prevent health problems associated with abnormal weight.
Tips: Enter weight in kilograms and height in centimeters. For accurate results, measure height without shoes and weight with minimal clothing. The calculator automatically converts cm to m for the calculation.
Q1: What is a healthy BMI for children?
A: Healthy BMI ranges vary by age and sex. Generally, BMI between the 5th and 85th percentiles is considered healthy weight for age.
Q2: How often should I check my child's BMI?
A: Pediatricians typically check BMI at annual well-child visits. More frequent checks may be recommended if weight concerns exist.
Q3: Does BMI account for muscle mass in athletic children?
A: No, BMI doesn't distinguish between muscle and fat. Athletic children may have higher BMI due to muscle mass rather than fat.
Q4: Where can I find growth charts to interpret the results?
A: CDC and WHO provide growth charts online. Your pediatrician can also help interpret your child's BMI percentile.
Q5: What should I do if my child's BMI is outside the healthy range?
A: Consult with your pediatrician. They can evaluate growth patterns over time and recommend appropriate next steps.