BMI Formula:
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BMI-for-age is a measure that takes into account a child's age and sex when assessing their weight relative to height. Unlike adults, children's body composition varies as they age and differs between boys and girls.
The calculator uses the standard BMI formula:
Where:
Note: For children, the calculated BMI should be plotted on a growth chart to determine the percentile for age and sex.
Details: BMI-for-age is the recommended measure for screening overweight and obesity in children aged 2-20 years. It helps identify potential weight problems that may lead to health issues.
Tips: Enter weight in kilograms and height in meters. For accurate results, measurements should be taken with minimal clothing and no shoes.
Q1: How is BMI different for children than adults?
A: For children, BMI is age- and sex-specific and is interpreted using percentile growth charts rather than fixed categories.
Q2: What BMI percentile indicates overweight in children?
A: Typically, 85th to 94th percentile = overweight; 95th percentile or higher = obesity.
Q3: Why use BMI instead of just weight?
A: BMI accounts for both weight and height, providing a better indicator of body fatness than weight alone.
Q4: Are there limitations to BMI for children?
A: BMI doesn't distinguish between fat and muscle mass, so athletic children may have high BMI without excess fat.
Q5: Where can I find BMI-for-age growth charts?
A: The CDC provides standardized growth charts for boys and girls aged 2-20 years.