Toddler BMI Calculator
Toddler BMI-for-Age
Calculate BMI percentile for children aged 2-5
Formula
BMI = Weight (kg) / Height (m)² | Weight: lbs × 0.4536 = kg | Height: in × 0.0254 = m | Percentile based on CDC BMI-for-age growth charts.
Frequently Asked Questions
Why is BMI-for-age used for toddlers instead of regular BMI?
Children's body composition changes as they grow, so BMI is interpreted differently than for adults. BMI-for-age uses age- and gender-specific percentiles from CDC growth charts to determine if a child's weight is healthy relative to their height and age.
What is a healthy BMI for a 3-year-old?
For a 3-year-old, a healthy BMI typically falls between 14.5 and 17.5, but the exact range depends on gender. What matters is the percentile: between the 5th and 85th percentile is considered healthy weight.
At what age can you start calculating BMI for children?
CDC BMI-for-age charts begin at age 2 (24 months). Before age 2, weight-for-length is used instead of BMI to assess growth. Your pediatrician tracks both metrics at well-child visits.
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