BMI for Age Calculator (Children 2–19)
2–19 yrs
BMI-for-age (also called BMI percentile) is used to assess weight status in children and adolescents aged 2–19. Because children grow rapidly and have different amounts of body fat at different ages, a standard adult BMI cut-off is inappropriate. Instead, BMI is compared to age- and sex-specific reference populations.
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Tip: BMI percentile, not the raw BMI number, determines weight status in children. A BMI of 20 can be healthy at age 15 but overweight at age 8.
- 1BMI is calculated the same way as for adults: kg / m²
- 2The result is then plotted on CDC or WHO growth charts to get a percentile
- 3< 5th percentile = Underweight
- 45th–84th percentile = Healthy weight
- 585th–94th percentile = Overweight
- 6≥ 95th percentile = Obese
Boy, 10 years, BMI 18=~75th percentile — Healthy weightSame BMI at age 5 = 95th percentile (obese)
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