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BMI-for-age percentile (CDC growth charts), not a fixed number
Underweight <5th percentile · Healthy 5th–84th · Overweight 85th–94th · Obese ≥95th percentile
A growing child’s healthy weight shifts constantly with age and sex, so pediatric BMI is plotted on a growth chart rather than compared to the flat adult thresholds. A pediatrician is the right person to interpret it.
Standard fixed BMI categories
Underweight <18.5 · Normal 18.5–24.9 · Overweight 25–29.9 · Obese ≥30
This is the age range the standard WHO/CDC adult categories were built around, so the fixed cutoffs are most directly applicable here.
Standard fixed BMI categories
Underweight <18.5 · Normal 18.5–24.9 · Overweight 25–29.9 · Obese ≥30
The same adult categories still apply, though natural muscle loss (sarcopenia) can begin in this range — two people with an identical BMI can have very different body composition, so pairing BMI with a body-fat or waist-circumference check adds useful context.
Standard formula, wider healthy band commonly recommended
Research-supported healthy band roughly 23–30, vs. 18.5–25 for younger adults
Several geriatric studies associate a slightly higher BMI with lower mortality risk in this age group (sometimes called the "obesity paradox") — a bit of extra reserve can help buffer illness, while a low BMI is more often linked to frailty and muscle loss. Guidance varies by individual; a doctor should weigh in before treating a result as a health concern.
BMI is calculated with the standard Body Mass Index formula — weight in kilograms divided by height in meters squared (kg/m²) — the same method used by the WHO and CDC.
Your result is then placed into the standard adult categories: Underweight (below 18.5), Normal (18.5–24.9), Overweight (25–29.9), or Obese (30 and above).
Get instant, accurate bmifor women results with our free BMI Calculator for Women. Simple, fast, and always free to use.
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