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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).
Calculate bmifor men instantly with our free BMI Calculator for Men. Trusted formulas, instant results, no sign-up required.
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