How BMI is calculated
BMI divides weight in kilograms by height in metres squared. The number is a screening measure; it does not directly measure body fat or diagnose health.
Who this is for
Adult categories are intended for adults aged 20 and over. Children and teenagers need age-specific assessment. Do not treat a displayed weight range as an individual target.
Reference: CDC adult BMI guidance.
Frequently asked questions
Can BMI diagnose a health problem?
No. It is one screening measure. A clinician considers medical history and other findings as well.
Can I use adult categories for a child?
No. Children and teenagers need age- and sex-specific assessment.