Adult thresholds
The reference categories are under 18.5, 18.5–24.9, 25–29.9, and 30 or above.
Calculators · Local processing
BMI Calculator
Calculate adult body mass index in metric or imperial units with responsible screening context.
Adult BMI screening reference
Calculate body mass index
BMI is a screening metric, not a diagnosis. It does not directly measure body fat or describe an individual’s overall health.
BMI22.9
Normal range
Adult healthy-BMI reference: 18.5–24.9
BMI-derived weight reference for this height: 56.7–76.3 kg
The practical guide
Treat BMI as a screening reference, not an individual diagnosis.
Metric and imperial inputs use standard adult BMI thresholds and show a clearly framed BMI-derived weight range.
Important limitations
BMI does not directly measure body fat, muscle mass, bone density, fitness, or individual health.
Reference, not ideal weight
The displayed weight interval is only the mathematical range associated with BMI 18.5–24.9 at the entered height.
Privacy by architecture
Your files and tool inputs stay in your browser.
The selected files, inputs, settings, and outputs are processed in this page and are not uploaded to any server.
Questions, answered
Frequently asked questions
Is BMI a diagnosis?
No. It is a population-level screening metric and cannot diagnose individual health.
Can athletes have a high BMI?
Yes. BMI cannot distinguish muscle from fat, so muscular people can be classified above the normal range.
Is this intended for children?
No. Child and teen BMI uses age- and sex-specific percentiles that this adult calculator does not provide.