Adult screening estimate
BMI calculator
Estimate adult body mass index from height and weight using metric or US measurements.
Estimate BMI
For adults age 20 and older. This is a screening measure, not a diagnosis.
Estimated BMI
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Discuss health questions with a qualified clinician who can consider your full circumstances.
BMI formulas
Metric: weight in kilograms ÷ height in meters²
US: 703 × weight in pounds ÷ height in inches²
US: 703 × weight in pounds ÷ height in inches²
How to interpret BMI carefully
For adults, 18.5 through 24.9 is commonly used as the standard range. BMI is only a screening measure: it does not directly measure body fat and can misclassify people based on muscle mass, age, sex, ethnicity, and other individual factors.
Important limitations
- This adult calculator is not appropriate for children or teens.
- It cannot diagnose any condition or determine an individual healthy weight.
- Pregnancy, athletic build, and other circumstances can make BMI less informative.
Reference: CDC Adult BMI Calculator.
Medical framing reviewed September 25, 2026. See our calculation methodology and health-content policy.