Online Tools

    BMI Calculator

    Calculate adult body mass index with metric or US units, see the CDC/NHLBI BMI category, and review healthy-weight range context.

    BMI is an adult screening measure. It does not diagnose disease and does not directly measure body fat, muscle, pregnancy changes, or fluid retention.

    What This BMI Calculator Does

    This calculator estimates adult body mass index from height and weight, then labels the result using standard adult BMI categories. It supports metric and US customary units because English-language search results commonly expect both.

    Adult body mass index formula.

    Screening only
    BMI is a screening measure, not a diagnosis. It does not directly measure body fat, pregnancy changes, fluid retention, or athletic muscle mass.

    How To Interpret The Result

    Adult BMI categoryBMI range
    UnderweightBelow 18.5
    Healthy weight18.5 to 24.9
    Overweight25.0 to 29.9
    Obesity30.0 or above

    Use the number as a first pass. Waist circumference, lab values, medical history, medications, and fitness level can change the meaning of a BMI category for an individual person.

    Frequently Asked Questions

    Sources and References

    Calculations are based on the listed reference sources. Links open in a new tab.

    Updated:

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