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BMI calculator: what the number means (and what it doesn’t)
Use a free BMI calculator responsibly — understand categories and the limits of BMI as a health signal.
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Open BMI calculator →Using BMI carefully
BMI is a simple height–weight ratio used in population health. It does not diagnose disease and can misclassify muscular or elderly people.
- Open the BMI calculator.
- Enter height and weight in the units shown.
- Read the category as a rough signal only.
For personal health decisions, talk to a qualified clinician — Make QR calculators are informational aids.
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