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BMI in Context: What the Number Does and Does Not Tell You

BMI is a one-number screen, not a diagnosis. Here is how to read it honestly — and what to look at alongside it.

A screening tool, not a verdict

BMI is cheap, fast, and consistent — which makes it useful at the population level and fine as a rough personal marker. What it cannot do is tell muscle apart from fat, or describe where the weight sits on the body.

What to pair it with

Waist circumference, waist-to-hip ratio, blood pressure, and basic blood work give a fuller picture than BMI alone.

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BMI Calculator

Estimate BMI from height and weight in either metric or imperial units, with WHO classification.

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Health / Body Metrics

BMI Calculator

Estimate BMI from height and weight in either metric or imperial units, with WHO classification.

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