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BMI Calculator
Calculate body mass index in metric or imperial units
Your BMI
24.2Normal weight
How it works
BMI Calculator — Calculate body mass index in metric or imperial units. All processing happens in your browser — no upload, no signup, no email required. Free forever.
Frequently asked questions
Which BMI formula is used?
Standard WHO formula: weight (kg) / height (m)². For imperial inputs we use the equivalent (lb × 703) / inches², which gives the same result.
Are the BMI categories official?
Yes — Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (≥30) per the WHO classification for adults.
Is BMI suitable for athletes or children?
BMI is a population-level indicator and can be misleading for very muscular individuals, pregnant women or children. Treat the number as a starting point, not a diagnosis.
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