BMI Calculator
Body Mass Index and weight category from height and weight.
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The formula
BMI = weight(kg) / height(m)²
Body Mass Index scales weight by height squared, giving a single number comparable across people of different heights. It is a screening measure, not a diagnosis — it cannot tell muscle from fat, but it flags when weight is drifting outside the range linked to lowest health risk.
All calculations run locally in your browser and update instantly as you type.
Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
Is BMI accurate for athletes?+
BMI does not distinguish muscle from fat, so very muscular people may read as overweight. Use it as a general guide, not a diagnosis.
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