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BMI Calculator
Enter your height and weight — in centimetres/kilograms or inches/pounds — and get your Body Mass Index with its WHO category, plus the healthy weight range for your height. All calculated locally in your browser.
The formula
BMI = weight (kg) / height (m)2. Under 18.5 is underweight, 18.5–24.9 is the healthy range, 25–29.9 is overweight, and 30+ is obese.
What BMI does not see
BMI cannot tell muscle from fat: athletes and very muscular people can score "overweight" while being perfectly healthy, and it says nothing about where fat is carried. Treat it as a screening number, not a diagnosis — if a result worries you, a clinician or a body-composition scan gives the full picture.
Frequently Asked Questions
What is a healthy BMI?
18.5 to 24.9 for most adults, per the WHO. The tool also shows the matching weight range for your exact height.
Why does my BMI say overweight when I am muscular?
Muscle is denser than fat, so BMI overestimates body fat in muscular people. Waist measurement and body-fat percentage are better follow-ups.
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