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BMI Calculator
Enter your height and weight to get your body mass index, category and healthy weight range.
BMI
—
Body mass index.
| Category | — |
|---|---|
| Healthy weight range | — |
| Weight | — |
| Height | — |
Show our math
Enter your figures above to see the step-by-step working.
An estimate — not medical adviceEverything computed client-side — nothing leaves this page
How the BMI Calculator Works
Body mass index compares your weight to your height with a single number: weight in kilograms divided by height in metres squared (in US units, 703 times pounds over inches squared). It sorts into ranges — under 18.5 is underweight, 18.5 to 24.9 normal, 25 to 29.9 overweight, and 30 or more obese — and this calculator also shows the healthy weight range for your height.
BMI is a quick population-level screen, not a diagnosis. It doesn’t distinguish muscle from fat, so very muscular people can read high, and it doesn’t capture where fat is carried. Use it as one signal alongside waist measurement and a professional’s advice.
BMI = weight (kg) ÷ height (m)²
Note: an estimate using standard formulas and population averages. It isn’t medical advice — talk to a healthcare professional about your health.
Frequently Asked Questions
How is BMI calculated?
Divide weight in kilograms by height in metres squared. In US units, multiply pounds by 703 and divide by height in inches squared.
What is a healthy BMI?
18.5 to 24.9 is the normal range. Below is underweight; 25–29.9 is overweight; 30 and above is obese.
Is BMI accurate for everyone?
It’s a general screen, not a diagnosis. Athletes with high muscle mass can read as overweight, and it ignores fat distribution, so pair it with other measures.
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