About this tool
Body mass index compares weight to height. It is a quick screening number, not a diagnosis, and it does not measure body fat directly.
How to use BMI Calculator
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Press Calculate to see your BMI and category.
Frequently asked questions
What BMI ranges are used?
Under 18.5 is underweight, 18.5 to 24.9 is normal, 25 to 29.9 is overweight and 30 or above is obese, per WHO adult categories.
Is BMI accurate for everyone?
No. Athletes, older adults and children can get misleading results. Talk to a health professional for personal advice.