BMI Calculator
Calculate your Body Mass Index and see which weight category it falls into.
Enter your height and weight in either metric (cm/kg) or imperial (ft-in/lb) units, and this tool calculates your Body Mass Index along with the standard World Health Organization category it falls into — underweight, normal weight, overweight, or obese. BMI is a general screening measure and doesn't account for muscle mass, so it's best used as a rough guide rather than a full health assessment.
How to use it
- Choose metric or imperial units.
- Enter your height.
- Enter your weight.
- Your BMI and category appear instantly.
Frequently asked questions
What BMI ranges count as each category?
Under 18.5 is underweight, 18.5–24.9 is normal weight, 25–29.9 is overweight, and 30 and above is classified as obese, per WHO standards.
Is BMI accurate for athletes or very muscular people?
Not really — BMI doesn't distinguish muscle from fat, so muscular individuals can show a higher BMI despite low body fat.
Should I make health decisions based on BMI alone?
BMI is a useful quick screening number, but a full picture of health should come from a healthcare professional considering other factors too.