How to use the bmi calculator
- Choose metric or imperial units.
- Enter your weight and height.
- Click Calculate BMI to see your BMI and category.
BMI categories for adults
- Under 18.5: underweight
- 18.5 to 24.9: healthy weight
- 25 to 29.9: overweight
- 30 or more: obesity
BMI is a simple screening number. It does not measure body fat and can be misleading for athletes, older adults and growing teenagers. Talk to a doctor about your health.
Frequently asked questions
How is BMI calculated?
BMI is weight in kilograms divided by height in metres squared.
What is a healthy BMI?
For most adults a BMI between 18.5 and 24.9 is considered a healthy weight.
Is BMI accurate for athletes?
Not always. Muscle weighs more than fat, so very muscular people can have a high BMI without excess body fat.
Is this medical advice?
No. It is a general screening tool. Ask a healthcare professional about your health.