BMI Calculator
Quickly calculate your Body Mass Index (BMI) and see which weight range it falls into.
BMI is a general indicator and doesn't replace a medical evaluation. Factors like muscle mass, age and body composition also affect health.
Body Mass Index (BMI) relates weight and height and is used by the World Health Organization as an initial reference to indicate whether someone is underweight, at a normal weight, overweight, or in a class of obesity. It's calculated by dividing weight in kilograms by height in meters squared.
How to use
- Enter your weight in kilograms.
- Enter your height in centimeters.
- See your calculated BMI and the matching category.
Frequently asked questions
How is BMI calculated?
BMI is calculated by dividing weight (in kg) by height (in meters) squared: BMI = weight ÷ height².
Is BMI an exact measure of health?
No. BMI is a general, population-level indicator. It doesn't distinguish muscle mass from body fat, so athletes or very muscular people can have a high BMI without excess fat.
What are the BMI category ranges?
Per the WHO: below 18.5 is underweight; 18.5 to 24.9 is normal weight; 25 to 29.9 is overweight; 30 to 34.9 is obesity class I; 35 to 39.9 is obesity class II; and 40 or above is obesity class III.