Calculate Body Mass Index
Calculate Body Mass Index from height and weight, with the standard weight-category ranges.
BMI doesn't distinguish muscle from fat and isn't accurate for athletes, children, or pregnant people. Use it as a rough screening number, not a diagnosis.
Switch between metric (cm, kg) and imperial (ft/in, lb) with the units toggle.
Weight in kg divided by height in metres, squared.
See where your BMI falls against the standard WHO adult ranges.
Frequently asked
What do the BMI categories mean?
Underweight is below 18.5, Normal is 18.5–24.9, Overweight is 25–29.9, and Obese is 30 or above. The standard WHO adult ranges.
Is BMI accurate for everyone?
No. BMI doesn't distinguish muscle mass from fat, so it can overestimate body fat in muscular people and underestimate it in others. It also isn't designed for athletes, children, or pregnant people.
Is this medical advice?
No. This is a general-purpose estimate for informational purposes only, not a diagnosis or medical advice. Talk to a healthcare provider about what a healthy weight range looks like for you.