BMI Calculator

Enter your weight and height. For US units, enter height in total inches (5 ft 9 in = 69).

How it works

BMI = weight (kg) ÷ height (m)². WHO categories: under 18.5 underweight, 18.5–24.9 healthy, 25–29.9 overweight, 30+ obese.

Frequently asked questions

What is a healthy BMI?
18.5 to 24.9 for most adults.
Why are Asian cut-offs lower?
Health risks rise at lower BMI in Asian populations, so 23 is often used as the overweight threshold.
Is BMI accurate for athletes?
Not always; muscle weighs more than fat.