BMI
Calculator.
Enter your height and weight in metric or imperial units to get your Body Mass Index, the matching WHO category, and the healthy weight range for your height.
What is BMI?
Body Mass Index (BMI) is a simple measure of body fatness based on weight and height. It's used as a screening tool and not a diagnostic — muscle mass, frame size and body composition affect interpretation.
Formula
Metric: BMI = weight (kg) / height (m)² Imperial: BMI = 703 × weight (lb) / height (in)²
WHO categories
Underweight: BMI < 18.5 Normal: 18.5 ≤ BMI < 25 Overweight: 25 ≤ BMI < 30 Obese: BMI ≥ 30