Know my fitness
Body Mass
Index
Calculate your BMI instantly. Supports metric and imperial units. Results update as you type.
BMI Calculator
Your measurements
BMI Categories
Underweight
< 18.5Normal
18.5 – 24.9Overweight
25.0 – 29.9Obese
≥ 30.0Note for runners
BMI doesn't account for muscle mass or body composition. Trained runners often carry more lean mass than the general population and can show a higher BMI despite low body fat. Use it as a rough guide, not a definitive measure of fitness or health.
Your result
BMI Score
Underweight
Normal
Overweight
Obese
Enter your height and weight to calculate BMI