Body Mass Index (BMI)
Find out if your weight is in a healthy range for your height. This professional calculator supports both metric and imperial measurements.
What is BMI?
BMI stands for Body Mass Index. It is a simple index of weight-for-height that is commonly used to classify underweight, overweight, and obesity in adults and children.
Is BMI calculated differently for children?
Yes. While the basic formula is the same, children and teens are still growing, so their BMI is interpreted using age and sex-specific percentiles. This calculator provides results for adults (men and women).
What are the BMI categories for adults?
According to the WHO: Underweight (< 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (≥ 30).
How accurate is BMI as a health indicator?
BMI is a useful screening tool but does not measure body fat directly. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults with low muscle mass.