Body mass index (BMI) is a measure of body fat based on height and weight. It is used to screen for weight-related health problems such as obesity and underweight.
BMI can be calculated using the following formula: Weight (kg) / Height (m2). A BMI of 18.5-24.9 is considered normal, a BMI of 25-29.9 is considered overweight, and a BMI of 30 or higher is considered obese.