According to the World Health Organization (WHO), people with a BMI >25 kg/m2 are considered to be overweight, and people with a BMI >30 kg/m2 have obesity. Obesity is a treatable disease associated with excess weight. Obesity can be caused by multiple factors including genetics, appetite signals/hormones, environment, and behavior. Being considered overweight or having obesity can't be determined by the number you see on a scale. To do this, you need to calculate your BMI using your height and weight. Use a BMI calculator to determine your current BMI, which can be a starting point in discussing weight-management options with your health care provider.