Normal Weight Ranges: Body Mass Index (BMI)
www.cancer.org › cancer › cancer-causesBMI is often used as a screening tool to decide if your weight might be putting you at risk for health problems such as heart disease, diabetes, and cancer. BMI is used to broadly define different weight groups in adults 20 years old or older. Underweight: BMI is less than 18.5. Normal weight: BMI is 18.5 to 24.9. Overweight: BMI is 25 to 29.9.