A healthy body mass index (BMI) range is considered to be between 18.5 and 24.9. This range indicates that an individual has a normal weight, which is associated with lower risks of chronic diseases such as diabetes and heart disease. A BMI below 18.5 is classified as underweight, while a BMI between 25 and 29.9 is considered overweight. Any BMI of 30 or above categorizes an individual as obese, which can lead to various health complications. Maintaining a BMI within the recommended range supports overall health and well-being.