A healthy body mass index (BMI) range for adults is generally considered to be between 18.5 and 24.9. This range indicates a balance between body weight and height, suggesting a healthy body composition. A BMI below 18.5 is classified as underweight, while a BMI between 25 and 29.9 indicates overweight status. A BMI of 30 or above classifies an individual as obese. Monitoring BMI can help assess health risks related to weight.