What is the normal BMI range for humans?
May 11, 2022
Source: Cainiu Health
Dr. Pan Yongyuan
Introduction
A normal adult BMI ranges from 18.5 to 23.9. A BMI below 18.5 is considered underweight. A BMI of 24–27 is classified as overweight, and a BMI of 28–32 is classified as obese. A BMI exceeding 32 is considered severely obese.
BMI (Body Mass Index) is currently the most widely used international standard for assessing body weight relative to height—and thus evaluating whether an individual is underweight, normal weight, overweight, or obese—and for determining overall health status. By calculating your BMI, you can estimate whether your weight falls within a healthy range. So, what is the normal BMI range for adults?
What Is the Normal BMI Range for Adults?
For adults, a normal BMI falls between 18.5 and 23.9. A BMI below 18.5 suggests underweight; a BMI of 24–27 indicates overweight; a BMI of 28–32 indicates obesity; and a BMI above 32 signifies severe obesity. Currently, BMI is the most commonly used global metric for assessing obesity and health status. However, it is important to note that BMI is generally applicable only to adults and is not suitable for children and adolescents under age 18. Moreover, BMI may not be appropriate for athletes, pregnant or lactating women, or elderly individuals who are bedridden or physically frail.
Another criterion used in diagnosing obesity is “ideal body weight,” calculated as height (in centimeters) minus 100 or 105. Deviations from ideal weight are interpreted as follows: up to ±10% is considered normal; +10% to +20% indicates overweight; and ≥+20% indicates obesity. However, ideal body weight does not reflect regional fat distribution. For assessing fat distribution—particularly abdominal fat—waist circumference is a more relevant indicator. Abdominal obesity is diagnosed when waist circumference exceeds 90 cm in men or 85 cm in women.
Elevated BMI is largely attributable to excessive caloric intake, insufficient physical activity, and low energy expenditure—leading surplus calories to be stored as body fat. Therefore, dietary self-management is essential. We hope this information proves helpful!
