What Is BMI and What Does It Mean?
BMI (Body Mass Index) is a simple calculation using your height and weight to estimate whether you are in a healthy weight range. It is calculated by dividing your weight in kilograms by the square of your height in meters. BMI is widely used by healthcare providers as a quick screening tool for weight-related health risks.
While BMI is a useful general indicator, it has limitations. It does not distinguish between muscle and fat — a muscular athlete may have a high BMI despite having very low body fat. It also does not account for age, sex, or where fat is distributed on your body. Always discuss your BMI results with a healthcare provider for a complete health assessment.
Healthy Weight for Your Height
For a person who is 5'9" tall, a healthy weight range is approximately 125-168 pounds (BMI 18.5-24.9). At 5'5", the healthy range is 111-149 pounds. At 6'0", it is 140-188 pounds. Use our BMI calculator to find your specific healthy weight range based on your exact height.
BMI Questions Answered
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations for certain groups. It tends to overestimate body fat in muscular people like athletes and bodybuilders. It may underestimate body fat in older adults who have lost muscle mass. Results can also vary by ethnicity — some Asian populations face higher health risks at lower BMI values than Western populations. Use BMI as one indicator among many, not as a definitive health diagnosis.
What is a healthy BMI for adults?
For adults 20 and older, a BMI of 18.5-24.9 is considered normal or healthy weight. Below 18.5 is underweight. 25.0-29.9 is overweight. 30.0 and above is obese. These categories are the same for both men and women. Children and teenagers use age and sex-specific BMI charts because healthy weight ranges change as kids grow.
How can I lower my BMI?
To lower your BMI, you need to reduce body weight through a combination of reduced calorie intake and increased physical activity. Aim for a moderate calorie deficit of 300-500 calories below your daily needs. Include both cardio exercise and strength training. Focus on sustainable lifestyle changes rather than extreme diets — slow, steady weight loss of 0.5-1 pound per week is healthiest.