BMI Calculator: Understanding Your Body Mass Index
February 25, 2026
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What is BMI?
Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m². While not a perfect measure of health, it provides a useful screening tool.
BMI Categories
- Underweight: Below 18.5
- Normal weight: 18.5–24.9
- Overweight: 25–29.9
- Obese Class I: 30–34.9
- Obese Class II: 35–39.9
- Obese Class III: 40 and above
Limitations of BMI
BMI does not account for muscle mass, bone density, age, sex, or ethnicity. Athletes often have high BMI due to muscle mass, not fat. Similarly, elderly people may have a normal BMI but high body fat percentage.
Healthy Lifestyle Tips
Maintaining a healthy BMI involves balanced nutrition, regular physical activity (at least 150 minutes of moderate aerobic activity per week), adequate sleep, and stress management.