BMI Calculator
BMI, or Body Mass Index, is a simple calculation using a person's height and weight. This calculator provides BMI and the corresponding BMI weight status category. Use this calculator for adults, 20 years old and older.
| Unit System |
|
| Weight | kg |
| Height | cm |
BMI Chart for Adults
| BMI Range | Category | Health Risk |
|---|---|---|
| Below 18.5 | Underweight | Minimal |
| 18.5 - 24.9 | Normal Weight | Minimal |
| 25.0 - 29.9 | Overweight | Increased |
| 30.0 - 34.9 | Obese Class I | High |
| 35.0 - 39.9 | Obese Class II | Very High |
| 40.0 and above | Obese Class III | Extremely High |
About BMI
Body Mass Index (BMI) is a person's weight in kilograms divided by the square of height in meters. A high BMI can indicate high body fatness. BMI screens for weight categories that may lead to health problems, but it does not diagnose the body fatness or health of an individual.
BMI Formula
Limitations of BMI
BMI is an inexpensive and easy screening method for weight category, but it is not a diagnostic tool. For example, a person may have a high BMI but to determine if excess weight is a health risk, a healthcare provider would need to perform further assessments. These might include skinfold thickness measurements, evaluations of diet, physical activity, and family history.
BMI is not always accurate for:
- Athletes with high muscle mass
- Older adults who have lost muscle mass
- Children and adolescents (different charts apply)
- Pregnant or breastfeeding women
Health Tips
Maintaining a healthy BMI is important for overall health. If your BMI indicates you're overweight or obese, consider consulting with a healthcare provider about healthy ways to lose weight through proper diet and exercise. If you're underweight, focus on gaining weight through nutritious foods and strength training.