WHO BMI Calculator
Official Health Guidelines
WHO Health Report
BMI Score
0
Weight Category
Healthy Range
18.5 - 24.9
WHO BMI Classification
| BMI Range | Category | Health Risk |
|---|---|---|
| < 16.0 | Severe Thinness | High risk of nutritional deficiencies |
| 16.0 - 16.9 | Moderate Thinness | Increased health complications |
| 17.0 - 18.4 | Mild Thinness | Moderate health risk |
| 18.5 - 24.9 | Normal Range | Lowest health risk |
| 25.0 - 29.9 | Overweight | Increased risk |
| 30.0 - 34.9 | Obese Class I | High risk |
| 35.0 - 39.9 | Obese Class II | Very high risk |
| ≥ 40.0 | Obese Class III | Extremely high risk |
WHO Health Recommendations
Underweight (BMI < 18.5)
- Gradual weight gain through balanced nutrition
- Increase protein intake (1.2-1.5g/kg body weight)
- Resistance training to build muscle mass
- Regular medical check-ups
Normal Weight (18.5-24.9)
- Maintain current weight through balanced diet
- 150-300 minutes moderate exercise weekly
- Limit saturated fats to <10% of total energy intake
- Regular health screenings
Overweight (25.0-29.9)
- 5-10% weight loss for health improvements
- Reduce energy intake by 500-750 kcal/day
- Increase physical activity to 300 minutes/week
- Limit sugar intake to <25g/day
Obesity (≥30.0)
- Medical supervision for weight management
- Combination of diet, exercise, and behavioral therapy
- Consider pharmacological treatment if BMI ≥30 or ≥27 with comorbidities
- Bariatric surgery for BMI ≥40 or ≥35 with comorbidities
📌 Disclaimer
The results provided by this calculator are for informational and educational purposes only and should not be considered as medical advice, diagnosis, or treatment. Always consult with a qualified healthcare professional before making any health-related decisions. This tool is designed to support, not replace, professional medical guidance. The creators of this tool are not responsible for any health issues or outcomes resulting from its use.