BMI Calculator
Calculate your Body Mass Index (BMI) and find out if you are underweight, normal weight, overweight, or obese. Get your healthy weight range and health risk level instantly.
Calculate Your BMI
What is BMI?
Body Mass Index (BMI) is a measurement that uses your height and weight to estimate if you have a healthy body weight. It is widely used by doctors and health organizations as a quick screening tool.
BMI Formula (Metric): BMI = Weight (kg) ÷ Height (m)²
BMI Categories (WHO Standard)
- Underweight: BMI less than 18.5 — may indicate malnutrition or other health issues
- Normal weight: BMI 18.5–24.9 — healthy range, lower risk of chronic diseases
- Overweight: BMI 25–29.9 — increased risk of health conditions
- Obese Class I: BMI 30–34.9 — high risk
- Obese Class II: BMI 35–39.9 — very high risk
- Obese Class III: BMI ≥ 40 — extremely high risk
BMI Limitations
- BMI does not distinguish between muscle and fat mass — athletes may have high BMI despite being healthy
- BMI doesn't account for fat distribution (waist-hip ratio is also important)
- BMI thresholds may differ for Asian populations (overweight threshold is sometimes 23 for Asians)
- Not suitable for children, pregnant women, or elderly as sole health indicator
- Always consult a doctor for proper health assessment
Healthy Tips Based on Your BMI
- Normal BMI: Maintain with regular exercise (150 min/week) and balanced diet
- Overweight: Reduce calorie intake by 500/day, increase physical activity
- Underweight: Increase calorie-dense nutrient-rich foods, strength training
- Obese: Consult a doctor; structured weight loss program recommended