BMI Calculator

A BMI (Body Mass Index) Calculator is a simple tool that estimates whether your body weight is in a healthy range relative to your height. It is widely used by healthcare professionals as an initial screening tool to identify potential weight-related health risks.

Formula Used

For example, if your weight is 70 kg and your height is 1.70 m, your BMI = 70 ÷ (1.70 × 1.70) = 70 ÷ 2.89 = 24.2. According to WHO guidelines: Under 18.5 = Underweight, 18.5–24.9 = Normal weight, 25–29.9 = Overweight, 30 and above = Obese.

BMI Categories (WHO Standard)

• Underweight: Below 18.5 — May indicate nutritional deficiency.
• Normal weight: 18.5 to 24.9 — Healthy range for most adults.
• Overweight: 25 to 29.9 — Increased risk of cardiovascular disease.
• Obese Class I: 30 to 34.9 — High risk; lifestyle changes recommended.
• Obese Class II & III: 35 and above — Very high risk; medical advice advised.

How to Use This Calculator

1. Enter your weight in kilograms.
2. Enter your height in centimeters.
3. Click the "Calculate BMI" button to see your BMI value and category.

   Important Notes About BMI

   • BMI is a screening tool, not a diagnostic measure — it does not measure body fat directly.
   • Athletes and muscular individuals may have a high BMI but low body fat.
   • BMI may not be accurate for elderly individuals who may have lost muscle mass.
   • Children and teenagers should use age-specific BMI percentile charts.
   • Always consult a doctor for a comprehensive health assessment.