BMI Calculator

BMI Calculator — Body Mass Index

Calculate your Body Mass Index (BMI) to understand your weight category. BMI is the most widely used screening tool for body fat estimation based on height and weight.

BMI Formula

BMI = weight(kg) / height²(m) — A simple ratio that has been used for over 150 years in medical and health contexts.

WHO BMI Categories

• Below 18.5: Underweight — may indicate nutritional deficiency or underlying health conditions
• 18.5–24.9: Normal healthy weight — associated with lowest health risks
• 25.0–29.9: Overweight — increased risk for cardiovascular diseases
• 30.0 and above: Obesity — significant health risk; consult a healthcare provider

How to Use

1. Enter your height in centimeters (e.g., 170 for 1.70m)
2. Enter your weight in kilograms (e.g., 70)
3. Click Calculate to see your BMI and category

Important Limitations

BMI does not distinguish between muscle and fat. Athletic individuals may have elevated BMI scores despite being healthy. BMI also varies by ethnicity — some populations face health risks at lower thresholds. Always consult a healthcare professional for personalized advice.