BMI Calculator

BMI is a widely used screening tool that correlates body weight with height. Underweight (under 18.5) may signal malnutrition or underlying health issues — a doctor's evaluation is recommended. Normal weight (18.5-24.9) carries the lowest health risk and is the target range. Overweight (25-29.9) increases risk of type 2 diabetes and heart disease. Obese (30+) multiplies those risks and is where doctors typically start recommending weight loss intervention. BMI is the weight in kilograms divided by height in meters squared. Remember that BMI doesn't distinguish between muscle and fat — athletes may read higher than their true body fat suggests.

How to Use This Tool

Enter your weight in kilograms.
Enter your height in centimeters.
Click Calculate to see your BMI and category.
Note: BMI is a screening tool, not a diagnostic measure.

The Formula

BMI = Weight (kg) / Height (m)². Underweight: <18.5, Normal: 18.5-24.9, Overweight: 25-29.9, Obese: ≥30.

Why It Matters

You are 5'10" and weigh 185 lbs. Your BMI is 26.6 — in the overweight range. Dropping to 165 lbs brings your BMI to 23.7, right in the normal range. The healthy BMI range for your height is 129-174 lbs.