BMI Calculator

What is BMI?

Body Mass Index (BMI) is a widely-used measure that helps determine whether a person has a healthy body weight for their height. It is calculated by dividing a person's weight in kilograms by the square of their height in meters.

How to Use This Calculator

Enter your weight in kilograms or pounds, and your height in centimeters or feet and inches. Click "Calculate" to instantly see your BMI result along with your weight category.

BMI Formula

Metric: BMI = weight (kg) / [height (m)]²
Imperial: BMI = 703 × weight (lbs) / [height (in)]²

BMI Categories

• Underweight: BMI less than 18.5
• Normal weight: BMI 18.5 - 24.9
• Overweight: BMI 25 - 29.9
• Obesity: BMI 30 or greater

Limitations

While BMI is a useful screening tool, it does not directly measure body fat or account for muscle mass, bone density, or overall body composition. Athletes with high muscle mass may have a high BMI despite having low body fat.

FAQ

Is BMI accurate for everyone?
BMI is a general indicator and may not be accurate for athletes, elderly individuals, or pregnant women.

How often should I check my BMI?
It's good to check your BMI periodically as part of your overall health assessment, but consult a healthcare provider for personalized advice.