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A BMI Calculator — also known as a Body Index Calculator or Body Weight Index Calculator — helps you estimate whether your weight is within a healthy range for your height. It’s a simple but effective way to understand how your body weight relates to your overall health. Many people also call it a Body BMI Calculator, and it’s often the first step toward setting realistic fitness or nutrition goals.

BMI stands for Body Mass Index, a measure used globally to categorize individuals as underweight, normal weight, overweight, or obese. It doesn’t diagnose health directly, but it gives a helpful snapshot of your body composition and potential health risks.

Understanding your BMI helps you see the bigger picture of your health — not just how you look, but how your body might be functioning inside. Doctors, nutritionists, and fitness trainers all use BMI as a quick check to gauge your overall wellness and potential risk for conditions like heart disease, diabetes, and high blood pressure.

It’s useful for anyone who wants to track their weight changes, set health goals, or simply know whether they’re moving toward a balanced body composition. For adults, a BMI between 18.5 and 24.9 is generally considered healthy.

The BMI formula compares your weight and height to give a single number that falls into a specific category. The basic formula is:

Once you calculate your BMI, you can interpret it like this:

A simple visualization (like a color-coded bar) showing your result along this scale can help make the result easier to interpret at a glance.