Free Online Body Mass Index (BMI) Calculator

Our easy-to-use BMI Calculator helps you quickly determine your Body Mass Index—a key screening tool used by healthcare professionals to assess weight categories. Whether you are monitoring your health, planning a diet, or just curious, this tool provides instant results based on your height and weight.

How to Use This BMI Calculator

Enter Your Weight: Input your current weight in kilograms (kg).
Enter Your Height: Input your height in centimeters (cm).
View Your Result: The calculator instantly computes your BMI and highlights your category (Underweight, Normal, Overweight, or Obese).

Understanding BMI Categories

Underweight: BMI less than 18.5
Normal weight: BMI between 18.5 and 24.9
Overweight: BMI between 25 and 29.9
Obesity: BMI of 30 or greater

Why Calculate BMI?

Checking your BMI is a useful first step in evaluating your overall health. While it does not measure body fat directly, it correlates with more direct measures of body fat. Maintaining a BMI within the healthy range is associated with a reduced risk of chronic diseases such as heart disease, type 2 diabetes, and certain cancers.