BMI Calculator - Check Your Body Mass Index Online

Understanding BMI Calculator

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared. Our BMI calculator makes this calculation effortless.

How to Use the BMI Calculator

Using our BMI calculator is straightforward:

Enter your weight (in kg or lbs)
Enter your height (in cm, meters, feet, or inches)
Click "Calculate" to get your BMI value
The calculator will also show which BMI category you fall into

BMI Categories

BMI values are generally categorized as follows:

Under 18.5 - Underweight
18.5 to 24.9 - Normal weight
25 to 29.9 - Overweight
30 to 34.9 - Obesity class I
35 to 39.9 - Obesity class II
40 and above - Obesity class III

Limitations of BMI

While BMI is a useful tool, it has some limitations to be aware of:

Muscle vs. Fat

BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have a high BMI but low body fat.

Different Body Types

BMI doesn't account for differences in body composition between genders, age groups, and ethnicities.

Other Factors

BMI doesn't consider factors like bone density, muscle mass, or distribution of fat.

When to Consult a Healthcare Professional

While our BMI calculator provides a good starting point, it's always best to consult with a healthcare professional for personalized advice. This is particularly important if:

Your BMI falls into the underweight or obese categories
You've experienced significant weight changes recently
You have existing health conditions
You're pregnant, elderly, or an athlete

Our BMI calculator is designed as an educational tool to help you understand your body mass index. It's not intended to replace professional medical advice, diagnosis, or treatment.