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Our free BMI calculator is a quick and easy tool to calculate your Body Mass Index (BMI) and understand your weight category. BMI is a widely used measurement to assess whether a person has a healthy body weight for their height.

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on height and weight. It's calculated by dividing a person's weight in kilograms by the square of their height in meters (kg/m²). BMI provides a reliable indicator of body fatness for most people and is used to screen for weight categories that may lead to health problems.

How to Use the BMI Calculator:

1. Choose your preferred unit system (Metric or Imperial)
2. Enter your weight (in kg or lbs)
3. Enter your height (in cm or inches)
4. Click "Calculate My BMI" button
5. View your BMI result and health category

BMI Categories:

• Underweight: BMI less than 18.5 - May indicate malnutrition or other health issues
• Normal Weight: BMI 18.5 - 24.9 - Indicates a healthy weight range
• Overweight: BMI 25 - 29.9 - May increase risk of health problems
• Obese: BMI 30 and above - Significantly increases health risks

Important Notes:

While BMI is a useful screening tool, it has limitations. It doesn't directly measure body fat and may not be accurate for athletes, pregnant women, the elderly, or people with certain body compositions. Always consult with a healthcare professional for personalized health advice.

100% Free & Private

This BMI calculator is completely free to use with no registration required. Your data is processed locally in your browser and never uploaded to any server.