Use this free online BMI calculator to check your Body Mass Index from your weight and height in seconds. Simply enter your weight in kilograms and height in centimeters to see which BMI category you fall into. This tool is for general informational purposes only and is not a substitute for professional medical advice.
How to Use the BMI Calculator
Enter your weight in kilograms in the "Weight (kg)" field.
Enter your height in centimeters in the "Height (cm)" field.
Click "Calculate BMI" to view your BMI value and category instantly.
Frequently Asked Questions
BMI is calculated by dividing your weight in kilograms by the square of your height in meters (BMI = weight ÷ height²). This calculator converts your height from centimeters to meters automatically before applying the formula.
A BMI below 18.5 is classified as Underweight, 18.5-24.9 as Normal, 25-29.9 as Overweight, and 30 or above as Obese. These ranges are general population guidelines and may not apply to athletes, children, or pregnant women.
If the weight or height field is left blank, zero, or negative, the calculator displays an "Invalid input!" message and asks you to enter valid values instead of showing a BMI result.
Yes, this BMI calculator is completely free with no sign-up required. However, it provides a general estimate only and is not a medical diagnosis - consult a healthcare professional for a full assessment of your health.