⚖️ BMI Calculator
🔒 No signup, no login — free to use. This tool runs entirely in your browser; your numbers and files never leave your device.
Check your Body Mass Index (BMI) from your weight and height.
What Is BMI?
BMI is a simple number that compares your weight with your height. It is calculated by dividing your weight in kilograms by the square of your height in metres. Doctors and health guides use it as a quick screening tool.
The usual categories are: below 18.5 is underweight, 18.5 to 24.9 is normal weight, 25 to 29.9 is overweight, and 30 or above is obese. These ranges are a guide only. BMI does not measure body fat directly, and it can be less accurate for athletes, children, pregnant women and older people.
If your BMI is outside the normal range, it is a good reason to look at your food, exercise and sleep habits, and to talk to a doctor if you are worried. This tool gives general information only and is not medical advice.