BMI Calculator
The BMI Calculator is a free online tool that computes your Body Mass Index instantly. Enter your height in centimeters and weight in kilograms to get your BMI score, a weight category rating, a full reference chart of BMI ranges, and practical health tips.
Everything is calculated locally in your browser — your height and weight are never uploaded to any server. The tool is completely free with no sign-up required, making it handy for anyone tracking their weight, fitness enthusiasts, and health professionals needing a quick screening.
How to Use
- Enter your height in centimeters.
- Enter your weight in kilograms.
- Click the Calculate button.
- Review your BMI score, weight category, and the BMI range chart.
FAQ
Is this BMI calculator free to use?
Yes, it is completely free. No registration or login is required, and there are no usage limits.
How is BMI calculated?
BMI equals weight in kilograms divided by height in meters squared. For example, at 1.70 m and 65 kg your BMI is about 22.5. The tool handles the unit conversion for you — just enter centimeters and kilograms.
Which BMI classification standard does the tool use?
It uses the Chinese adult standard: below 18.5 is underweight, 18.5–23.9 is normal, 24.0–27.9 is overweight, and 28.0 or above is obese. These cutoffs are stricter than the WHO standard and better reflect health risks in Asian populations.
Can BMI accurately reflect my health?
BMI is a useful screening indicator, but it cannot distinguish muscle from fat, so it is less meaningful for athletes, pregnant women, seniors, and children. Results are for reference only and are not medical advice — consult a doctor or dietitian if you have concerns.