無料BMI計算機
Enter your height and weight to calculate your Body Mass Index instantly.
Ad Space
Underweight
Normal
Overweight
Obese
Ad Space
How It Works
BMI (Body Mass Index) is calculated as weight in kilograms divided by the square of height in meters: BMI = kg / m². Enter your measurements, press Calculate, and get an instant result with a category classification.
BMI Categories (WHO)
- Underweight · BMI below 18.5
- Normal weight · BMI 18.5 – 24.9
- Overweight · BMI 25 – 29.9
- Obese · BMI 30 and above
Frequently Asked Questions
Is BMI a perfect measure of health?
No. BMI is a simple screening tool based on height and weight. It does not account for muscle mass, bone density, age, sex, or body-fat distribution. Consult a healthcare professional for a complete health assessment.
Does it work for children?
This calculator uses the standard adult BMI formula. Child and teen BMI is age- and sex-specific and requires growth-chart percentile interpretation.
Is my data stored?
No. All calculations run entirely in your browser. Nothing is sent to any server.