BMI Calculator - Body Mass Index
Calculate your BMI with metric or imperial units. Visual gauge shows your BMI category instantly.
| 카테고리 | BMI 범위 |
|---|---|
| 저체중 | < 18.5 |
| 정상 체중 | 18.5 – 24.9 |
| 과체중 | 25.0 – 29.9 |
| 비만 | ≥ 30.0 |
What Is a BMI Calculator?
A BMI (Body Mass Index) calculator determines your body mass index by dividing your weight in kilograms by your height in meters squared. BMI is a widely used screening tool to categorize weight status as underweight, normal, overweight, or obese. While BMI doesn't measure body fat directly, it's a useful indicator for general health assessments.
How to Calculate Your BMI
- Choose Unit System — Select Metric (cm/kg) or Imperial (ft-in/lbs)
- Enter Height — Type your height in centimeters or feet and inches
- Enter Weight — Type your weight in kilograms or pounds
- View Results — Your BMI score, category, visual gauge, and healthy weight range appear instantly
Why Use This BMI Calculator?
- Dual Units — Switch between metric and imperial with one click
- Visual Gauge — Color-coded bar shows exactly where your BMI falls
- Healthy Range — See the ideal weight range for your height
- Ponderal Index — Additional metric that accounts for height more accurately
- Privacy — All calculations happen in your browser, no data sent to servers
FreeToolbox vs Other BMI Calculators
| Feature | FreeToolbox | CDC | Calculator.net |
|---|---|---|---|
| Visual Gauge | Yes | No | Yes |
| Dual Units | Yes | Yes | Yes |
| Ponderal Index | Yes | No | No |
| Privacy | Browser-only | Server | Server |
| Ads | Minimal | None | Heavy |
FAQ
What is a healthy BMI range?
A BMI between 18.5 and 24.9 is considered normal weight. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is classified as obese.
Is BMI accurate for athletes?
BMI may overestimate body fat in muscular individuals like athletes, since it doesn't distinguish between muscle and fat mass. Consult a healthcare professional for a comprehensive assessment.
What units does it support?
Both metric (centimeters and kilograms) and imperial (feet, inches, and pounds). Switch between them with one click.
What is the Ponderal Index?
The Ponderal Index (PI) is similar to BMI but divides weight by height cubed instead of height squared, making it more accurate for very tall or very short individuals.
Is my data stored anywhere?
No. All calculations happen locally in your browser. Your height and weight data never leaves your device.