- Choose units — Metric (kg/cm) or Imperial (lbs/ft).
- Enter weight and height.
- Click Calculate to see your BMI, category, and healthy weight range.
- Review the visual scale showing where your BMI falls.
What Is the BMI Calculator?
The BMI Calculator is a free tool for calculating your Body Mass Index — a widely used measure of body weight relative to height. Enter your weight and height in metric or imperial units, and instantly see your BMI value, weight category, and healthy weight range. A visual color-coded scale shows exactly where your BMI falls.
Key Features
- Metric & Imperial — Switch between kg/cm and lbs/feet with one click.
- Visual BMI Scale — Color-coded gradient bar with animated marker showing your BMI position.
- Category Classification — Underweight, Normal, Overweight, Obese (Classes I-III).
- Healthy Weight Range — Shows the ideal weight range for your height.
- Medical Disclaimer — Reminds users that BMI is a screening tool, not a diagnosis.
- 5-Language Support — English, Arabic, Spanish, Portuguese, Chinese.
- 100% Client-Side — No data is sent to any server.
How BMI Is Calculated
BMI = weight (kg) ÷ height (m)². For example, a person weighing 70 kg and 175 cm tall has a BMI of 70 ÷ (1.75)² = 22.86 (Normal Weight).
BMI Categories
| BMI Range | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight |
| 25 – 29.9 | Overweight |
| 30 – 34.9 | Obese (Class I) |
| 35 – 39.9 | Obese (Class II) |
| ≥ 40 | Obese (Class III) |
Privacy & Security
This tool runs 100% in your browser. No health data is ever sent to a server.