BMI Calculator
Calculate your Body Mass Index (BMI) for free. Enter weight and height to check if you are underweight, normal, overweight, or obese.
Enter your weight and height
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| ≥ 30.0 | Obese |
How It Works
- Enter your weight in kilograms.
- Enter your height in centimetres.
- Your BMI score and category (Underweight / Normal / Overweight / Obese) appear instantly.
- Compare your result against the WHO reference table shown below.
Formula
BMI = weight (kg) / height (m)²Example
Input: Weight: 70 kg, Height: 175 cm
Result: BMI: 22.9 — Normal weight
FAQ
The World Health Organization defines a healthy BMI as 18.5–24.9. Values below 18.5 are underweight; 25–29.9 is overweight; 30 or above is obese.
No. BMI is a simple ratio of weight to height and does not distinguish between fat and muscle. Athletes may score as overweight even when body fat is low.
No. All calculations run in your browser. Your weight and height never leave your device.
This tool uses metric units (kg and cm). To convert: 1 lb ≈ 0.453 kg, 1 inch = 2.54 cm.