What Is BMI?
BMI, or Body Mass Index, is a simple calculation that uses your height and weight to estimate whether you fall into an underweight, normal, overweight, or obese range. It's calculated by dividing your weight in kilograms by the square of your height in meters (kg/m²), and it's widely used by doctors as a quick first-pass indicator of general health risk.
BMI Categories
| BMI Range | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25.0 – 29.9 | Overweight |
| 30.0 and above | Obese |
Why BMI Matters
- It offers a fast, free way to screen for weight categories linked to health risk.
- Doctors often use it as a starting point before ordering more detailed tests.
- Tracking it over time can help you notice gradual changes in your weight trend.
Limitations to Keep in Mind
BMI doesn't distinguish between muscle and fat, so very muscular people may show a higher BMI without extra body fat. It also doesn't account for age, sex, or where fat is distributed on the body. Use it as a general guide, not a diagnosis.