Health & Lifestyle
BMI Calculator
Calculate your Body Mass Index (BMI) using height and weight to assess your health category according to WHO standards.
Your BMI Score
-
Enter details
Complete Body Mass Index (BMI) & Weight Health Guide
Body Mass Index (BMI) is a universally recognized screening metric established by the World Health Organization (WHO) and healthcare institutions globally. It estimates body fat content based on an adult individual's height and total body mass.
Official WHO Weight Classification Table
| BMI Range (kg/m²) | Classification Status | Health Risk Profile |
|---|---|---|
| Less than 18.5 | Underweight | Risk of nutritional deficiency & osteoporosis |
| 18.5 – 24.9 | Normal Weight | Lowest risk of cardiovascular complications |
| 25.0 – 29.9 | Overweight (Pre-obese) | Moderate risk of hypertension & type-2 diabetes |
| 30.0 or higher | Obese (Class I-III) | Elevated cardiovascular & metabolic risks |
The Mathematical Calculation Formula
BMI is computed by dividing a person's weight in kilograms by the square of their height in meters:
$$\text{BMI} = \frac{\text{Weight (kg)}}{\left(\frac{\text{Height (cm)}}{100}\right)^2}$$
Limitations of BMI Measurement
While BMI serves as an excellent general screening tool for large populations, it has notable physiological limitations:
- Athletes & Muscle Density: Muscle tissue weighs more than fat tissue per volume. Bodybuilders may be classified as "overweight" or "obese" despite having very low body fat percentages.
- Age Factors: Elderly individuals naturally lose muscle mass; a slightly higher BMI in senior years can sometimes offer protective health benefits.