Body Mass Index Calculator.
Calculate your Body Mass Index (BMI) and find your weight category. Understand ideal weight bounds and associated clinical health profiles.
Your BMI Results.
Your Body Mass Index (BMI) compares your body weight to your height according to WHO clinical standards.
24.7
NormalA BMI between 18.5 and 24.9 is considered optimal according to clinical guidelines.
| BMI Range | Classification | Health Risk Profile |
|---|---|---|
| Below 18.5 | Underweight | Nutrient deficiency risk |
| 18.5 – 24.9 | Normal Weight | Optimal, lowest risk |
| 25.0 – 29.9 | Overweight | Moderate metabolic risk |
| 30.0 and Above | Obese | Elevated health risk |
What is Body Mass Index (BMI)?
**Body Mass Index (BMI)** is a simple, internationally recognized tool used to estimate if a person has a healthy amount of body weight relative to their height. BMI is used as a screening tool to classify individuals into underweight, normal weight, overweight, or obese ranges.
The formula for calculating BMI is:
BMI = weight (kg) ÷ [height (m)]²
World Health Organization (WHO) BMI Classifications
For adults 20 years and older, BMI is classified into the following standardized categories:
| BMI Range | Category | Health Risk Profile |
|---|---|---|
| Below 18.5 | Underweight | Nutrient deficiency, osteoporosis risk |
| 18.5 – 24.9 | Normal Weight | Optimal, lowest cardiovascular risk |
| 25.0 – 29.9 | Overweight | Moderate risk for metabolic disease |
| 30.0 and Above | Obese | High risk for type-2 diabetes and hypertension |
Crucial Limitations of BMI
While BMI is a useful population screening tool, it has a major limitation: **it does not distinguish between muscle mass and fat tissue**.
Muscle tissue is significantly denser than fat (occupying 4x less volume for the same mass). As a result, bodybuilders, athletes, and individuals with high muscle mass can register as "overweight" or "obese" according to BMI, despite having extremely low body fat percentages. It is always best to pair BMI measurements with a **Body Fat Percentage** or **Waist-to-Height ratio** for a complete picture.