health ToolUpdated 2026-09-19
BMI Calculator (Body Mass Index)
Calculate your Body Mass Index (BMI) to understand your general weight category according to World Health Organization (WHO) standards.
Important Medical Disclaimer: This health tool is designed solely for informational, screening, and educational purposes. It does not provide medical diagnosis, treatment, or individualized clinical advice. Always consult a qualified physician or healthcare provider regarding any health condition.
Formula & Mathematical Methodology
BMI = Weight (kg) ÷ [Height (m)]²
Divides body weight in kilograms by the square of body height in meters.
How to Use This BMI Calculator (Body Mass Index)
- Enter your weight in kilograms.
- Enter your height in centimeters.
- Click Calculate to view your BMI and category.
Step-by-Step Worked Example
Scenario: 70 kg body weight and 175 cm height
1. Convert height to meters: 175 ÷ 100 = 1.75 m
2. Square height: 1.75 × 1.75 = 3.0625 m²
3. Divide weight: 70 ÷ 3.0625 = 22.86
4. Result is in normal weight range (18.5 – 24.9)
Final Calculated Result: 22.9 BMI (Normal Weight)
What Does Your Result Mean?
Standard categories: Underweight (<18.5), Normal (18.5–24.9), Overweight (25–29.9), Obese (≥30).
Common Practical Applications:
- General health screening
- Fitness goal baseline tracking
Important Limitations & Assumptions:
- BMI does not distinguish between body fat and lean muscle mass. Athletes with high muscle mass may be classified as overweight.
Frequently Asked Questions
Is BMI accurate for muscular people?
BMI can overestimate body fat in muscular individuals because muscle weighs more per volume than fat.
What is a healthy BMI?
According to the WHO, a BMI between 18.5 and 24.9 is considered normal weight for adult men and women.
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