Body Mass Index (BMI) is an important medical tool to assess healthy weight based on height and weight. Learn how to calculate BMI accurately and understand what the results mean for your health.
What is BMI?
Body Mass Index (BMI) is a measurement that uses height and weight to calculate whether your weight is healthy. It was developed in the 19th century and is used by doctors worldwide as an initial indicator to assess healthy weight.
Calculate Your BMI Now
Use our free BMI calculator to accurately calculate your body mass index and get personalized health recommendations.
BMI Calculation Formula
Basic Formula:
BMI = Weight (kg) ÷ (Height (m) × Height (m))
Practical Example:
- Weight: 70 kg
- Height: 1.75 m (175 cm)
- BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.06 = 22.9
- Classification: Normal healthy weight ✓
BMI Classifications
According to the World Health Organization (WHO), BMI is classified as follows:
| BMI Range | Classification | Health Risks |
|---|---|---|
| Below 18.5 | Underweight | Weak immunity, osteoporosis |
| 18.5 - 24.9 | Normal healthy weight | Low risk |
| 25 - 29.9 | Overweight | Moderate risk |
| 30 - 34.9 | Obesity Class I | High risk |
| 35 - 39.9 | Obesity Class II | Very high risk |
| 40 and above | Extreme Obesity (Class III) | Extremely high risk |
Health and Fitness Tools
Conclusion
BMI is a useful tool but not the only one. Use our BMI calculator with calorie calculator for a complete picture of your health.