BMI Calculator
Body Mass Index (BMI) is a simple index of weight-for-height that is commonly used to classify underweight, overweight and obesity in adults.
- Free Online Tool
- Instant Results
- Mobile Friendly
- No Installation
- Secure & Private
Understanding This Calculator
BMI Formula
The Body Mass Index (BMI) is a simple calculation using a person's height and weight.
BMI = kg / m²
- kg: Weight in Kilograms
- m²: Height in Meters squared
Example 1
Weight = 70 kg, Height = 175 cm (1.75 m).
- Calculation: 70 / (1.75 × 1.75)
- 70 / 3.0625 = 22.86 (Normal)
Example 2
Weight = 90 kg, Height = 170 cm (1.7 m).
- Calculation: 90 / (1.7 × 1.7)
- 90 / 2.89 = 31.14 (Obese)
BMI Reference Table
| BMI Range | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal Weight (Healthy) |
| 25.0 – 29.9 | Overweight |
| 30.0 and Above | Obesity |
Note: BMI is a screening tool, not a diagnostic of body fatness or health.
How to Use
- Enter your weight in kilograms.
- Enter your height in centimeters.
Frequently Asked Questions
Is this medical advice?
No, this tool is for informational purposes only. Always consult a healthcare professional for medical advice.
Is this calculator free to use?
Yes, this calculator is 100% free and does not require any registration or subscription.
Is it mobile-friendly?
Absolutely! Our tool is optimized for all devices, including mobile phones, tablets, and desktop computers.