| Category | BMI |
|---|---|
| Underweight | < 18.5 |
| Healthy | 18.5 – 24.9 |
| Overweight | 25 – 29.9 |
| Obesity | 30+ |
What is BMI?
BMI (Body Mass Index) is a simple measurement that estimates whether your weight is healthy based on your height. It is widely used by health professionals to classify weight categories such as underweight, normal weight, overweight, and obesity.
Our BMI Calculator helps you calculate your body mass index quickly and accurately.
How to Use the BMI Calculator
Using our body mass index calculator is very easy:
Enter your height (cm or feet/inches)
Enter your weight (kg or pounds)
Click the calculate button
The tool instantly shows your BMI result along with your weight category.
BMI Formula (How BMI is Calculated)
The standard BMI formula is:
BMI = weight (kg) ÷ height² (m²)
Example:
Weight: 70 kg
Height: 1.75 m
BMI = 70 ÷ (1.75 × 1.75)
BMI = 22.9
Our free BMI calculator online automatically performs this calculation for accurate results.
BMI Categories & Chart
Here is the standard BMI classification:
Below 18.5 → Underweight
18.5 – 24.9 → Normal weight
25 – 29.9 → Overweight
30 and above → Obese
This BMI chart helps determine whether your body weight is within a healthy range.
Why BMI is Important
Knowing your BMI helps you:
✔ Understand your health risk level
✔ Plan weight loss or muscle gain
✔ Track progress over time
✔ Improve overall fitness
For complete health tracking, also try our:
Limitations of BMI
While the BMI calculator is useful, it has some limitations:
It does not measure body fat percentage directly
It does not differentiate between muscle and fat
Athletes may have high BMI but low body fat
For more detailed analysis, use our Advanced Body Fat Calculator.
Benefits of Using Our BMI Calculator
Instant results
Free and mobile-friendly
Accurate formula-based calculation
Simple and easy to use
Helpful for fitness planning
Frequently Asked Questions (FAQs)
Q1: What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy.
Q2: Is BMI accurate?
BMI provides a general estimate but does not measure body fat directly.
Q3: Can BMI help with weight loss?
Yes, it helps determine whether you need to lose, gain, or maintain weight.
Q4: Is this BMI calculator free?
Yes, it is completely free and easy to use online.