BMI Calculator – How to Use It

The BMI Calculator is a health assessment tool that helps individuals calculate their Body Mass Index (BMI) based on weight and height, providing insights into whether they fall into the category of underweight, normal weight, overweight, or obese.

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What Is BMI?

BMI (Body Mass Index) is a globally recognized method for evaluating a person’s health status based on their weight relative to height. It’s calculated using the formula: BMI=Weight(kg)Height(m)2BMI = \frac{Weight (kg)}{Height (m)^2}BMI=Height(m)2Weight(kg)​

• A lower BMI may indicate being underweight.
• A higher BMI may suggest overweight or obesity.
• A normal BMI indicates a healthy balance between weight and height.

The BMI Calculator automates this process for you and instantly categorizes your result.

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How to Use the BMI Calculator

Using this calculator is straightforward and only takes a few seconds:

Step 1: Enter Your Weight

• Input your body weight in kilograms.
• Example: 70 kg

Step 2: Enter Your Height

• Input your height in centimeters.
• Example: 170 cm

Step 3: Click “Calculate BMI”

• The calculator will instantly show:
  • BMI Value (e.g., 24.2)
  • Category (e.g., Normal weight)

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BMI Categories

According to the World Health Organization (WHO), BMI is classified as follows:

BMI Range	Category
Below 18.5	Underweight
18.5 – 24.9	Normal weight
25 – 29.9	Overweight
30 and above	Obese

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Example Calculation

Let’s say:

• Weight: 70 kg
• Height: 170 cm

Formula: BMI=701.7×1.7=24.22BMI = \frac{70}{1.7 \times 1.7} = 24.22BMI=1.7×1.770​=24.22

Result:

• BMI Value: 24.22
• Category: Normal weight

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Why Use a BMI Calculator?

• Health Awareness – Helps you understand your weight category.
• Preventive Check – Early indication of potential weight-related issues.
• Fitness Tracking – Monitors progress if you are gaining or losing weight.
• Medical Reference – Used by doctors as a quick screening tool.

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FAQ – BMI Calculator

What is the BMI Calculator used for?

It is used to measure your body weight in relation to your height and determine whether you are underweight, healthy, overweight, or obese.

Is BMI a perfect measure of health?

Not entirely. While BMI is useful, it does not measure body fat percentage, muscle mass, or fat distribution. For athletes or muscular individuals, BMI may overestimate obesity.

What is a healthy BMI range?

The healthy BMI range is 18.5 to 24.9.

Can BMI differ for men and women?

The calculation method is the same for both men and women. However, body composition differences mean two people with the same BMI may have different health risks.

How often should I check my BMI?

You can check it every few months or when your weight changes significantly. For long-term health monitoring, BMI is best used alongside waist-to-hip ratio, cholesterol levels, and fitness assessments.