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How to Calculate BMI? Formula, Chart & Healthy BMI Range (2026 Guide)

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BMI, or Body Mass Index, is a simple method used to check whether a person has a healthy body weight based on height and weight.

In this guide, you’ll learn how to calculate BMI, understand BMI categories, and know why BMI is important for health.

BMI (Body Mass Index) is calculated by dividing weight in kilograms by height in meters squared.

BMI calculation concept showing body mass index chart healthy weight measurement and fitness scale

BMI helps estimate whether a person’s weight is healthy for their height.

What is BMI?

Body Mass Index (BMI) is a health measurement that estimates body fat based on height and weight.

Doctors and fitness experts often use BMI to identify weight categories such as underweight, normal weight, overweight, and obesity.

BMI Formula

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

How to Calculate BMI Step-by-Step

Step 1: Measure Your Weight

Check your body weight in kilograms (kg).

Step 2: Measure Your Height

Measure your height in meters (m).

Step 3: Square Your Height

Multiply your height by itself.

Step 4: Divide Weight by Height Squared

Use the BMI formula to calculate your result.

BMI Categories

BMI Range Category
Below 18.5 Underweight
18.5 – 24.9 Normal Weight
25 – 29.9 Overweight
30 or Above Obesity

Why BMI is Important

  • Helps monitor body weight
  • Identifies obesity risks
  • Supports fitness goals
  • Useful for general health assessment

Limitations of BMI

BMI does not directly measure body fat or muscle mass. Athletes and muscular individuals may have higher BMI values without excess body fat.

Tips to Maintain Healthy BMI

  • Eat balanced meals
  • Exercise regularly
  • Stay hydrated
  • Get enough sleep
  • Avoid excessive junk food

Conclusion

BMI is a simple and useful tool for checking whether your weight falls within a healthy range. While it may not provide a complete health assessment, it is a helpful starting point for maintaining fitness and wellness.

FAQs About BMI

1. What does BMI stand for?

BMI stands for Body Mass Index.

2. How is BMI calculated?

BMI is calculated using weight and height.

3. What is a healthy BMI range?

A healthy BMI range is usually between 18.5 and 24.9.

4. Is BMI always accurate?

No, BMI does not directly measure body fat or muscle mass.

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