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Understanding Body Mass Index (BMI)

In this blog post, I am going to define what is Body Mass Index, how it is calculated, categories, limitations, and how you can use this to reach your weight loss goals.

What is BMI?

Body Mass Index (BMI) is a measure of body fat based on weight and height that applied to adult men and women.

How to calculate BMI?

BMI is a person´s weight in kilograms divided by square of height in meters.

Understanding Body Mass Index (BMI)


For example, if you weight 70Kg and you’re 170Cm which is 1.7 meters you will have a BMI of 24.22, in the next section we will see what this number means.

But you don’t need to do this calculation manually, you can use a BMI web-based calculator by clicking the following link.


Also, there are many apps that can help you to calculate BMI, just search for BMI calculator on your apps store and you will find many options.

BMI categories

So now you calculated your BMI and you got the magic BMI number, so let us see what it means.

Underweight (<18.5)

If your BMI is less than  18.5, this means you’re underweight, this is a serious health problem and my recommendation is that you should go and see a nutritionist.

Normal Weight ( between 18.5 and 24.9)

If you’re BMI is between 18.5 and 24.9 congratulations, you’re a normal weight, the only thing you have to do is to make sure that it stays that way.

Overweight (between 25 and 29.9)

If your BMI score is between 25 and 29.9, you’re overweight, if you follow advice from this blog you should be able to lose weight and go back to your normal weight again.

Obesity (Over 30)

If your BMI score is more than 30, you´re overweight and you run a risk of having diseases related to being obese like heart diseases, I will not you to recommend doing exercises or starting your weight loss journey without seeing a professional (a doctor or nutritionist).

Important note about BMI score.

Your BMI score does not tell you where you have body fat, which is important in order to analyze the health risks, that is why the circumference of your waist.

If your waist circumference is greater than 88cm in women and more than 102 cm in men, you run a risk of having major heart diseases, diabetes, and other health problems.

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