Body Mass Index, or BMI, is a measurement that helps to determine whether a person has healthy body weight or not. It is calculated based on an individual’s height and weight and is widely used as a preliminary method to determine if a person is underweight, overweight, or has a healthy weight. In this article, we will guide you through the steps of calculating BMI, its importance, interpretation of scores, the limitations and provide an understanding of how useful it can be for weight loss and good health maintenance.

Step-by-step guide on how to Calculate BMI

The first step in calculating BMI is to measure your height and weight correctly. When measuring your weight, stand still on a flat surface, and remove any heavy clothing or shoes. Use a reliable bathroom scale to weigh yourself and make sure to record the number correctly.

To measure your height: stand straight with your feet flat, back erect and bare feet touching the floor, use a wall-mounted measuring tape. Place the measuring tape against the wall, and make sure it is straight. Start at the bottom of the tape and measure your height up to the top of your head. Record this number correctly.

The formula used to calculate BMI is:

BMI = weight(kg) / height²(m²)

Here’s how to calculate BMI: divide your weight by your height in meters squared. For example, if you weigh 70 kg and your height is 1.72 m, the calculation is as follows:

BMI = 70 / (1.72 x 1.72)

BMI = 23.7

Importance of BMI

Calculating BMI is significant in determining the health status of an individual, especially when it comes to weight management. High or low BMI scores can indicate increased risks of developing health issues. Health experts have, over time, confirmed a connection between high BMI scores and certain health conditions like heart disease, diabetes, and cancers, amongst others. BMI is an effective screening tool that helps people to prevent future health issues and make necessary changes to their lifestyle.

Having a healthy weight is pivotal not only to beauty but also to overall well-being. A healthy BMI score translates to an appropriate body fat percentage, which helps in reducing the risk of developing health issues and diseases.

BMI Calculators

Online BMI calculators and apps are readily available and are simplified methods of calculating BMI. These tools make the process less complicated and more efficient since all you have to do is enter your weight and height into the calculator, and the BMI score is provided immediately. These apps, like ‘BMI Calculator’ or ‘BMI Tracker’, enable individuals to track their BMI over time and set goals towards weight management.

The advantages of using BMI calculators include:

  • Efficiency: Using these tools eliminates the need for manual calculations and reduces the margin for error.
  • Accuracy: Using updated calculations and formulas, online calculators provide more accurate results, especially when compared to traditional methods.
  • Availability: These calculators are available easily on mobiles phones, tablets, and computers, which facilitates the process of tracking BMI scores.

Interpreting BMI Scores

The BMI score range signifies an individual’s body weight status based on their height and weight. BMI categories are created by the World Health Organisation; they are:

  • Underweight = < 18.5
  • Normal weight = 18.5 – 24.9
  • Overweight = 25–29.9
  • Obesity = BMI of 30 or greater

The categories highlight different stages of body weight that ultimately help interpret the scores and aid in determining which adjustments need to be made. For example, an individual with a BMI score of 22 falls under ‘normal weight’. On the other hand, a person with a BMI of 34 is classified as ‘obese’ and at high risk of developing health issues like heart disease and diabetes.

Individuals with an overweight BMI score can make lifestyle changes such as exercising and eating healthy to promote weight loss. It is crucial to understand one’s category and how to work towards achieving a healthy weight and maintaining it over time.

The Limitations of BMI

Admittedly, BMI has its limitations that diminish its accuracy as a measure of overall health and fitness. For instance, BMI does not consider variables like muscle mass, which means that muscular athletes who weigh more but are lean could be incorrectly classified as overweight. Additionally, factors such as body type, sex, and age can also cause discrepancies in the accuracy of BMI calculations. Furthermore, since BMI measures total body weight and does not differentiate between the weight of body fat and lean muscle, it may not be a very effective gauge of health in some cases and may suggest obesity when in reality, the individual has a healthy amount of lean muscle mass.

Alternative health-indicators to BMI include waist circumference, body fat percentage, bioelectrical impedance analysis, and dual-energy x-ray absorptiometry, amongst others. These measurement methods provide a more specific outlook on body composition.


Body Mass Index is an essential tool in determining body weight status and promoting overall health and well-being. By following the step-by-step guide, you can accurately calculate your BMI score and take action to maintain a healthy weight. Understanding your BMI score, interpreting it properly, and taking appropriate actions to ensure good health are important and necessary steps in living a happy and healthy life. Remember that BMI may not always be the most accurate measure of good health, and alternative indicators should be considered, but it’s always a good place to start.

By Riddle Reviewer

Hi, I'm Riddle Reviewer. I curate fascinating insights across fields in this blog, hoping to illuminate and inspire. Join me on this journey of discovery as we explore the wonders of the world together.

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