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How To Calculate Your BMI :A Comprehensive Guide

how to calculate your bmi

Understanding the health metrics that pertain to you is an important aspect of personal health management. One such critical measurement is the Body Mass Index (BMI). Despite being a simple calculation, it is a vital health indicator used globally by medical professionals. This blog aims to break down the concept of BMI, illustrating how you can calculate and interpret it to better comprehend your health status.

Understanding and Calculating Your BMI: A Comprehensive Guide

What is BMI?

Body Mass Index (BMI) is a numeric measure that offers a rough indication of whether an individual has a healthy body weight for a given height. It was first introduced in the 19th century by a Belgian mathematician named Lambert Adolphe Jacques Quetelet. BMI is widely used across the globe due to its simplicity and ability to assess health risks related to body weight.

It’s important to note that while BMI is a useful screening tool, it doesn’t directly measure body fat percentage. It doesn’t differentiate between weight from muscle mass and weight from fat. Therefore, it’s only a starting point for identifying potential weight-related health problems.

Calculating Your BMI

The formula for calculating BMI is straightforward:

BMI = weight(kg) / [height(m)]^2

For those using Imperial measurements (pounds and inches), the formula adjusts slightly:

BMI = [weight(lbs) / [height(in)]^2] * 703

Let’s walk through an example. If you weigh 70 kg and your height is 1.75 m, you would calculate your BMI as follows:

BMI = 70 kg / (1.75 m)^2 = 22.86

Using the Imperial system, if you weigh 155 pounds and your height is 68 inches, you would calculate your BMI this way:

BMI = [155 lbs / (68 in)^2] * 703 = 23.57

Understanding Your BMI

Once you’ve calculated your BMI, it’s crucial to understand what the number means. The World Health Organization (WHO) provides the following standard BMI classifications:

  • Below 18.5: Underweight
  • 18.5 – 24.9: Normal weight
  • 25.0 – 29.9: Overweight
  • 30.0 and above: Obesity

Using these classifications, a person with a BMI of 22.86 or 23.57 would be considered to have a normal weight.

However, these categories should be interpreted with caution. They do not consider factors such as muscle mass, bone density, or distribution of fat. For instance, an athlete with significant muscle mass may have a higher BMI but be in excellent health. Similarly, older adults typically have more body fat than younger adults with the same BMI.

The Importance of BMI

BMI is used as a screening tool to flag potential weight problems in adults. It is not meant to be a diagnostic tool. Medical professionals conduct further assessments, considering factors like diet, physical activity, family history, and other health screenings when you decide it calculate your bmi.

High BMI (overweight or obesity) is associated with an increased risk of chronic diseases like heart disease, type 2 diabetes, high blood pressure, and certain types of cancer. On the other hand, a low BMI (underweight) may increase the risk of malnutrition, osteoporosis, anemia, and a weakened immune system.

Limitations of BMI: calculate your BMI

While BMI is a valuable tool for identifying general weight categories, it does have its limitations:

It doesn’t consider age, sex, or bone structure: Older people, on average, tend to have more body fat than younger adults with the same BMI. Men typically have less body fat than women with the same BMI. Moreover, people with larger bone structures may weigh more, despite having a normal level of body fat.

It doesn’t factor in lifestyle and genetics: Your overall health cannot be determined by BMI alone. A comprehensive health assessment should also include lifestyle and genetic factors.

Beyond BMI: Additional Health Metrics

Given these limitations, it’s crucial to consider additional health metrics alongside how to calculate you BMI. These may include:

  • Waist-to-hip ratio (WHR): This metric measures the distribution of body fat. A higher WHR indicates that you carry more weight around your waist, which can increase your risk of health conditions like heart disease and type 2 diabetes.
  • Body fat percentage: This is the proportion of your total body weight that’s composed of fat. Unlike BMI, it differentiates between fat and muscle mass.
  • Waist circumference: This measurement helps assess abdominal fat. Excessive abdominal fat is a risk factor for conditions such as type 2 diabetes, heart disease, and certain types of cancer.

Taking Action: calculate your BMI

Understanding your BMI and how it fits into your overall health picture is the first step towards taking action. If your BMI falls outside the “normal” range, consider consulting with a healthcare provider. They can provide personalized advice and help you create a plan to improve your health, which might include diet changes, physical activity, or other interventions.

Remember, the ultimate goal is not just to reach a “normal” BMI but to lead a healthy and balanced lifestyle. Regular physical activity and balanced nutrition are key, regardless of where your BMI falls.


Calculating and understanding your BMI is a powerful first step towards comprehending your health status. Although it has its limitations, it provides a good starting point. Use it in combination with other health indicators and professional advice to guide your health decisions.

Remember, health is a journey, not a destination. Understand your body, keep track of your progress, and, most importantly, seek to make long-term, sustainable changes that prioritize your well-being above all else.

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    Men’s Fit Club was started with the goal of empowering men to get the most out of their lives. This meant going beyond exercise and diet tips to really address the broad range of issues that men face on a daily basis – topics like recreation, finding love, sexual health and even sound fashion advice.