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February 6, 2013 at 11:43 AMComments: 2 Faves: 0

BMI Formula: Weight over Height Squared

By Cornelius Bounds, CPT More Blogs by This Author

Becoming more knowledgeable about fitness and exercise will accelerate your personal fitness goals. To truly understand your results, having the right tools is necessary.

Know Your BMI

The benefits of knowing your BMI are extensive... So, What is BMI?  BMI (Body Mass Index) is a guide, assessment, or number arrived at by assessing a person's height and weight to better understand  a person's body composition, which correlates to possible health risk and health outcomes. The results are very clear (the higher the BMI= increased health risk). For fitness beginners, knowing your BMI gives you a better understanding of your body's composition. Instead of going to the gym and randomly doing exercises on your own, your BMI allows you to make necessary tweaks to your fitness regimen, better modify your workouts, and increase chances of a healthier lifestyle. Knowing your BMI also helps individuals zero in on certain areas of the body that may require a little more attention.

It's Simple Math!

There are many ways to convert or calculate your BMI. A common method is dividing your weight in Kilo's (kgs) and your height by meters squared. Another conversion method is to take your weight in pounds, divided by height in inches square, multiplied by 704.5 (weight (lbs)/ height (in) 2) x 704.5 = BMI

BMI below 18.5 = underweight
BMI between 18.5 -- 24.9 = Normal weight
BMI between 24.9 -- 29.9 = Overweight
BMI of 30 and greater = Obese
BMI of 40 and greater = Morbidly Obese

Keep in mind, 60-70% of achieving your fitness goals take place outside the gym - bad dieting habits, sleep cycles, etc. A personal trainer should give you tips to help alleviate some of those inconsistencies and bad habits.

The results or BMI interpretations are the same for men and women. Though the BMI has its imperfections, its advantages will help control unwanted body fat and keep extra weight at bay. If your BMI levels are too high or too low, consult a nutritionist for guidance.

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2 Comments

  • I assume this only applies to body Fat? What if you weight 230lb and you're 6'0', but you only have 2% body fat for instance?

    Still this is good info considering I'm not in the situation I described sadly.

  • Thanks Garchow,
    I get this one a lot...

    BMI scores are reliable, valid, but inherits limitations. One of the limits includes the accuracy of more muscular individuals. Muscle is denser than fat, essentially muscle weighs more than fat. For more muscular individuals, using BMI assessments may over estimate your overall body fat percentage. There are alternative methods of measuring body fat other than BMI and are more accurate: One being a skinfold test with a caliper and underwater weighing.

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