How to Calculate Your BMI With a Bigger Frame

Written by sam grover
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How to Calculate Your BMI With a Bigger Frame
Body Mass Index is a calculation of your weight in relation to your height. (Digital Vision./Digital Vision/Getty Images)

Body Mass Index is a calculation of your weight in relation to your height. When it comes to determining whether you are healthy or not, it is a more accurate gauge than weight alone. A taller person might be heavier than a shorter person because of his larger bones and muscles, and BMI takes this into account. However, BMI is a means to estimate -- while it does compensate for height, it can't compensate for frame size or the amount of muscle you have. It is possible to have a high BMI and low body fat by being extremely muscular or a low BMI and be extremely unhealthy by being light but not adequately muscled.

Skill level:
Easy

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Instructions

  1. 1

    Establish whether you have a large frame or not by measuring your wrist's diameter. If you are a woman less than 5 feet 2 inches tall, you have a large frame if your wrist diameter is over 5.75 inches. If you are between 5 feet 2 inches tall and 5 feet 5 inches tall, then your wrist needs to be more than 6.5 inches in diameter to be considered large framed. If you are more than 5 feet 5 inches tall, then your wrist needs to be larger around than 6.5 inches. For men more than 5 feet 5 inches tall, wrist diameter needs to be at least 7.5 inches to be considered large framed.

  2. 2

    Square your height in inches. For example, if you are 6 feet tall, you should multiply the number 72 by itself. This result would be 5,184.

  3. 3

    Divide your weight by the number you arrived at in Step 2. If you weigh 90.7 Kilogram, your result will be 200 divided by 5184, or 0.038580247.

  4. 4

    Multiply the result of Step 3 by 703. The result in this case is just more than 27. The result is your BMI.

  5. 5

    Compare your frame size to your BMI. For a normal-frame person, below 18.5 is underweight, while 18.5 to 24.9 is normal and more than 25 is considered overweight. So, the person in our example here is officially overweight -- but not by much. Since 27 is only 2 more than 25, it is safe to assume that this person is a healthy weight due to his large frame. However, if his BMI was 40 this would be past the margin allowed for a large frame.

Tips and warnings

  • Remember that these are estimates that work on an aggregate basis -- they may not apply to individuals.

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