How to Calculate Body Mass Index Manually

Step-by-step Instructions

Here is what you need to do...
Step 1

All you need to calculate your BMI is your weight and height. You can use pounds and inches, or you can use kilograms and meters.

Step 2

The formula for pounds and inches is: your weight in pounds divided by your height in inches, squared. Then that number gets multiplied by 703. (703 is a set, constant in the formula)

Step 3

The formula for meters and kilograms is: your weight in kilograms divided by your height in meters, squared.

Step 4

Additional Information: The conversion from pounds to kilograms is: pounds multiplied by 2.2 and the conversion from kilograms to pounds is just the opposite-divide kilograms by 2.2 to get pounds. The conversion from meters to inches is: meters multiplied by 39 to get inches. Conversion from inches to kilograms is just the opposite, divide inches by 39 to get meters.

Special Attention

Difficulties people often experience or parts that need special attention to do it right.

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When did you first do this & how did you get started?

BMI has been around since the mid 1800's. Recently it has been researched and is now thought to be a less ideal way to gauge health.

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