Body Mass Index Formula

Let's talk about BMI or Body Mass Index. The BMI is becoming a popular way internationally for measuring healthy body composition. We need a way to track our progress and this is something that anyone can do without seeing a doctor or being immersed in a chamber to test for body fat. Here's how it works:


Multiply your weigh (in pounds) by 704.5

Multiply your height (in inches) by your height (in inches)

Divide the first result by the second.

Example: If you are 5'5" and weigh 140

140 x 704.5 = 98,630

65 x 65 = 4,225

98,630 divided by 4,225 = 23


Multiply your weight (in kilo's) by 10,000

Multiply your height (in cm's) by your height (in cm's)

Divide the first result by the second.


If you're 165 cms and weigh 63.6 kilos

63.6 x 10,000 = 636,000

165 x 165 = 27,225

636,000 divided by 27,225 = 23.4

Using Your Body Mass Index (BMI) Number

Once you have your Body Mass Index (BMI) number look at the table below to determine if you are underweight, normal, overweight or obese.

BMI number
Less than 20
Between 20 and 25
Between 25 and 30
Over 30

Remember your Body Mass Index (BMI) is a starting point. It is best to report your progress as you lose weight/fat on the same day each week by measuring your: Neck, Shoulders, Chest, Upper arms, Waist, Hips, and Thighs.

Measuring your waistline is a simple check. For an accurate measurement:

* Measure directly against your skin

* Breathe out normally.

* Make sure the tape is snug, without compressing the skin.

* The correct place to measure your waist is horizontally halfway between your lowest rib and the top of your hipbone. This is roughly in line with your belly button.

Increased risk of developing a chronic disease

- Men: more than 94 centimetres

- Women: more than 80 centimetres

Greatly increased risk of developing a chronic disease

- Men: more than 102 centimetres

- Women: more than 88 centimetres

NOTE: These are World Health Organisation and National Health & Medical Research Council figures.

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