Body Mass Index (BMI) is a value derived from the mass and height of a person. The BMI is defined as the body mass divided by the square of the body height, and is universally expressed in units of kg/m², resulting from mass in kilograms and height in metres.

For most adults, an ideal BMI is in the **18.5 to 24.9 range.**

If your BMI is less than 18.5, it falls within the **Underweight** range. If your BMI is 18.5 to <25, it falls within **Normal**.

If your BMI is 25.0 to <30, it falls within the **Overweight** range. If your BMI is 30.0 or higher, it falls within the **Obese range.**

Below 18.5 **Underweight**

18.5—24.9 **Normal**

25.0—29.9 **Overweight**

30.0 and Above **Obese**

So, how do you now determine your BMI. Its simple thing to do. You just needs few details to do some petty calculations.

There are 2 ways or let me say methods of calculating your BMI

1. Metric Method

2. Imperial Method

**Metric Method**

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The metric BMI formula accepts height measurements in meters and weight in kilograms. If you know your height in centimeters only, simply divide the number of centimeters by 100 convert it to meters.

For example, a person who is 123cms tall is 1.23m tall (123cm / 100 = 1.23m).

Using the metric formula is even easier than the imperial method as it’s a two step process

Multiply your height by itself.

Divide your weight in kilograms by the value calculated in step 1.

The resulting number is your BMI. Compare this BMI value with the weight status categories above.

E.g. Boffin weighs 50kg and he’s 1.5m tall. He wants to know his BMI.

1. First step is to multiply boffin’s height by itself i.e 1.5 × 1.5 = 2.25²

2. We divide boffin’s weight by his height in meter² we just calculated. Thus; 50/2.25= 22.2

Boffin’s BMI is** 22.2**

If we compare this value to the weight categories listed above, we will find out that his BMI is **Normal**. Now, let’s move to the other method, not as simple and direct as this sha.

**Imperial (US) Method**

The imperial formula accepts height measurements in inches and weight in pounds.

It’s popular in the US where the imperial system is mostly used. Many people know their height in feet and inches, but not in inches only.

If this applies to you, we need to convert your height into inches so we can use it in the equation. There are 12 inches in a foot, so multiply your number of feet by 12 and add them to the number of extra inches.

For example, if your height is 5 feet 10 inches, multiply 5 by 12 (which gives 60″) and add them to the extra 10 inches (which gives 70″).

Now, we have the right measurements we can use in the formula.

There are three (3) simple steps for computing BMI with imperial values:

1. Multiply your weight in pounds by 703.

2. Multiply your height in inches by itself

3. Divide the figure from step 1 by the figure in step 3.

The resulting number is your BMI. Compare this BMI value with the weight status table above.

**Example**

Jane weighs 150lbs and is 5 feet 4 inches tall. She wants to know if she is overweight.

Jane’s height in inches is (5 *12) + 4 = 64″

1. Using the first part of the formula we multiply her weight by 703. 150 × 703 = 105450

2. Using the second part of the formula we multiply Jane’s height by itself. 64 x 64 = 4096

3. Finally we divide the first figure by the second. 105450 / 4096 = 25.74

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Jane’s BMI is **25.74**

We compare this value to the weight categories listed on the BMI table and find that she is *Overweight* .

**Limitations Of The BMI Formula**

There’s no doubt that the body mass index calculation has been useful to many physicians.

However, since it’s creation many have stated that this method of calculating BMI is not fit for purpose.

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BMI does not take into account other factors which may affect a persons height or weight:

• Body builders and athletes with a high proportion of muscle mass.

• The elderly (whose height and muscle mass may fall over time), frail people, and those affected by certain illnesses.

• Lactating or pregnant women.

• Children and teenagers who have not reached physical maturity and are still growing.

• A tendency for natural differences in height and weight ratios between races.

However the case, I’m sure you can calculate your BMI now. Calculate your BMI and let’s know the category range it falls. We would be expecting your answers in the comment box. Do enjoy the rest of your day.

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