Question

what is BMI calculation.how to calculate BMI

Answer 1

✌ MERHABA;✌


➡Body mass index is a measure of body fat and is commonly used within the health industry to determine whether your weight is healthy. BMI applies to both adult men and women and is the calculation of body weight in relation to height. This article delves into the BMI formula and shows you how to calculate your BMI manually using mathematics.



BMI formula

The formula for BMI was devised in the 1830s by Belgian mathematician Adolphe Quetelet. BMI is universally expressed in kg/m2. If imperial units are used (pounds and inches) then an additional conversion factor is applied.

The first formula we've listed below is the metric formula, using kilograms and meters. The second one is the English imperial formula, which uses units of pounds and inches.

Metric BMI Formula

BMI = weight (kg) ÷ height2 (m2)

Imperial BMI Formula

BMI = weight (lb) ÷ height2 (in2) × 703

Let's go through a couple of examples to demonstrate how these formulae work.

How to calculate your BMI (metric units)

Simple steps to work out your BMI:

Multiply your height in meters (m) by itselfDivide your weight in kilograms (kg) by your step 1 result

Example using formula

For an adult with height of 180 cm and weight of 75 kg. Our first step needs to be to convert the height into meters (British spelling: metres). As there are 100cm in a meter, we divide our figure by 100. This gives us 1.8m.

Let's plug those figures into our formula:

BMI = 75 ÷ (1.8 × 1.8)

BMI = 75 ÷ 3.24

This gives us a BMI figure of 23.15.


How to calculate your BMI (imperial units)

Simple steps to work out your imperial BMI:

Multiply your height in inches (in) by itselfDivide your weight in pounds (lb) by your step 1 resultMultiply the result from step 2 by 703.

Example using formula

For an adult with height of 5ft 11 inches and weight of 155 pounds (lb). Step one is to convert the height into inches only. There are 12 inches in a foot, so we simply multiply the 5ft by 12 and then add the 11 inches. This gives us a total of 71 inches.

Let's plug those figures into our formula:

BMI = (155 ÷ (71 × 71)) × 703

We do the multiplication inside the brackets first:

BMI = (155 ÷ 5041) × 703

And then...

BMI = 0.030747867 × 703

This gives us a BMI figure of 21.62.⬅

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Answer 2

BMI is Body Mass Index. It is used to see if an adult is overweight, underweight or fit. It is calculated by dividing weight by height^2 (in kilograms and meters respectively)