BMI Formula

BMI formula (Body Mass Index Formula) is a manual calculation of BMI instead of BMI calculator.calculating BMI needs only two measurements weight and height.We can calculate it by two ways:

1-BMI Metric Formula.


The units of measure for the original formula is thus “kilograms per meter squared” (kg/m2).

2-BMI English Formula.

The BMI Formula Using “Pounds & Inches”  instead of ‘kilogram & meters is known as English formula.





Height(meters)= {height(inches)}/39.37001




BMI Conversion Factor.

BMI  Conversion Factor=(39.37001)^2/(2.204623)=703.07

 Calculate your BMI then go to the table to find your category.

CategoryBMI kg/m2
Very severely underweight less than 15.0
Severely underweight from 15.0 to 16.0
Underweightfrom 16.0 to 18.5
Normal (healthy weight) from 18.5 to 25
Overweightfrom 25 to 30
Obese Class I (Moderately obese) from 30 to 35
Obese Class II (Severely obese) from 35 to 40
Obese Class III (Very severely obese) Over 40
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