Body Mass Index (BMI) Calculation

Body Mass Index commonly known as BMI is a measure of body weight based on weight and height. This does not actually measure the percentage of body fat but it is used to estimate a healthy body weight. Due to its ease of measurement and calculation, it is the most widely used diagnostic gizmo to identify weight issues within a population, usually whether individuals are underweight, fat or obese.

To calculate your BMI
When you want to base the unit in Metric, BMI Formula   
BMI =     Mass (Kilogram)/Height (meter)2

When calculating our BMI based on Imperial
BMI =    Mass (Pounds)/ Height (inches)2    x    703.069

The table below can summarize the weight categories

Category	BMI range – kg/m2	BMI Prime	Mass (weight) of a 1.8 metres (5 ft 11 in) person with this BMI
Severely underweight	less than 16.5	less than 0.66	less than 53.5 kilograms (8.42 st; 118 lb)
Underweight	from 16.5 to 18.4	from 0.66 to 0.73	between 53.5 and 59.9 kilograms (8.42 and 9.43 st; 118 and 132 lb)
Normal	from 18.5 to 24.9	from 0.74 to 0.99	between 60 and 80.9 kilograms (9.4 and 12.74 st; 130 and 178 lb)
Overweight	from 25 to 29.9	from 1.0 to 1.19	between 81 and 96.9 kilograms (12.8 and 15.26 st; 180 and 214 lb)
Obese Class I	from 30 to 34.9	from 1.2 to 1.39	between 97 and 112.9 kilograms (15.3 and 17.78 st; 210 and 249 lb)
Obese Class II	from 35 to 39.9	from 1.4 to 1.59	between 113 and 129.9 kilograms (17.8 and 20.46 st; 250 and 286 lb)
Obese Class III	over 40	over 1.6	from 130 kilograms (20 st; 290 lb)