# Body Mass Index

**BODY MASS INDEX (B.M.I)
**Keep in mind that BMI is a screening tool; it is not used to diagnose any medical conditions.

**BMI Formula**

BMI for men and women uses a mathematical formula that takes into account both a person’s height and weight. The formula for BMI equals a person’s weight in kilograms divided by height in meters squared (BMI=kg/m2).

With the English system, the BMI formula is:

Weight in pounds (lbs) divided by height in inches (in) squared and multiplied by a conversion factor of 703 .

(weight (lbs) / [height (in)]^{2} x 703

Therefore, to calculate BMI, take the weight (lbs) and divide it by height (in). Take the result of that calculation and divide it by height again. Then, multiply that number by 703. Round to the second decimal place.

An example of calculating BMI using the BMI formula: Weight = 150 lbs, Height = 5’5″ (65 inches)

BMI Calculation: [150 ÷ (65)^{2}] x 703 = 24.96

**BMI Categories**

- Underweight = less than 18.5
- Normal weight = 18.5 to 24.9
- Overweight = 25 to29.9
- Obesity = BMI of 30 or greater