# BMI TEST - Healthy Weight

## How Do I Interpret Body Mass Index Information?

Body mass index (BMI) is a person’s weight in kilograms divided by the square of height in meters. BMI is an inexpensive and easy screening method for weight category—underweight, healthy weight, overweight, and obesity.

BMI does not measure body fat directly, but BMI is moderately correlated with more direct measures of body fat 1,2,3. Furthermore, BMI appears to be as strongly correlated with various metabolic and disease outcome as are these more direct measures of body fatness 4,5,6,7,8,9.

## How is BMI calculated?

BMI is calculated the same way for both adults and children. The calculation is based on the following formulas:

 Measurement Units Formula and Calculation Kilograms and meters (or centimeters) Formula: weight (kg) / [height (m)]2 With the metric system, the formula for BMI is weight in kilograms divided by height in meters squared. Because height is commonly measured in centimeters, divide height in centimeters by 100 to obtain height in meters. Example: Weight = 68 kg, Height = 165 cm (1.65 m)Calculation: 68 ÷ (1.65)2 = 24.98 Pounds and inches Formula: weight (lb) / [height (in)]2 x 703 Calculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703. Example: Weight = 150 lbs, Height = 5’5″ (65″)Calculation: [150 ÷ (65)2] x 703 = 24.96

## How is BMI interpreted for adults?

For adults 20 years old and older, BMI is interpreted using standard weight status categories. These categories are the same for men and women of all body types and ages.

 BMI Weight Status Below 18.5 Underweight 18.5 – 24.9 Healthy Weight 25.0 – 29.9 Overweight 30.0 and Above Obesity

For example, here are the weight ranges, the corresponding BMI ranges, and the weight status categories for a person who is 5′ 9″.

 Height Weight Range BMI Weight Status 5′ 9″ 124 lbs or less Below 18.5 Underweight 5′ 9″ 125 lbs to 168 lbs 18.5 to 24.9 Healthy Weight 5′ 9″ 169 lbs to 202 lbs 25.0 to 29.9 Overweight 5′ 9″ 203 lbs or more 30 or higher Obesity