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Obesity Medicine and Surgery Institute

Measuring Your Weight

Calculating Your Weight Class

There are several ways clinicians measure weight. Body Mass Index (BMI) and Waist Circumference are the most popular.

Calculating BMI

It is the same formula for both men and women: Divide your weight in kilograms by height in meters squared.

American Medical Association BMI scale

BMI 19-24.9               Normal
BMI 25-29.9               Overweight
BMI 30-34.9               Mild obesity (Class I)
BMI 35-39.9               Serious obesity (Class II)
BMI > 40                   Severe obesity (Class III)

Knowing your BMI is a good starting point to have a conversation with your doctor about your weight and health. If you discover your BMI falls into the severe obesity range, you should talk to your doctor immediately. Your weight could cause or complicate one or more the conditions linked to obesity and may lead to early death. 

Calculating Waist Circumference

Wrap a tape measure around the area above your hipbone, but below your rib cage. The measurements below can indicate an unhealthy weight in most people and may differ based on ethnicity.

Females           Waist circumference of 35+ inches
Males               Waist circumference of 40+ inches