How can I figure out my BMI?

Diana Meeks
Diana Meeks on behalf of Sigma Nursing
Family Practitioner

The body mass index (BMI) is a ratio of your height and weight. To calculate your BMI, use this 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

If your BMI is between 25 and 30, you are considered overweight; if it is above 30, you are considered obese. For instance, if you are 5’ 5” tall and weigh 151 pounds, you are considered to be “overweight.” If you are the 5’ 5” tall and weigh 180 pounds, you are in the “obese” category. If you are 5’ 11”, you are overweight at 179 pounds and obese at 215 pounds. Again, being overweight or obese is associated with a risk of chronic illness such as cardiovascular disease, hypertension, and type 2 diabetes.

It’s important to keep in mind that while the BMI is used by many healthcare practitioners, it can be misleading in some adults. Some men and women may be given a higher BMI yet have large frames or an abundance of muscle. Even though these men and women may have a BMI over 25, they may not have excessive body fat.

To figure out your BMI it will require a little math. I use charts and graphs with my live clients so it is faster and easier to gauge where someone is.

BMI = ( Weight in Pounds / ( Height in inches x Height in inches ) ) x 703

Or your BMI will be figured out for you when you go through Dr. Oz's 11 Weeks to Move it and Lose it in 2011. Just visit to get started today!

A healthy Body Mass Index (BMI) reading is 18.5-24.9. The official scores are as follows:

  • Below 18.5 = Underweight
  • 18.5 – 24.9 = Normal
  • 25.0 – 29.9 = Overweight
  • 30.0 - 39.9 = Obese
  • 40 and above = Morbidly obese
Dr. Mehmet Oz, MD
Cardiologist (Heart Specialist)

To determine your body mass index you must know your weight and your height. Watch this video demonstration of a BMI calculation.

Ideal weight calculator (body mass index) is a reliable indicator of your body’s fitness level, and most importantly, your health risk. It works by calculating your weight and height.

To use a calculator to deturmine your BMI, go to:

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.