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Q: At a fitness club, they used an electronic device to record my sex, age, weight, and height. Then they took a probe reading on my forearm. The results showed the percent of my body fat. My reading was 14%, which they said was good. What are the normal ranges based on age and sex?
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The Trusted Source
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Howard LeWine, M.D.

Howard LeWine, M.D., is chief editor of Internet Publishing, Harvard Health Publications. He is a clinical instructor of medicine at Harvard Medical School and Brigham and Women's Hospital. Dr. LeWine has been a primary care internist and teacher of internal medicine since 1978.

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March 31, 2010
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A:

A 14% reading for body fat is generally considered excellent for a "healthy" male. For a female, 14% would be unusual, unless the woman were an athlete.

However, there really is no normal for percent body fat, just as there is no ideal body weight. The "right" weight and fat percent for an individual depends upon multiple factors, such as:

  • General health
    A very low percent of body fat and low body weight in someone who is not exercising regularly can indicate a medical problem.
  • Distribution of body fat
    Even if your weight is close to the normal range, a large waist size may mean you have an unhealthy amount of belly fat (visceral fat). Increased amounts of belly fat increase the risk of diabetes and heart disease.
  • Metabolism
    How your body handles excess calories plays a large role in whether those calories get deposited in fat or turn into energy used in physical activity and body heat.
  • Amount and intensity of physical activity
    You not only burn calories during exercise, you continue to burn calories afterward as muscles need to replenish their energy stores.
  • Musculature
    A higher than normal body mass index (BMI) or higher than desired amount of body fat is less important if you are building or maintaining muscle with exercise and resistance training.

Rather than just relying on one measurement of whether you are overweight, I suggest using a combination of measurements:

  • Waist size
    There is no consensus on normal for this measurement either. Women should strive for 30 inches or less and men for 35 inches or less.
  • Ratio of waist size to hip size
    Use a measuring tape to find the size of your waist just above your belly button. Then measure the size of your hips around the widest part of your buttocks. Divide the waist size by the hip size. The ideal waist to hip ratio for women is 0.7. For men, it is 0.9. If your number is higher than this, you may have too much belly fat.
  • Body mass index (BMI)
    For most people, this one probably is the least helpful. If you have a BMI of 30 or over (obese) or less than 18.5 (underweight), BMI is meaningful.

I put less emphasis on percent of body fat.

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