Fat Calc

The results of your body fat calculations are based on your body parameters and categorized as shown in the tables formulated by the different health and fitness organizations.

The tables include a weight column showing a calculated weight range for each of the body fat ranges. From this, you can ascertain what you would need to weigh to fall into any of the other categories. The weight ranges are only accurate if you gain or lose weight in such a way as to maintain your current muscle mass. In essence, the weight ranges reflect only changes in body fat.

This should give you some idea of what you need to weigh for a desired percentage of body fat at your current level of lean body mass.

American Council on Exercise

The American Council on Exercise (ACE) was founded in 1985 with national headquarters in San Diego. It is a non-profit organization with a commitment to enrich the quality of life through safe and effective physical activity and exercise. The organization has a mission to help protect people from ineffective fitness products and programs through scientific research and public education. ACE further protects the public by setting certification and continuing education standards for fitness professionals. ACE is one of the largest nonprofit fitness certification, education and training organization in the world.

The General Body-fat Percentages chart from ACE is one of the most commonly used body fat charts. Its main limitation is that it does not take your age into account. That is an important considering in evaluating body composition.

World Health Organization and the National Institutes of Health

The World Health Organization (WHO) is a United Nations agency with a primary role of directing international health within the United Nations system and to lead partners in global health responses. The National Institutes of Health (NIH) is an agency of the U.S. Department of Health and Human Services and is the Federal focal point for health and medical research offering health information for the public.

In response to a steadily increasing worldwide rate of obesity, the NIH and the WHO adopted body weight guidelines now commonly referred to as BMI or Body Mass Index. The guidelines assumed that body mass, when adjusted for body height, has a close association with body fatness. However, BMI is not appropriate for everyone. For people with muscular builds, it may overestimate body fat. Also gender and age is not taken into consideration, both of which are important.

The table is based on the research performed by Gallagher et al and published in The American Journal of Clinical Nutrition, Volume 72, Issue 3, 1 September 2000, Pages 694–701. It links body fat percent ranges to BMI guideline and takes gender and age into consideration.

American College of Sports Medicine

The American College of Sports Medicine (ACSM) is one of the largest sports medicine and exercise science organization in the world. With members and certified professionals worldwide, the organizations' work is advancing and integrating scientific research, providing educational and practical applications pertaining to exercise science and sports medicine.

The Fitness Categories tables above were adapted from tables 4.2 and 4.3 on pages 72 and 73 respectively, of ACSM's Health-Related Physical Fitness Assessment manual, 5th Edition.