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This is from the book Hardcore bodybuilding: a Scientific Approach, written by strength training authority Frederick C. Hatfield, Ph.D. Dr. Hatfield, better known as Dr. Squat, is the co-founding Director of Sports and Fitness Sciences for the prestigious International Sports Sciences Association. As a three-time winner of the World Championship of Powerlifting, Dr. Hatfield is not only well versed in weight training theory, but also on its application.

Before you use the formulas, you need two measurements:
Measurement 1: Body weight
Measurement 2: Waist girth

Procedure:

1. Multiply your body weight by 1.082 to get result 1. Record the number below.
__________x .1.082=_________
body weight / Result 1

2. Add result 1 to 94.42 to get result 2.

_______+94.42=_________
Result 1 / Result 2

3. Multiply you waist girth by 4.15 for result 3.
________x4.15= ________
waist girth / Result 3

4. Subtract result 3 from result 1 for your lean bodymass

______-_______=_____________
Result2 / Result 3 / Lbm

5. Subtract your lean body mass from your total body weight for result 4.
_________-_________=___________
Total body / LBM / Result 4

6. Multiply result 4 by 100 for result 5.
_________x 100=________
Result 4 / Result 5

7.Divide result 5 by your body weight for your body fat percentage.
________ / __________=___________
Result 5/ Bodyweight /Body Fat%


Ex...
A man who weighs 190 pounds has a waist girth of 30 1/2 inches would calculate his body fat percentage in the following way.
1. 190x 1.082=205.58
2. 205.58+94.42=300
3.30.5x4.15=126.575
4. 300-126.575= 173.425
(Lean Body Mass)
5. 190-173.425=16.575
6.16.575x100=1657.5
7.1657.5 / 190 = 8.72% bodyfat.

Note:
The formulas above are approximations. The goal is to have a point of reference from which to work. We recommend that you measure your body fat every three weeks. If you see a pattern of gaining muscle and losing fat, then you know your program is on track. If not, examine which part of your program isn't working.

Credit to the following I took word for word from the bodysculpting bible swimsuit workout...by James Villepigue....him and Hugo Rivera commonly write books together and I would recommend their bodysculpting bible series to anyone...great information and great books by two awesome trainers.

rmcfar

"When i was 15 years old, i took all of my clothes off and looked in the mirror. When i stared at myself naked, I realized that to be perfectly proportioned I would need 20 inch arms to match the rest of me." -Arnold