Re: How do I figure out what a male's bodyweight would be at 7% bodyfat?

There is not a really scientific way to do this.  The best estimate is to 
calculate the amount of the current body weight that is now fat (12.57% of 
146.3 pounds, which is 18.4 pounds) and then the amount of body weight that 
would be fat at 7% body fat (7% of 146.3 pounds, which is 10.2 pounds).  
The difference, 8.2 pounds, would be the difference in body weight.  It is 
important to realize that it is impossible to lose ONLY body fat; some 
muscle is inevitably lost in a weight loss program that emphasizes a 
reduction in calorie intake.  Muscle might also be gained if an exercise 
program is adopted.  If muscle is gained, body weight might increase as 
body fat is lost.