Fat Free Mass Index

I heard of the BMI, Body Mass Index, but have not come across FFMI, or Fat Free Mass Index, before going on my present fitness journey.  Using my measurements from the beginning of my journey versus now my FFMI was and is as follows:
 
June 29, 2020: 16.44 (BMI: 26.9 "overweight")
Oct 5, 2020: 17.79 (BMI: 25.5 "overweight")
 
FFMI accounts for height, weight, and body fat percentage whereas BMI only accounts for height and weight. 
 
In June my body fat was estimated to be 38.95% using the two calculators (here and here).  My lean mass was about 93 lb.  In October 30.25% body fat and 100.4 lb of lean mass.  Using the 30.25% body fat percentage and plugging it into the Fat Free Mass Index Calculator yields the 17.79 FFMI.  The following chart shows how I should stack up:
 

Initially, I was in the category of "fat woman".  No surprise there. It looks like I'm still on the line for being a "fat lady", but if I were to gain more lean mass I could end up in the "elite strength athlete" category.  If I were to plug in my projected weight and body fat percentage for Dec 2020, I could end up with a FFMI of 19 with body fat percentage of 24.5% and BMI of 25.2 which is still considered "overweight".  That's if I really gain lean mass at a rate of 0.5 lb/wk (I'm still skeptical) barring anything interrupting my workouts, etc.  I'm not sure if the rate will start slowing soon or not.  I would not be surprised if I really gain lean mass more slowly and it takes many more months to reach a FFMI of 19!
 
According to bodybuildingmealplan.com I'm on the line for being "athletic" and "very well built" with an FFMI of 17.80, and height 5'3".  I do not think I "look it", but I'll take it!
 

 

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