So before the "Multiplier" option was added in the calculator for Apex I tried to convert my 103 FOV in Overwatch to the cl_fovscale value myself, and 1.22868960125 was the number I got. It seemed to be the correct number because 103 Hdeg Res = 86.631971 Hdeg 4:3 = 1.22868960125 in the config. It seemed correct because when I tried to convert 10 Overwatch sens to Apex with my Apex FOV set to 86.631971 (Hdeg 4:3) in the calculator (MDH 0%) I got a perfect 3.000000 sensitivity instead of 3.000001 or something and that's what I based the 86.631971 number on lol.
Now that "Multiplier" is an option, when I convert from 103 Hdeg Res it gives me cl_fovScale "1.2376". My 1.22868960125 value also converts to 102.3903 (Hdeg Res). Also, with 1.2376 (Multiplier) in the calculator, it gives me 3.000001 Apex sensitivity. I'm just curious why the correct conversion just so happens to be 1.2376 FOV with 3.000001 sens instead of 1.22868960125 FOV with 3.000000 sens.