I may not be the best one to answer, but I'll give it a shot:
Basically, utilization is computed by dividing the amount(s) owed by the credit limit(s),
ie: $500 owed on a $1000 CL = 50% utilization. For multiple cards, you add all amounts owed and divide by total of CLs. (See the explanation/outline HinH provided above on my accounts....very helpful!!)
What I was confused about is the scoring of utilization, whether it's on a total amount or per card. From what I've read, and these replies, it's both, and is probably contingent on other factors as well, which is why "YMMV"......it could be a little different from person to person. But bottom line is that you want utilization really low: 1-9% (ie: $300 owed on $5k CL)
I'm going to try PIF on over half of my accounts and see what happens to score, and then will be paying way down on remaining cards with high utilization, and again, see what happens. I hope what happens is that I see a big increase!!LOL . As mentioned, Simulator shows a 30-50 point increase just by my paying $600 over 3 months, so I will definitely be making better utilization a priority!!
FICOS: TU 732(05-16-16) EQ '08 739( 05-16-16) EX 737 (08-17-16)