I've head conflicting information. What do I need to do regarding the 30% of my FICO score that has to do with "credit usage" or "Ratio of your revolving balances to your credit limits". Can someone help me understand if this section of the fIco formula is revolving credit only. I've heard it is also installment debt. If so, what is the threshold of installment debt I need to decrease down to. That is, I have student loans that are new, and the ratio for these installment loans is currently 91%. To help get my score up do I need to shoot for 80% or some other number???? Also, for my revolving debt, if my total ratio across 8 cards is 21% (which is great) but a couple of those cards are at 85+% should I focus on getting those two cards down below 80% or some other number to increase my scores???