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How is your credit score related to credit utilization?
1 - yes, it's fine to pay in full and it helps your score. 2 - see chart above, it's calculated based on what the bill shows each month.  3 - answered by chart. 1-19% utilization is ideal. 0% is actually worse than 41-60% Note: The above image was from Credit Karma. A slightly different image appears at the article The Relationship Between Your Credit Score and Credit Card Utilization Rate. I don't know how true this really is. Since writing this answer, I've seen offers of a true "FICO score" from multiple credit cards, and have tinkered with my utilization. I paid my active cards before the reporting date, and saw 845-850 once my utilization hit 0. Credit Karma still has me at 800.