What Is Personal FinanceCredit utilization is the percentage of your available credit that you currently use. Divide your total balances by your total credit limits to get it.
The formula
Credit utilization = Total balances / Total credit limits
A $10,000 total credit limit with a combined balance of $3,000 gives you 30% utilization.
Why it matters so much
Credit utilization drives a large share of most credit scoring models, second only to payment history. See how credit scores work for the full breakdown. High utilization signals higher risk to lenders even when you pay on time, because it suggests heavy reliance on available credit.
What counts as good
A common rule of thumb keeps utilization under about 30%, with lower generally better. Some of the best scores sit in the single digits. There is no universal hard cutoff, but the pattern holds: less used credit relative to your limits tends to help your score.
A timing detail that trips people up
Utilization often gets calculated from your statement balance, the balance on the day your statement closes, not your balance on the due date. Paying down a card between the statement date and the due date does not always lower what gets reported. Some people pay down a chunk of their balance before the statement closes instead of waiting for the due date.
Utilization is one input into a broader picture. See how credit scores work for how it fits alongside payment history, and try the debt payoff calculator if you are paying down a balance.
Exact scoring impacts vary by scoring model and lender. Nothing here guarantees a specific score change from a specific action.