What credit utilization is
Credit utilization is the percentage of your available credit you're currently using: utilization = balances ÷ credit limits × 100. If you owe $2,400 across cards with $10,000 of total limits, your utilization is 24%. It's calculated both per-card and overall, and it's one of the most powerful factors in your credit score — typically around 30% of the score, second only to payment history (see [what affects your credit score](/articles/what-affects-your-credit-score/)).
Why lenders care
High utilization signals risk: someone using most of their available credit looks financially stretched and more likely to miss payments. Low utilization signals control. Because it's such a strong signal, utilization can swing your score significantly — and unlike most factors, it can change fast, since it updates whenever balances are reported.
The targets to aim for
- Under 30% — the widely-cited maximum. Above this, your score usually takes a hit.
- Under 10% — the sweet spot. The lowest utilization (while still using cards) tends to maximize this part of your score.
- Not 0% — showing a small balance that you pay off is generally slightly better than showing zero everywhere, which can look like inactivity.
How to lower it fast
Utilization is one of the quickest score levers because it responds immediately to balance changes:
- Pay down balances — the direct route. The calculator shows exactly how much to pay to reach 30% and 10%.
- Pay before the statement closes. Card issuers report the statement balance, so paying down *before* the statement date lowers the utilization that gets reported — even if you'd pay it off anyway.
- Request a credit-limit increase. A higher limit lowers utilization instantly without changing your spending (just don't spend more to match).
- Keep old cards open. Closing a card removes its limit, which *raises* your utilization — usually keep them open, per [how to build credit](/articles/how-to-build-credit/).
The bottom line
Credit utilization is the rare credit factor you can improve in a single billing cycle. Keep it under 30% always, aim for under 10% before applying for anything important (a mortgage, car loan, or new card), and use the "pay before the statement date" trick to control what's reported. It's one of the easiest, fastest ways to protect and boost your score.