How credit utilization works
Utilization is simply your revolving balances divided by your credit limits, expressed as a percentage. It’s one of the most influential inputs to your credit score, and uniquely, it’s one you can move fast: because it’s recalculated from each month’s reported balance, paying a card down can lift your score within a single billing cycle.
The utilization formula
Utilization = total balances ÷ total limits
Computed both overall and for each card. Under 10% is excellent, under 30% is good — the bands this calculator color-codes against.
What makes this calculator different
- Per-card and overall, side by side. Scoring models look at each card individually — a single maxed card hurts even when your aggregate is fine. We show both, color-coded.
- The exact paydown to your target. Not just “you’re high” — the precise dollar amount to bring your overall utilization to the target you choose.
- Guidance bands, visualized. Every card maps to the familiar under-10% / under-30% guidance with a colored bar and status, so you can see at a glance where to act first.
- Shareable. Your full setup lives in the URL — copy the link to revisit or compare later.
Frequently asked questions
What is credit utilization?+
Credit utilization is the percentage of your available revolving credit that you’re currently using — your total card balances divided by your total credit limits. If you owe $2,000 across cards with $10,000 of combined limits, your utilization is 20%. It’s one of the biggest factors in a credit score, weighted second only to payment history, because it signals how reliant you are on borrowed money.
Why is 30% the magic number?+
The “keep it under 30%” rule is a widely-cited rule of thumb, not a hard cliff. Scores tend to improve steadily as utilization falls, and the people with the highest scores usually sit in the single digits. Treat 30% as a ceiling you don’t want to cross and under 10% as the target if you’re optimizing — there’s no penalty for using less.
Does per-card utilization matter, or just the overall ratio?+
Both. Scoring models look at your aggregate utilization across all cards and the utilization on each individual card. A single maxed-out card can ding your score even when your overall ratio looks healthy, which is why this calculator color-codes every card separately. If one card is running hot, paying it down — or spreading the balance — can help even if your totals don’t change much.
Will paying off my balance raise my score quickly?+
Often yes. Unlike payment history, utilization has no memory: it’s recalculated from whatever balance your issuer reports each month, so a high ratio doesn’t haunt you. Pay a card down before its statement closes and the lower balance is what gets reported, so your score can rebound within a billing cycle or two — much faster than most credit factors.
Should I close a card I don’t use?+
Usually not, at least for utilization’s sake. Closing a card removes its limit from your total available credit, which raises your overall utilization even if your balances haven’t changed. It can also shorten your average account age over time. Unless the card carries a fee that isn’t worth it, keeping it open and occasionally active typically helps your utilization more than closing it.
Disclaimer: This calculator is for educational purposes only. Credit-scoring models weigh utilization differently and use the balances your issuers report, which may differ from your current balances. It is not financial or credit advice.