💳 Credit Utilization Calculator

Credit utilization is the ratio of your current card balance to its credit limit, and it is commonly cited as the second-biggest factor in credit scoring after payment history. The formula is Utilization = Balance ÷ Limit × 100. For example, a card with a $3,000 limit and a $600 balance has 20% utilization, while a card with a $5,000 limit and a $2,200 balance has 44% utilization. With multiple cards, you should look at both individual ratios and the overall (aggregate) utilization = Total balance ÷ Total limit × 100. For the two cards above: overall utilization = (600+2,200) ÷ (3,000+5,000) × 100 = 2,800 ÷ 8,000 × 100 = 35%. A single card can carry a high individual ratio while your overall ratio stays lower if other cards have plenty of headroom, so it is important to check both figures together.

The commonly cited "30% rule" in the credit industry suggests keeping overall utilization at or below 30% to support your credit score, with under 10% considered even more favorable. This is a rule of thumb rather than an absolute standard — different scoring models weigh per-card versus overall utilization differently, and some penalize a single card that is nearly maxed out (e.g. above 90%) even if your overall ratio looks fine. Practical ways to lower utilization include: (1) making an early payment before the statement closing date so a lower balance is reported, (2) keeping unused cards open rather than closing them, since closing a card reduces your total available limit and can push utilization up, and (3) spreading spending across multiple cards so no single card spikes in isolation. Remember that utilization is only one input into your credit score — payment history, length of credit history, and recent inquiries all matter too.