Start with the two utilization calculations

Overall utilization is total reported revolving balances divided by total reported revolving limits. Per-card utilization applies the same calculation to each individual revolving account. Both views matter because a moderate overall percentage can still hide one nearly maxed-out card.

Use statement or reported balances when you can. A current app balance may not match the amount most recently sent to a credit bureau, and issuers do not all report on the same day.

  • Overall utilization = total revolving balances / total revolving limits x 100.
  • Per-card utilization = one card's balance / that card's limit x 100.
  • Do not include installment balances, such as auto or student loans, in this calculation.

A worked example

Suppose Card A reports a $2,400 balance on a $4,000 limit and Card B reports $900 on a $6,000 limit. Overall utilization is $3,300 divided by $10,000, or 33%. Card A is at 60%, while Card B is at 15%. The overall number alone does not show the concentration on Card A.

A $600 payment directed to Card A would reduce the combined balance to $2,700 and overall utilization to 27%. It would also reduce Card A to 45%. This example is arithmetic only; it does not predict a score change or tell you which bill to pay first.

Same utilization result, different interest cost: a controlled comparison

Use the same two cards from the example, and suppose Card A has a 12% annual rate while Card B has a 24% annual rate. Assume required minimum payments have already been handled, $600 is available as an extra payment, no new transactions occur, and neither account has a grace period or promotional rate. These are hypothetical inputs, not customer results.

Before the extra payment, a simplified one-month interest estimate is $2,400 x 12% / 12 plus $900 x 24% / 12 = $42. This monthly model deliberately excludes daily-balance timing, fees, and compounding within the month.

Put the extra $600 on Card A: balances become $1,800 and $900. Overall utilization is 27%, Card A is at 45%, and Card B is at 15%. Modeled monthly interest becomes $18 + $18 = $36.

Put the same extra $600 on Card B: balances become $2,400 and $300. Overall utilization is still 27%, Card A stays at 60%, and Card B falls to 5%. Modeled monthly interest becomes $24 + $6 = $30.

Both allocations lower aggregate utilization by exactly six percentage points, yet the second saves an additional $6 in this simplified month. The first lowers the most heavily utilized individual card further. The calculation shows why a utilization target alone cannot select the lowest-interest allocation. It also cannot establish which allocation would produce a better score.

  • Reproduce the baseline: combined balance $3,300; combined limits $10,000; estimated monthly interest $42.
  • Scenario A: pay Card A $600; combined balance $2,700; aggregate utilization 27%; estimated interest $36.
  • Scenario B: pay Card B $600; combined balance $2,700; aggregate utilization 27%; estimated interest $30.
  • For your own comparison, record each card's balance, limit, purchase APR, statement date, required payment, and any promotion before allocating extra money.

Build a plan without chasing a magic percentage

There is no single percentage that guarantees a particular credit score or approval. Scoring models, account history, lender policies, and the timing of reported data vary. A useful plan focuses on affordable progress and on-time payments rather than a promised score outcome.

List each revolving account, its reported balance, its limit, its annual percentage rate, and its due date. Protect required minimum payments first. Then compare what an extra payment would do to both the highest-cost balance and the most heavily utilized account.

  • Avoid using money needed for housing, food, insurance, taxes, or minimum payments.
  • Recalculate after a limit change, a large purchase, or a new statement balance.
  • Keep screenshots or statements so you can distinguish current balances from reported balances.

What the calculator can and cannot tell you

Funding Society's utilization calculator can show the result of the numbers you enter and estimate the payment needed to reach a selected mathematical level. It does not access your credit file, communicate with a bureau, recommend a lender, or estimate approval odds.

Treat the result as a planning snapshot. Verify account data directly with the issuer and review your credit reports for accuracy before relying on it.