Credit Utilization Calculator (overall & per card)

Understanding the credit utilization calculator — concept and principle

This calculator finds your credit utilization ratio, the share of your revolving credit limits you are using, both overall and on your most-used card. It also shows total balances and limits, available credit and how much to pay down to reach a target. Use it before applying for a loan, to manage your credit score or to decide which card to pay first.

Overall use is 15%, below the commonly cited 30% line; one card is at 24%.

How it is calculated

Overall utilization = total balances ÷ total credit limits × 100.
Single-card utilization = balance ÷ limit for each card; the highest is shown.
Available credit = total limits − total balances.
Pay down to reach target = total balances − target % × total limits.

Enter one card per line as balance / limit.

The principle

Credit scoring models use utilization as a signal of how dependent you are on borrowed money: a lower share of available credit in use generally suggests less risk. Models look at both the overall ratio and individual cards, so one maxed-out card can count against you even if the overall figure is low. Utilization is based on the balances reported to the credit bureaus, often the statement balance, so paying before the statement date can lower the reported figure.

Worked example

Default inputs: cards $1,200 / $5,000, $300 / $3,000 and $0 / $2,000; target 10%.

Total balances = $1,500; total limits = $10,000.
Overall utilization = 1,500 ÷ 10,000 = 15%.
Highest single card = 1,200 ÷ 5,000 = 24%.
Available credit = $8,500.
To reach 10%: 1,500 − 0.10 × 10,000 = $500 to pay down. Status: below 30%.

How to read the result

Where does your result fall?

Experian notes that utilization of 30% or more starts to hurt scores more clearly and that people with the highest scores tend to keep utilization in the single digits. Lower is generally better, but the ratio is only one factor alongside payment history, length of credit history and other items. Utilization has no memory in most models: once balances fall, the effect fades.

Common mistakes

Closing an unused card, which lowers total limits and raises utilization.
Looking only at the overall ratio and ignoring one card near its limit.
Assuming paying in full each month means 0% utilization; the reported balance may be the statement balance.
Including installment loans, which are not revolving credit.

Keep in mind: Scoring models differ between bureaus and countries; Korean credit scoring (e.g. NICE, KCB) uses its own factors. This is a general guide, not financial advice.

Frequently asked questions

What is a good credit utilization ratio?

Below 30% is a common guideline; those with top scores tend to stay in the single digits.

Does each card's utilization matter?

Yes. Scoring models consider individual cards as well as the total.

How quickly does lowering utilization help?

Usually once the lower balances are reported, often within a billing cycle or two.

Sources: Experian, "What Is a Credit Utilization Rate?" (Ask Experian)

Checked 9 Nov 2026. Utilization ratio and the 30% / single-digit guidance: Experian, “What Is a Credit Utilization Rate?” (Ask Experian, credit education, 2024–25), including Q3 2024 averages for consumers with 800–850 scores.

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