Credit Utilization: How It's Calculated, What Doesn't Count, and How It Affects Scores

The utilization formula uses reported balances and limits

For one revolving account, the calculation is: reported balance ÷ reported credit limit × 100 = per-account utilization percentage. A fictional card with a $900 reported balance and a $3,000 reported limit has utilization of $900 ÷ $3,000 × 100 = 30%.

For overall utilization, add the balances on the included revolving accounts, add their credit limits, and then divide: total included balances ÷ total included limits × 100. Do not average the individual percentages; accounts with different limits would receive the wrong weight.

Use balances and limits from the same credit report and reporting date when possible. A card app's current balance can include newer activity than the balance furnished to a bureau, so mixing today's app balance with last month's report can produce a number that describes neither snapshot accurately.

A zero or missing credit limit needs review rather than an invented denominator. Dividing by zero is undefined, and substituting a guessed limit can make the result misleading. Check the account type, reported fields, and issuer records before calculating.

Which accounts and balances generally count

Start with credit cards reported as revolving accounts on the credit report. FICO says credit card accounts in a report can be included in its revolving-utilization calculations, including qualifying accounts on which the consumer is an authorized user. The scoring model and version still matter.

Some other revolving credit lines may be relevant, but account classification matters. Do not assume that every account with a reusable source of funds is treated like a credit card. Review how the account is reported and remember that different scoring models can treat account types differently.

Use the balance furnished to the reporting company, not an estimate based on spending and not automatically the minimum payment or statement balance. The reported balance may happen to match the statement balance, but that depends on the issuer's reporting practice and timing.

Both a card with a balance and an included card with a zero balance can affect the overall calculation: the zero-balance card contributes nothing to the numerator but may contribute its limit to the denominator. Whether a particular open or closed account qualifies must be determined from the report and scoring model rather than a universal spreadsheet rule.

What credit utilization does not count

Installment loans—such as mortgages, auto loans, student loans, and many personal loans—are not added to the revolving-credit utilization numerator or denominator. FICO says its Amounts Owed category separately considers amounts owed on different account types and the percentage still owed on installment loans. Excluding a loan from revolving utilization therefore does not mean the loan is irrelevant to a score or application.

Debit cards and prepaid cards spend existing funds rather than establishing an ordinary revolving credit limit, so they do not belong in this ratio. Checking, savings, investment, and retirement balances are assets, not revolving credit limits. Income also is not a credit limit and is not part of the utilization formula.

Collection accounts, public records, and inquiries are not revolving credit lines to insert into this calculation. They may appear in a credit report or affect a credit decision through other scoring or underwriting factors, but that is separate from revolving utilization.

FICO says a charge card generally is not included in revolving-utilization calculations when the issuer reports it as an open credit account rather than a revolving account. The word 'card' on the product is not enough; the reported account type matters.

Interest charges, annual fees, and the minimum payment are not separate inputs to the formula. They can change an account balance or the cost of borrowing, but utilization itself uses the resulting reported balance and reported limit.

Worked example: one fictional report snapshot

Everything in this example is fictional. On one report dated October 31, Card A shows a $900 balance and $3,000 limit, Card B shows a $300 balance and $6,000 limit, and Card C shows a $0 balance and $1,000 limit. All three are reported as eligible revolving credit-card accounts for this illustration.

Per-account utilization is 30% for Card A ($900 ÷ $3,000), 5% for Card B ($300 ÷ $6,000), and 0% for Card C ($0 ÷ $1,000). Overall utilization is $1,200 ÷ $10,000 × 100 = 12%, not 11.67%, which would be the unweighted average of the three percentages.

The same fictional report shows an auto loan with an $8,000 remaining balance and a $20,000 original amount. Neither figure enters the revolving-utilization totals. A $4,000 checking balance and debit-card spending are excluded too. They do not reduce the $1,200 numerator or increase the $10,000 denominator.

Now suppose a $600 payment on Card A posts and is included in a later report, with no other balance or limit changes. Card A's reported balance becomes $300 and its utilization becomes 10%. Overall utilization becomes $600 ÷ $10,000 × 100 = 6%. This illustrates arithmetic only; it does not predict a score change or guarantee that an issuer reports on a particular date.

How utilization can affect credit scores

FICO places revolving utilization within its Amounts Owed category. That category accounts for about 30% of a typical person's FICO Score, but utilization is only one part of the category—not a standalone 30% allocation. FICO says its scores can consider overall utilization and the highest utilization rates on specific revolving accounts.

This means an overall percentage does not tell the whole story. In the fictional example, overall utilization is 12%, while Card A is 30%. A model can evaluate both views rather than looking only at the combined ratio.

The CFPB explains that scoring models look at how close consumers are to their credit limits. It notes that many experts recommend using less than 30% of the total limit and that consumers with the highest scores often use less than 10%. These are general guidelines and observations, not score guarantees or universal cutoffs.

A reported balance can influence a score even when the cardholder pays in full by the due date. The CFPB notes that a score calculated while a high balance is showing can reflect that balance even if it is paid off the next day. A newer balance generally must be furnished and the score recalculated before the newer information can be reflected.

Utilization is not the whole score. Payment history, account age, account mix, recent applications, other amounts owed, model version, bureau data, and calculation date can all matter. Lenders can also consider income, obligations, application details, and their own policies outside the score.

What this does not mean

It does not mean you need to carry debt or pay interest. Resource A: Do You Need to Carry a Credit Card Balance to Build Credit? explains why a reported balance and interest-bearing carried debt are different.

It does not mean 30% is a cliff, 10% guarantees an excellent score, or 0% is universally best. There is no single percentage that guarantees a particular result for every model and credit profile.

It does not mean excluded accounts are unimportant. Installment balances, collections, payment history, and other information can affect scores or lending decisions outside the revolving-utilization calculation.

It does not mean every issuer reports the same balance on the same day or that every scoring model treats every account type identically. Check the report's account type, balance, limit, and date reported rather than relying on a generic rule.

It does not mean a lower calculated ratio automatically produces a score increase. The newer data must be reported and used in a recalculation, and other file changes can occur at the same time.

How Resources A and G help with the next check

Use Resource A when the current balance, statement balance, minimum payment, and reported balance do not match. Its terminology table and fictional statement explain why a balance can appear after payment without proving that interest was charged.

Use Resource G: Credit Report vs. Credit Score when you need to separate the report fields used in the utilization calculation from the score produced by a model. It also explains why scores can differ by model, bureau data, and calculation date.

For statement and furnishing timing, continue with Resource C. For the earlier general walkthrough of per-card and aggregate calculations, see Credit Utilization Ratio: How It Works and How to Calculate It.

Plain-English credit utilization terminology

How to calculate and check your credit utilization

1. STEP 1

   Choose one report snapshot

   Record the credit reporting company and report date so the balances and limits come from the same underlying data.

2. STEP 2

   Identify eligible revolving accounts

   Start with accounts reported as revolving credit cards and review other lines by account type rather than assuming every card or loan belongs in the ratio.

3. STEP 3

   Copy the reported fields

   List each included account's reported balance, credit limit, and date reported; flag missing or zero limits for review instead of inventing values.

4. STEP 4

   Calculate each account separately

   Divide each included account's balance by its own limit and multiply by 100.

5. STEP 5

   Calculate the overall ratio

   Add all included balances, add all included limits, divide the totals, and multiply by 100; do not average the account percentages.

6. STEP 6

   Keep exclusions separate

   Leave installment loans, debit and prepaid cards, income, assets, collections, and inquiries out of this revolving ratio while reviewing their separate relevance where applicable.

7. STEP 7

   Recheck a later snapshot

   After a newer issuer update, repeat the calculation and compare like with like without expecting a particular score or approval result.

Frequently asked questions

Sources and further reading

• myFICO — Understanding Accounts That May Affect Your Credit Utilization Ratio
• myFICO — How Owing Money Can Impact Your Credit Score
• myFICO — What's in my FICO Scores?
• CFPB — How do I get and keep a good credit score?
• CFPB — Will paying off my credit card balance every month improve my credit score?
• CFPB — Does it hurt my credit to close a credit card?
• AnnualCreditReport.com — Official source for free credit reports