How to Calculate Your Credit Utilization Ratio

To calculate your credit utilization ratio, add up the balances on all your revolving credit accounts, add up their credit limits, divide total balances by total limits, and multiply by 100. If you owe $4,000 across cards with a combined $17,000 in limits, that’s $4,000 ÷ $17,000 = 0.235, or about 23.5 percent utilization. The math takes two minutes once you have your statements in front of you, and it works the same whether you have one card or ten. Utilization makes up roughly 30 percent of a FICO Score, second only to payment history.1myFICO. How Owing Money Can Impact Your Credit Score

Which Accounts to Include

Only revolving credit counts. Credit cards, retail store cards, and personal lines of credit all qualify because they let you borrow, repay, and borrow again up to a set limit. Installment loans like mortgages, auto loans, and student loans follow a fixed payoff schedule and don’t factor in.2Experian. What Is a Credit Utilization Rate?

A few edge cases are worth knowing before you start adding numbers:

  • Home equity lines of credit are technically revolving, but FICO Scores exclude HELOCs from utilization because the debt is secured by your home. VantageScore does include them. If you carry one, run the math both ways to see what each model sees.3Experian. How Does a HELOC Affect Your Credit Score?
  • Small business credit cards are a gray area. Some issuers report business card activity to the personal credit bureaus, in which case the balance and limit affect your personal ratio. Others report only late payments, or nothing at all. Check with the issuer.4Experian. Will Your Business Credit Card Show Up on Your Personal Credit Report
  • Charge cards with no preset spending limit are typically left out, because there’s no fixed ceiling for the scoring model to measure against.5Capital One. What Is a No Preset Spending Limit Card?
  • Buy-now-pay-later loans are also out. They’re tied to a single purchase rather than an ongoing credit line, and most BNPL providers don’t report to credit bureaus.6Federal Reserve Bank of St. Louis. Buy Now, Pay Later: A Credit Alternative
  • If you’re an authorized user on someone else’s card, the balance and limit usually appear on your report, so include that account too.7Experian. Are Authorized-User Accounts Reported to All Three Bureaus?

Which Balance Number to Use

For each account you need two figures: the balance and the credit limit. The credit limit is easy—it’s the maximum you’re allowed to charge, listed on your statement, in the issuer’s app, or on your credit report.

The balance is where people get tripped up. The number that matters is the one your issuer reports to the credit bureaus, and that’s almost always the statement balance: what you owed on the last day of your billing cycle.8Experian. Why Is the Credit Card Balance on My Credit Report Different? Your real-time balance in the app shifts daily with purchases and payments, but the bureaus only get an update about once a month, usually shortly after your billing cycle closes.9Experian. When Do Credit Card Payments Get Reported

So if you pay your card in full on the due date but your statement closed two weeks earlier showing a $3,000 balance, the bureaus see $3,000, not zero. Use the statement balance for a calculation that matches what lenders and scoring models are looking at.

Per-Card Utilization

Divide each card’s balance by its limit, then multiply by 100. A card with a $1,200 balance and a $5,000 limit sits at 24 percent:

$1,200 ÷ $5,000 = 0.24 × 100 = 24 percent

Do this for every card. Scoring models look at per-card utilization on its own, not just the total, and a single maxed-out card can drag your score down even when your aggregate ratio looks fine. Cards above roughly 50 percent tend to cause the most noticeable damage on an individual basis.

Aggregate Utilization

Add up every revolving balance, add up every revolving limit, divide, multiply by 100. Three cards as an example:

  • Card A: $500 balance, $2,000 limit
  • Card B: $1,500 balance, $5,000 limit
  • Card C: $2,000 balance, $10,000 limit

Total balances: $4,000. Total limits: $17,000. That’s $4,000 ÷ $17,000 = 0.235, or 23.5 percent. This aggregate number carries more weight in scoring models than any single card’s ratio, and it’s the figure lenders use as a quick snapshot of how heavily you’re leaning on your available credit.10Equifax. What Is a Credit Utilization Ratio?

What the Number Means

Utilization sits inside the “amounts owed” category of FICO scoring, about 30 percent of your score.1myFICO. How Owing Money Can Impact Your Credit Score In VantageScore models, it carries roughly 20 percent of the total weight.11VantageScore. The Complete Guide to Your VantageScore 4.0 Credit Score

The commonly cited “stay under 30 percent” rule is a ceiling, not a target. People with the highest FICO Scores tend to keep utilization in the single digits. Going above 30 percent tends to noticeably hurt your score, and higher climbs correspond to greater statistical risk in the model’s eyes.12myFICO. How FICO Scores Look at Credit Card Limits One quirk: reporting a zero balance across every card doesn’t help as much as carrying a small balance on at least one, because 0 percent tells the model you’re not actively using credit.13Experian. Is 0% Utilization Good for Credit Scores?

Utilization has no memory. Unlike a late payment, once the ratio comes down, your score starts recovering the next time your issuers report.

When Your Ratio Changes Without New Spending

The calculation is a fraction, and the denominator can move on its own. Two situations spike utilization even when you haven’t charged anything.

Closing a card removes its limit from the total available credit side of the equation. Say you have $5,000 in balances across three cards with a combined $15,000 limit—about 33 percent utilization. Close one card with a $5,000 limit and no balance, and total limits drop to $10,000 while the debt stays at $5,000. Utilization jumps to 50 percent.14Equifax. How Closing a Credit Card Account May Impact Credit Scores

Credit limit decreases work the same way. Issuers can lower your limit for inactivity, changes to their risk models, or economic conditions, and they don’t always warn you first. A combined limit drop from $10,000 to $7,000 while you owe $3,000 pushes your ratio from 30 percent to about 43 percent overnight.15Equifax. How Will a Lowered Credit Limit Affect My Credit Scores? Watch for limit-change notifications, especially on cards you rarely use, and rerun your calculation whenever one lands.