Credit Score Impact Calculator
✦ Finance & MoneyUse this credit utilization calculator to see each card’s balance-to-limit ratio and your overall ratio now and after a payment, a limit increase, a closed or a new card. It is a credit score impact calculator in the only honest sense: the arithmetic the scorers say they look at, with no invented point change.
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- ✓ Nothing you type is stored
- ✓ No sign-up required
- ✓ Formula and sources shown
The formula
Credit utilization ratio — per card and overall
Per card: Uᵢ = Bᵢ ÷ Lᵢ
Overall: U = ΣBᵢ ÷ ΣLᵢ
After a payment P on card k: U′ = (ΣBᵢ − P) ÷ ΣLᵢ
After closing card k: U′ = (ΣBᵢ − Bₖ) ÷ (ΣLᵢ − Lₖ)Bᵢ = balance on card i, Lᵢ = its credit limit. Overall utilization is the aggregate ratio, not the average of the per-card ratios. A payment lowers the numerator; a limit increase or a new card raises the denominator; closing a card removes both its balance and its limit. Ratios are rounded to one decimal place for display. No score is computed: the FICO and VantageScore formulas are proprietary.
Calculating it by hand
- Enter the balance and credit limit for each credit card; add or remove rows with + Add card (up to 20).
- Pick a scenario tab — Payment, New limit, Close card, Open card or Transfer — and enter its amount or limit.
- Read the overall ratio now and after the scenario, the change in points, and how many cards sit above the 30% guideline.
- Open Account ages & hard inquiries to enter how long each card has been open and your hard pulls; the panels show the average age and the counts in the 12- and 24-month windows.
- Open the per-card table or download it as CSV; the share link carries your cards in the address after #, never to a server.
Worked examples
Three cards: the overall ratio
Enter Card 1 $3,000 on a $10,000 limit, Card 2 $800 on $5,000, Card 3 $0 on $3,000 (the sample cards).Card 1: $3,000 ÷ $10,000 = 30.0%. Card 2: $800 ÷ $5,000 = 16.0%. Card 3: $0 ÷ $3,000 = 0.0%.Overall: ($3,000 + $800 + $0) ÷ ($10,000 + $5,000 + $3,000) = $3,800 ÷ $18,000 = 21.1%.
Overall utilization 21.1%; Card 1 sits on the 30% guideline and the overall ratio is under it.
A $1,500 payment on Card 1
Scenario: Payment, apply to Card 1, amount $1,500 (the page default).Card 1 after: $3,000 − $1,500 = $1,500; $1,500 ÷ $10,000 = 15.0%.Overall after: ($1,500 + $800 + $0) ÷ $18,000 = $2,300 ÷ $18,000 = 12.8%.Change: 21.1% → 12.8%, a fall of 8.3 points. Cards above 30%: 0 of 3 before and after.
Overall utilization falls from 21.1% to 12.8%. Lower is the direction both scorers call favourable; no point change is computed.
Closing Card 3 ($0 balance, $3,000 limit)
Scenario: Close card, apply to Card 3.Balances unchanged: $3,800. Limits after: $10,000 + $5,000 = $15,000.Overall after: $3,800 ÷ $15,000 = 25.3%; change 21.1% → 25.3%, up 4.2 points.Account ages 48, 24 and 12 months: average 28 months now; once the closed card drops off the report (Experian: 10 years from closing), the average of the remaining two is 36 months.
Closing a $0-balance card raises overall utilization from 21.1% to 25.3% because available credit falls while balances stay the same.
Methodology
What utilization can and cannot tell you
Utilization is the one scoring input you can move in days, and both scorers say lower is better. But the formulas that turn a ratio into points are proprietary, so any tool that promises "+23 points" is inventing the number. This page computes the ratio and quotes the scorers on the direction.
Read sources and limitsHow is credit utilization calculated?
A credit utilization calculator divides each card’s balance by its credit limit and, for the overall ratio, divides the total of all balances by the total of all limits. With $3,000 on a $10,000 limit, $800 on $5,000 and $0 on $3,000, the per-card ratios are 30.0%, 16.0% and 0.0% and the overall ratio is $3,800 ÷ $18,000 = 21.1%.
The overall figure is not the average of the three (15.3%); it is weighted by each card’s limit.
myFICO publishes that "amounts owed" is 30% of a FICO Score and that "using a high percentage of your available credit means you’re close to maxing out your credit cards", which can hurt the score, while "using a low percentage of your available credit can have a positive impact". VantageScore lists total credit usage as its second-ranked factor. Neither publishes the function that turns a ratio into points.
Where does the 30% utilization rule come from?
From consumer guidance, not from a scoring formula. The CFPB’s page on getting and keeping a good credit score says "experts advise keeping your use of credit at no more than 30% of your total credit limit", and VantageScore’s own education page says to "use 30% or less of the total credit available to you".
myFICO’s description of the factor names no percentage at all. That is why the 30% line on this page’s chart is labelled a guideline. The scoring models are continuous, so 29% is not safe and 31% is not a cliff; lower is simply the direction both scorers call favourable. This page does not show a 10% "stretch" figure because neither scorer publishes one.
Does closing a credit card hurt your credit score?
Closing a card removes its limit from your available credit immediately, so if you carry balances elsewhere your overall ratio rises. Closing the $0-balance, $3,000-limit card in the example lifts the overall ratio from 21.1% to $3,800 ÷ $15,000 = 25.3%.
The CFPB warns specifically that closing cards and moving balances onto one card can hurt your score because it raises the share of your limit you are using.
What closing does not do immediately is shorten your credit history. Experian states that a closed account in good standing remains on your credit report for 10 years from the date it was closed. The "once it drops off" figure in the account-age panel is the average after that; the immediate arithmetic risk is the utilization change, not the age.
How are account age and hard inquiries counted?
myFICO puts length of credit history at 15% of a FICO Score and says it considers the age of your oldest and newest accounts and the average age of all accounts. The arithmetic is plain: average age = total months ÷ number of accounts, so a new card enters at 0 months and always lowers the average.
Three cards open 48, 24 and 12 months average 28 months; add a new card and the average is 21 months.
New credit is 10% of a FICO Score. myFICO states that hard inquiries stay on the report for up to two years but "only affect the FICO Scores for a year", that "for most people, one additional credit inquiry will take less than five points off their FICO Scores", and that mortgage, auto and student-loan inquiries inside a 14-day (older score versions) or 45-day (newer versions) window count as one, with inquiries from the 30 days before scoring ignored. This page counts the pulls you enter in the two windows; it does not apply the rate-shopping rule, because it does not know the loan types.
What can a credit score impact calculator not tell you?
It does not predict a score, a point change or an approval. The FICO and VantageScore formulas are proprietary, and the same utilization change moves two files differently. It does not see your payment history (35% of a FICO Score), your credit mix (10%) or any account that is not a card you enter.
Issuers also report at different times — most report the statement balance — so the ratio a bureau sees may not be today’s.
For your actual file, order your free reports from AnnualCreditReport.com, the site the Fair Credit Reporting Act authorises; many card issuers also show a free score. Use this page to plan a payment or a limit request, then check the report.
Credit Score Impact questions
How do I calculate credit utilization?
Divide the balance by the credit limit for one card ($800 ÷ $5,000 = 16.0%), and divide total balances by total limits for the overall ratio: ($3,000 + $800) ÷ ($10,000 + $5,000) = 25.3%. The overall ratio is weighted by limits, so it is not the average of the per-card percentages. Enter every card above to get both.
What is a good credit utilization ratio?
Under 30% is the published guideline: the CFPB says experts advise keeping your use of credit at no more than 30% of your total credit limit, and VantageScore says to use 30% or less of your available credit. It is a planning target, not a scoring threshold — the models are continuous and myFICO names no cut-off; lower is the direction both scorers call favourable.
How much will my credit score go up if I pay off my credit card?
No calculator can say — the FICO and VantageScore formulas are proprietary, so any point figure would be invented. What can be computed is the ratio: a $1,500 payment on an $18,000 total limit lowers overall utilization by 8.3 points (21.1% to 12.8% with the sample cards). myFICO states that using a low percentage of your available credit can have a positive impact; by how much depends on your whole file.
Does closing a credit card hurt your credit score?
It raises your utilization if you carry balances elsewhere, because the closed card’s limit leaves the denominator at once: closing a $0, $3,000-limit card takes the sample ratio from 21.1% to 25.3%. The CFPB warns that closing cards can hurt your score for exactly this reason. The card’s age does not vanish: Experian keeps a closed account in good standing on the report for 10 years.
Does a credit limit increase help my credit score?
It lowers your utilization with no change in what you owe: raising Card 1’s limit from $10,000 to $15,000 takes the sample overall ratio from 21.1% to $3,800 ÷ $23,000 = 16.5%. myFICO says using a low percentage of available credit can have a positive impact. Some issuers run a hard inquiry for the request, which myFICO says costs most people under five points for up to a year.
How many hard inquiries are too many?
There is no published count. myFICO states that for most people one additional inquiry takes less than five points off, that inquiries affect FICO Scores for only a year although they stay on the report for two, and that mortgage, auto and student-loan pulls inside a 14- or 45-day window count as one. The CFPB says hard inquiries from credit applications can affect your score, while checking your own report is a soft inquiry that does not. This page counts your pulls in both windows.
How long do hard inquiries stay on your credit report?
Two years on the report, one year in the score: myFICO says "hard inquiries stay on the report for up to two years, but they only affect the FICO Scores for a year." Enter pulls from the last 12 months and from 13–24 months ago separately in Advanced and the page shows the count in each window.
Does a balance transfer change my credit utilization?
Not the overall ratio — the total balance and total limit are unchanged — but it moves the per-card ratios. Transferring $2,000 from Card 1 ($3,000 on $10,000) to Card 2 ($800 on $5,000) takes Card 1 to 10.0% and Card 2 to 56.0% while the overall stays at 21.1%. myFICO notes that a high percentage of available credit on a card can hurt, so the Transfer tab shows both views.
Does opening a new credit card lower my utilization?
Yes, by adding limit with no balance: a new $5,000 card takes the sample overall ratio from 21.1% to $3,800 ÷ $23,000 = 16.5%. It also enters the average account age at 0 months — three cards averaging 28 months become four averaging 21 — and the application is usually a hard inquiry. The Open card tab shows all three figures.
How can I lower my credit utilization fast?
Three moves show up within a statement cycle: pay before the statement closing date, since most issuers report the statement balance; ask for a credit limit increase, which lowers the ratio without a payment; or spread balances so no single card is far above 30%. Each is arithmetic you can test on the tabs above; which one suits you depends on fees, inquiries and your own file.
Source notes
Method, sources & limitations
Every figure on this page comes from the formula above applied to the values you enter. Nothing is estimated from market data, and no result is a forecast. These are the sources behind the method and any fixed figures it uses:
- myFICO — What’s in my FICO Scores (35 / 30 / 15 / 10 / 10 weights; inquiries scored for 12 months, on the report for two years)
- myFICO — Credit checks: what are credit inquiries and how do they affect your FICO Score (under five points; 14- and 45-day rate-shopping windows)
- CFPB — How do I get and keep a good credit score? (the 30% guideline; closing cards)
- CFPB — What’s a credit inquiry? (hard inquiries can affect your score; checking your own report is a soft inquiry that does not)
- VantageScore — Credit scoring 101: factors that affect your VantageScore credit score (30% or less)
- Experian — When paid accounts are deleted from your credit report (closed accounts in good standing: 10 years)
- AnnualCreditReport.com — the free credit reports authorised by the Fair Credit Reporting Act
Educational information only. Results are estimates produced from the assumptions you enter, and are not financial, tax, legal or medical advice. Check anything that matters against a qualified professional and the cited sources.