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How Credit Scores Are Calculated

By Credit Factor Editorial Team | AI-assisted, human-reviewed | April 3, 2026

Your credit score is a three-digit number that lenders, landlords, and even some employers use to evaluate your financial reliability. Understanding how this number is calculated can help you make more informed decisions about managing your credit. This guide breaks down the key factors, scoring models, and nuances that typically determine your credit score.

Credit-Factor is not a credit repair company, lender, or financial advisor. This content is for educational purposes only.

What Is a Credit Score?

A credit score is a numerical representation of your creditworthiness, generally ranging from 300 to 850 in the most widely used scoring models. The score is derived from information contained in your credit reports, which are maintained by the three major credit bureaus: Equifax, Experian, and TransUnion. Each bureau may have slightly different information on file, which means your score can vary depending on which bureau’s data is used.

Credit scores are generated by scoring models, the two most prominent being FICO and VantageScore. According to FICO, its scores are used in over 90% of U.S. lending decisions (FICO). VantageScore, developed jointly by the three credit bureaus, has also gained significant adoption, particularly in credit monitoring services.

The Five Key Factors in FICO Score Calculations

The FICO scoring model is the most widely referenced in the lending industry. It weighs five primary categories of credit data, each contributing a different percentage to your overall score (myFICO):

1. Payment History (35%)

Payment history is typically the single most influential factor in your credit score. This category tracks whether you have paid your credit accounts on time. Late payments, collections, bankruptcies, and other derogatory marks can significantly lower your score.

Key details that generally matter in this category include:

  • How many accounts have late payments
  • How far past due the payments were (30, 60, 90, or 120+ days)
  • How recently the late payments occurred
  • The severity of derogatory items (collections, charge-offs, bankruptcies, foreclosures)

A single late payment of 30 days or more can remain on your credit report for up to seven years, according to Experian (Experian). However, its impact on your score generally diminishes over time.

2. Amounts Owed / Credit Utilization (30%)

The second most heavily weighted factor relates to how much of your available credit you are currently using. This is commonly referred to as your credit utilization ratio, calculated by dividing your total revolving balances by your total revolving credit limits.

For example, if you have a total credit limit of $10,000 across all cards and carry a combined balance of $3,000, your utilization ratio is 30%. Most credit experts suggest that keeping utilization below 30% may be beneficial, though consumers with the highest scores typically maintain utilization below 10%, according to Experian data (Experian).

This category also considers:

  • The total amount owed across all accounts
  • The number of accounts carrying balances
  • How much of installment loan balances have been paid down
  • Per-card utilization as well as overall utilization

3. Length of Credit History (15%)

A longer credit history generally works in your favor, as it gives scoring models more data to evaluate your patterns. This factor considers:

  • The age of your oldest account
  • The age of your newest account
  • The average age of all your accounts
  • How long specific account types have been established
  • How long it has been since certain accounts were used

This is one reason why financial educators often suggest keeping older credit accounts open, even if they are rarely used. Closing your oldest account could potentially reduce your average account age and may negatively affect this portion of your score.

4. Credit Mix (10%)

Scoring models typically look at the variety of credit types in your profile. Having experience managing different kinds of credit may indicate to lenders that you can handle various financial obligations. Credit types generally include:

  • Revolving credit: Credit cards, retail store cards, home equity lines of credit
  • Installment loans: Auto loans, student loans, personal loans, mortgages
  • Open accounts: Accounts that must be paid in full each month, such as some charge cards

While having a diverse credit mix may help your score, this factor carries relatively low weight. Opening new accounts solely to diversify your credit mix is generally not advisable, as it could result in hard inquiries and reduced average account age.

5. New Credit / Inquiries (10%)

This category evaluates how frequently you have applied for new credit. Each time you apply for a loan or credit card, the lender typically performs a “hard inquiry” on your credit report. Multiple hard inquiries in a short period may signal to lenders that you are experiencing financial difficulty or taking on excessive new debt.

Important nuances in this category:

  • Hard inquiries generally remain on your credit report for two years but typically only affect your score for about 12 months, according to Equifax (Equifax).
  • Rate shopping for mortgages, auto loans, or student loans is generally treated as a single inquiry if the applications occur within a 14- to 45-day window, depending on the FICO model version.
  • Soft inquiries (such as checking your own credit or pre-approval checks) do not affect your score.

How VantageScore Differs from FICO

While FICO and VantageScore both use a 300-to-850 range (in their most recent versions), they weigh factors somewhat differently. The VantageScore 4.0 model groups its factors into the following categories of influence (VantageScore):

  • Total credit usage, balance, and available credit: Extremely influential
  • Credit mix and experience: Highly influential
  • Payment history: Moderately influential
  • Age of credit history: Less influential
  • New accounts opened: Less influential

Notable differences between VantageScore and FICO include:

  • VantageScore may generate a score with as little as one month of credit history, while FICO generally requires at least six months of credit history and at least one account reported within the last six months.
  • VantageScore 4.0 incorporates trended data, which means it considers the trajectory of your balances over time, not just a snapshot.
  • VantageScore treats paid collections differently. Paid collection accounts generally do not negatively impact a VantageScore, whereas they may still affect some older FICO versions.

What Credit Score Ranges Mean

The following ranges are generally used to categorize FICO scores (myFICO):

  • 800–850 (Exceptional): Borrowers in this range typically qualify for the best interest rates and terms.
  • 740–799 (Very Good): This range generally indicates above-average creditworthiness.
  • 670–739 (Good): This range is considered near or slightly above the average U.S. FICO score, which was 715 as of mid-2024, according to Experian (Experian).
  • 580–669 (Fair): Borrowers may still qualify for credit but often at higher interest rates.
  • 300–579 (Poor): Obtaining traditional credit may be difficult. Secured credit cards or credit-builder loans are common tools used at this range.

Factors That Do NOT Affect Your Credit Score

There are several common misconceptions about what influences credit scores. The following factors are generally not included in FICO or VantageScore calculations:

  • Your income, salary, or employment status
  • Your age, race, gender, religion, marital status, or national origin (protected by the Equal Credit Opportunity Act)
  • Your checking or savings account balances
  • Whether you have been denied credit
  • Rent payments (unless reported to the credit bureaus through a third-party service)
  • Utility payments (unless they go to collections, in which case they may appear as a derogatory item)
  • Soft inquiries, including pre-qualified offers

Why You May Have Different Credit Scores

It is common for consumers to discover they have multiple different credit scores. There are several reasons for this:

Different Scoring Models

There are dozens of different FICO score versions alone (FICO 8, FICO 9, FICO 10, FICO Auto Score, FICO Bankcard Score, etc.), plus multiple VantageScore versions. Each may weigh factors slightly differently. The score you see from a free credit monitoring app may not be the same version a mortgage lender uses.

Different Credit Bureau Data

Not all creditors report to all three bureaus. If one bureau has an account on file that another does not, the resulting scores may differ. This is why checking reports from all three bureaus can be important.

Timing Differences

Creditors report data to the bureaus at different times during the month. A score pulled on one day may reflect a different balance than a score pulled a week later, even from the same bureau.

How Credit Score Calculations Are Changing

Credit scoring is not static. Several recent developments have changed, or are in the process of changing, how scores are calculated:

  • FICO 10 and FICO 10 T: The latest FICO models, including the “T” (trended data) version, were announced in 2020. FICO 10 T considers the trajectory of balances over the previous 24 months, potentially penalizing consumers who consistently increase their balances even if they pay on time. The Federal Housing Finance Agency (FHFA) mandated that FICO 10 T and VantageScore 4.0 will replace older models for mortgages backed by Fannie Mae and Freddie Mac, with implementation expected in the coming years (FHFA).
  • Medical debt changes: All three credit bureaus removed paid medical collection debt from credit reports in 2022, and Equifax, Experian, and TransUnion agreed to remove medical collection debt under $500 (CFPB). Further changes may be on the horizon as regulators continue to address medical debt’s role in credit reporting.
  • Alternative data: Some newer scoring models and services are beginning to incorporate rent payments, utility payments, and bank account data to help consumers with thin credit files build credit histories.

Common Myths About Credit Score Calculations

Myth: Checking your own credit lowers your score.

Checking your own credit generates a soft inquiry, which does not affect your score. Only hard inquiries initiated by lenders when you apply for credit may have an impact.

Myth: Carrying a balance improves your score.

You do not need to carry a balance or pay interest to build credit. Paying your statement balance in full each month is generally sufficient, as the balance reported to the bureaus is typically the statement balance, not the balance after payment.

Myth: Closing old credit cards helps your score.

Closing a credit card may actually hurt your score in two ways: it can reduce your total available credit (increasing your utilization ratio) and may eventually reduce the average age of your accounts.

Myth: All debts are weighted equally.

Scoring models may treat different types of accounts differently. For example, a missed mortgage payment may carry a different weight than a missed credit card payment, and medical collections may be treated differently than other types of collections in newer scoring models.

Practical Steps for Understanding Your Score

While every consumer’s situation is unique, these general steps may help you better understand and monitor how your credit score is calculated:

  1. Review your credit reports regularly. You can access free credit reports from all three bureaus at AnnualCreditReport.com, the only federally authorized source.
  2. Dispute inaccuracies. If you find errors on your credit reports, filing a dispute with the relevant bureau may help correct information that could be unfairly affecting your score.
  3. Understand which score your lender uses. When applying for a mortgage, auto loan, or credit card, asking your lender which scoring model and version they use can help you better interpret your score.
  4. Monitor trends, not just numbers. Since your score can fluctuate from day to day based on reporting cycles, focusing on overall trends over months and years may be more meaningful than reacting to small changes.

Key Takeaways

  • Credit scores are typically calculated using data from your credit reports, weighted across several categories such as payment history, credit utilization, length of credit history, credit mix, and new credit inquiries.
  • FICO and VantageScore are the two dominant scoring models, and they weigh factors differently.
  • You may have many different credit scores depending on the model, version, and bureau data used.
  • Scoring models continue to evolve, with newer versions incorporating trended data and alternative data sources.
  • Understanding these factors does not guarantee a specific score outcome, but it may help you make more informed financial decisions.

This article was created with the assistance of AI and is intended for educational purposes. It does not constitute financial, legal, or credit advice. Consult a qualified financial professional for guidance specific to your situation.

Sources

This content is for educational purposes only. Credit Factor is not a credit repair company, lender, or financial advisor.