What Is a FICO Score? The Complete Guide

A FICO® score is a three-digit number between 300 and 850 that predicts how likely you are to pay back borrowed money. It's calculated from the information in your credit report, and 90% of top U.S. lenders use FICO scores when making credit decisions, according to Fair Isaac Corporation (the company that created the score).

That number affects whether you get approved for a credit card, mortgage, auto loan, or apartment lease. It also determines the interest rate you're offered, which can mean tens of thousands of dollars saved or lost over the life of a loan.

This guide covers how the score is built, what the five scoring factors are, how it's different from other credit scores, and how to actually check yours.

Who Created the FICO Score?

The FICO score was developed by Fair Isaac Corporation, founded by engineer Bill Fair and mathematician Earl Isaac in 1956. The company introduced the first general-purpose credit scoring system in 1989, working with Equifax. By the mid-1990s, all three major credit bureaus (Experian, TransUnion, and Equifax) had adopted FICO-based scoring.

Before FICO scores existed, loan decisions were based almost entirely on a loan officer's judgment. That process was slow, inconsistent, and open to bias. The scoring model standardized credit evaluation by distilling a person's credit history into a single number that could be compared consistently across millions of applications.

Fair Isaac Corporation rebranded to FICO in 2009 and is publicly traded on the NYSE under the ticker symbol FICO.

How Is a FICO Score Calculated?

FICO scores are calculated using five categories of information from your credit report. Each category carries a different weight in the overall score, according to myFICO.com:

Payment History (35%)

This is the single biggest factor. It tracks whether you've paid your credit accounts on time. Late payments, collections, bankruptcies, and other negative marks all show up here.

A single payment reported as 30 days late can drop your score significantly, and the impact is worse if the payment is 60 or 90+ days late. More recent late payments hurt more than older ones. A late payment from five years ago has less impact than one from five months ago.

What counts: on-time payments on credit cards, mortgages, auto loans, student loans, and retail accounts. Also includes public records like bankruptcies and whether any accounts have been sent to collections.

Amounts Owed (30%)

This measures how much of your available credit you're currently using. The key metric here is your credit utilization ratio: the percentage of your total credit limit that you have as outstanding balances.

If you have a credit card with a $10,000 limit and a $3,000 balance, your utilization on that card is 30%. FICO looks at both individual card utilization and your overall utilization across all revolving accounts.

Lower utilization is better. People with the highest FICO scores tend to use less than 10% of their available credit. The general guideline is to stay under 30%, but there's no hard cutoff. Having some utilization is actually better than having 0% across all accounts, because it shows you're actively using credit responsibly.

Having balances on installment loans (mortgages, auto loans, student loans) is considered differently than revolving credit card debt. Paying down installment loan balances over time as scheduled is expected behavior and doesn't penalize you the way high credit card balances do.

Length of Credit History (15%)

Longer credit histories generally produce higher scores, because lenders have more data to evaluate. FICO considers:

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

This is why closing old credit card accounts can hurt your score. When you close your oldest card, you eventually lose that account's age from the calculation, which shortens your average account age.

You don't need decades of credit history to have a good score. But all else being equal, someone with 10 years of clean credit history will typically score higher than someone with two years.

Credit Mix (10%)

FICO scores reward having a variety of credit types. Lenders want to see that you can handle different kinds of credit responsibly. The main categories are:

• Revolving credit: Credit cards, store cards, home equity lines of credit (HELOCs)
• Installment loans: Mortgages, auto loans, student loans, personal loans

You don't need one of every type. Having a mix of revolving and installment accounts is enough. This factor has a relatively small weight, so don't open accounts you don't need just to diversify your credit mix.

New Credit (10%)

This factor looks at how many new accounts you've recently opened and how many hard inquiries appear on your report. Opening several new credit accounts in a short period can signal risk to lenders, especially if you don't have a long credit history.

A hard inquiry happens when a lender pulls your credit report because you've applied for credit. A single hard inquiry typically has a small impact (usually less than five points, according to Experian) and falls off your report after two years.

FICO scoring models recognize rate shopping. If you're applying for a mortgage or auto loan, multiple inquiries from the same type of lender within a 14- to 45-day window (depending on the FICO model version) are treated as a single inquiry. This lets you compare offers without getting penalized.

Soft inquiries, like checking your own credit, employer background checks, or pre-approved offers, do not affect your score at all.

FICO Score Range: 300 to 850

FICO scores fall on a scale from 300 (worst) to 850 (best). Here's how FICO categorizes the ranges, as published on myFICO.com:

According to Experian's data, the average FICO score in the United States has hovered around 715 in recent years. That puts the national average solidly in the "Good" range.

For a deeper breakdown of what each range means for loans, cards, and interest rates, see our FICO Score Ranges guide.

FICO Score Versions

There isn't just one FICO score. Fair Isaac Corporation has released multiple versions of the scoring model over the years, and different lenders use different versions depending on the type of credit being evaluated.

General-Purpose Scores

• FICO Score 8 is the most widely used version across all lending types. It was introduced in 2009 and is used by all three credit bureaus.
• FICO Score 9 (2014) ignores paid collection accounts entirely and treats medical debt collections differently than other collections.
• FICO Score 10 and 10 T (2020) are the latest versions. FICO 10 T uses "trended data," which looks at your credit behavior patterns over the past 24 months rather than a single snapshot. This means lenders can see whether your balances are going up or down over time.

Industry-Specific Scores

FICO also creates scores tailored for specific lending decisions:

• FICO Auto Score: Built specifically for auto lending decisions. Versions include FICO Auto Score 2, 4, 5, 8, 9, and 10.
• FICO Bankcard Score: Built specifically for credit card decisions. Versions include FICO Bankcard Score 2, 4, 5, 8, 9, and 10.
• Mortgage scores: The Federal Housing Finance Agency currently requires mortgage lenders using Fannie Mae and Freddie Mac to use specific older FICO versions: FICO Score 2 (Experian), FICO Score 5 (Equifax), and FICO Score 4 (TransUnion). There has been an ongoing transition to require FICO 10 T and VantageScore 4.0 for mortgage lending.

Industry-specific scores use a wider range of 250 to 900, compared to the standard 300 to 850.

The version matters because the same credit report can produce different scores depending on which model is applied. This is one reason the free score you see on your credit card statement might not match the score a mortgage lender pulls.

FICO Score vs. VantageScore

FICO isn't the only credit scoring system. VantageScore is the main competitor, created jointly by Experian, TransUnion, and Equifax in 2006.

Key differences:

• Market share: FICO scores are used by 90% of top lenders, according to FICO. VantageScore is gaining adoption but is more commonly used in free consumer-facing score products than in actual lending decisions.
• Scoring minimums: FICO requires at least one account open for six months and at least one account reported to a bureau in the last six months. VantageScore can generate a score with just one month of credit history and at least one account reported within the past 24 months.
• Factor weights: Both systems use similar categories (payment history, utilization, age, mix, inquiries) but weight them differently. VantageScore groups payment history and age together as most influential.
• Collections treatment: VantageScore 3.0+ ignores paid collections. FICO Score 8 still counts them (though FICO 9+ also ignores paid collections).
• Range: Both use a 300-850 range for their current versions.

When you see a "free credit score" on a banking app or monitoring service, check whether it's a FICO score or a VantageScore. The number can differ by 20 points or more from the same report. If you're preparing for a major loan application, knowing which scoring model your lender uses helps you avoid surprises.

For a detailed comparison, see our FICO Score vs. Credit Score guide.

What a FICO Score Does NOT Include

FICO scores are strictly based on credit report data. According to FICO, the following are never factored into your score:

• Your race, color, religion, national origin, sex, or marital status (prohibited by the Equal Credit Opportunity Act)
• Your age
• Your salary, occupation, title, employer, or employment history
• Where you live
• Any interest rate being charged on a particular account
• Child/family support obligations
• Whether you're participating in credit counseling
• Any information not found in your credit report

Your income is not in your FICO score. Someone earning $30,000 a year with perfect payment history and low utilization can have a higher score than someone earning $300,000 with late payments and maxed-out cards.

How to Check Your FICO Score

There are several ways to see your FICO score, and some of them are free:

Free Through Your Bank or Credit Card Issuer

Many major banks and credit card companies provide free FICO score access as a cardholder benefit. Discover, American Express, Bank of America, Chase, Citi, and Wells Fargo all offer some form of free FICO score monitoring. Check your card's online dashboard or mobile app.

Free Credit Reports (But Not Always Scores)

You're entitled to one free credit report per year from each of the three bureaus through AnnualCreditReport.com, the only federally authorized source. These reports show the detailed information used to calculate your score, but they don't always include the score itself. Still, reviewing your reports regularly is critical for catching errors.

The Consumer Financial Protection Bureau (CFPB) recommends checking your credit report at least once a year, and more often if you're planning to apply for a major loan.

Paid Options

myFICO.com is the only place where you can purchase your official FICO scores from all three bureaus for all available scoring models. This is useful when you want to see the specific scores a mortgage lender or auto lender will pull.

Important: Checking Your Own Score Does NOT Hurt It

When you check your own credit score or credit report, that's a soft inquiry. Soft inquiries have absolutely no effect on your FICO score. This is confirmed directly by Fair Isaac Corporation. Don't let fear of a score drop prevent you from monitoring your credit.

For step-by-step instructions, see our How to Check Your FICO Score for Free guide.

Why Your FICO Score Changes

Your score is a snapshot, not a permanent number. It recalculates every time a lender requests it, based on whatever information is currently in your credit report at that moment. Common reasons your score changes:

• A payment was reported late (or on time): Payment history is 35% of your score, so payment status changes have the biggest effect.
• Your credit card balances changed: If you paid down a balance or charged more, your utilization shifts.
• You opened or closed an account: New accounts affect average age and new credit factors.
• A hard inquiry was added: A new credit application creates a hard inquiry.
• A negative item aged or fell off: Negative items lose impact over time and are removed after seven years (10 for bankruptcies).
• A reporting error appeared or was corrected: Errors are more common than most people realize.

Small fluctuations of a few points from month to month are normal and not cause for concern. Large, sudden drops usually indicate a specific event like a late payment being reported or a collection account appearing.

How FICO Scores Affect Your Finances

The real-world impact of your FICO score is financial. Here's how it plays out:

Mortgage Interest Rates

Even a small score difference can cost thousands over a 30-year mortgage. According to data published by myFICO's loan savings calculator, the difference between a 620 score and a 760+ score on a $300,000 30-year fixed mortgage can mean paying over $100,000 more in total interest over the life of the loan.

Credit Card Approval and APR

Higher scores qualify you for cards with better rewards, lower APRs, and higher limits. Scores below 670 typically limit you to secured cards or subprime products with annual fees and high interest rates.

Auto Loan Rates

Auto lenders use FICO Auto Scores. Higher scores mean lower APRs. According to Experian data, borrowers with scores above 780 receive average auto loan APRs well below those offered to borrowers in the 580-669 range.

Apartment Rentals

Many landlords and property management companies run credit checks on prospective tenants. A low score can result in application denial or a requirement to pay a larger security deposit.

Insurance Premiums

In most states, auto and home insurance companies use credit-based insurance scores (which are derived from credit data, though not identical to FICO scores) to help set premiums. California, Hawaii, and Massachusetts have restricted this practice for auto insurance.

Employment

Some employers check credit reports (not scores) as part of background screening, particularly for positions involving financial responsibility. This is regulated by the Fair Credit Reporting Act and requires your written consent.

Minimum Requirements for a FICO Score

Not everyone has a FICO score. To generate one, your credit report must meet these minimum criteria, according to FICO:

• At least one account that has been open for six months or longer
• At least one account that has been reported to the credit bureau within the past six months
• No indication that you are deceased on the credit report (this can happen due to reporting errors)

The two requirements can be satisfied by the same account. If you're new to credit, the fastest way to become scorable is to open a credit card or become an authorized user on someone else's account.

People without enough credit history to generate a score are sometimes called "credit invisible." The CFPB estimates that roughly 26 million Americans are credit invisible (having no credit file at all), and another 19 million have files that are unscorable.

Frequently Asked Questions

What is a good FICO score?

A FICO score of 670 or above is considered "Good" by FICO's own rating system. Scores of 740-799 are "Very Good" and 800+ are "Exceptional." The most favorable loan terms and interest rates are typically reserved for scores of 740 and above, though every lender sets its own thresholds.

How often does my FICO score update?

Your FICO score recalculates every time it's requested by a lender or by you. It's based on the data in your credit report at that moment. Most creditors report to the bureaus once a month, so your score can shift monthly as new data flows in.

Can I have different FICO scores at the same time?

Yes. You have multiple FICO scores because each of the three credit bureaus maintains a separate credit file, and each file can be scored using different FICO model versions. It's not unusual to have a different score from Experian, TransUnion, and Equifax, and for each bureau to have multiple versions (FICO 8, FICO 9, FICO Auto Score, etc.) that produce different numbers.

Does checking my credit hurt my score?

No. Checking your own credit report or score is a soft inquiry and has zero effect on your FICO score. Only hard inquiries from credit applications affect your score, and even those typically cause a small, temporary drop.

How long does it take to build a FICO score from scratch?

You need at least six months of credit account history to generate a FICO score. Opening a secured credit card or becoming an authorized user on someone else's card are the most common ways to start building credit.

What is the highest possible FICO score?

The highest possible FICO score is 850. While achieving a perfect 850 is rare, any score above 800 is considered "Exceptional" and qualifies you for the best rates and terms available. There is no practical benefit difference between an 830 and an 850.

Sources: Fair Isaac Corporation (myfico.com), Consumer Financial Protection Bureau (consumerfinance.gov), Experian (experian.com), AnnualCreditReport.com

This content is for educational purposes only and is not financial advice. See our financial disclaimer for details.