How Credit Scores Are Calculated: FICO vs VantageScore

You check your credit score in your banking app and see one number. A credit card site shows another. Then a mortgage lender quotes a third. None of them are wrong. They are simply different calculations built from slightly different data.

Understanding how credit scores are calculated takes the mystery out of those numbers and shows you where your effort pays off. This guide breaks down the factors in the 2 main scoring families, FICO and VantageScore, how much each factor counts and why your scores rarely match.

Credit reports vs credit scores

Your credit report is a record of your credit accounts and payment behavior, kept by the 3 nationwide credit bureaus: Equifax, Experian and TransUnion. It lists your credit cards and loans, balances, credit limits, payment history, collections, public records such as bankruptcies and inquiries from lenders.

Your credit score is a 3-digit number calculated from one of those reports by a scoring model. The bureaus hold the data; companies such as FICO and VantageScore build the formulas. A score is a snapshot. It changes whenever the underlying report changes.

Key point: the score does not use your income, savings, job, age, race, religion, marital status or address. Those are not part of the credit scoring formula, though lenders may consider income and other factors separately when they decide whether to approve you.

How FICO scores are calculated

FICO scores are the most widely used by lenders. According to myFICO, the base scores range from 300 to 850 and are built from 5 categories:

FICO notes that these weights are general. The importance of each category varies from person to person, especially for people with short credit histories.

Payment history (35%)

This is the single biggest factor. A payment that is 30 or more days late can be reported and can drop your score noticeably. The later the payment, the more recent it is and the more often it has happened, the bigger the effect. The good news is that the impact fades with time if you keep paying on time.

Amounts owed (30%)

Credit utilization is the share of your credit card limits you are using. If you have $10,000 in total limits and $3,000 in balances, your utilization is 30%. Lower is generally better. Because scores use the balance reported on your statement, paying down cards before the statement closes can lower your reported utilization. Utilization has no memory in many models, so it can improve quickly once balances drop.

Length of credit history (15%)

Older accounts help. Closing your oldest card can shorten your history and also reduce your total available credit, which raises utilization. If an old card has no annual fee, keeping it open and using it lightly often helps.

New credit (10%)

Opening several accounts in a short time can signal risk. Each application for new credit usually creates a hard inquiry. According to myFICO, hard inquiries stay on your report for up to 2 years, but FICO scores only consider them for 1 year. When you shop for a mortgage, auto or student loan, FICO groups multiple inquiries within a window of 14 to 45 days, depending on the score version, and counts them as 1. Checking your own credit is a soft inquiry and does not affect your score.

Credit mix (10%)

Having both cards and installment loans can help slightly. It is not worth taking on a loan just to improve your mix.

How VantageScore is calculated

VantageScore was created by the 3 credit bureaus and is common in free credit score apps and some lending. VantageScore 3.0 and 4.0 also range from 300 to 850. VantageScore 4.0 uses the same kind of data but groups and weights it differently:

VantageScore 4.0 also uses trended data, which looks at whether your balances are rising or falling over time rather than only at a single month. VantageScore says it can score more people with thin credit files than traditional models, because it requires less history to produce a score.

In July 2025, the Federal Housing Finance Agency said lenders could use VantageScore 4.0 for mortgages sold to Fannie Mae and Freddie Mac, alongside Classic FICO. The rollout has continued in stages, so mortgage lenders may use either model.

Key takeaway: FICO and VantageScore reward the same habits. Pay every bill on time, keep card balances low relative to your limits, keep older accounts open and apply for new credit only when you need it. Those 4 habits drive most of your score in every model.

Why your credit scores are different

It is normal to have several different scores at the same time. Here is why:

1. Different bureaus, different data. Not every lender reports to all 3 bureaus, and they report on different days. Your Experian report might show a balance your TransUnion report does not yet have.
2. Different models. A FICO score and a VantageScore weigh the same data differently.
3. Different versions. There are many FICO versions in use. Mortgage lenders have long used older FICO versions, while card issuers may use newer ones. Industry-specific scores, such as FICO Auto Scores and Bankcard Scores, use a wider range of 250 to 900.
4. Different timing. A score pulled today and one pulled last week may reflect different statement balances.
5. Educational vs lender scores. Some apps show educational scores or one specific model, which may not be the score your lender uses.

So do not chase a single number. Watch the trend across several scores and focus on the habits behind them.

What changes and what does not

On medical debt: since July 2022 the 3 bureaus no longer report paid medical collections, and since April 2023 they no longer report medical collections with an initial balance under $500. A broader CFPB rule to remove medical bills from credit reports was vacated by a federal court in July 2025. Some states have their own limits. This is not legal advice.

Where to start: check and improve your credit

1. Get your free reports. The 3 bureaus have permanently extended free weekly reports through AnnualCreditReport.com, the only site authorized for free reports under federal law.
2. Check for errors. Look for accounts you do not recognize, wrong late payments and incorrect balances. Dispute errors directly with the bureau. Unfamiliar accounts may signal identity theft; see how to protect yourself from identity theft.
3. Set up autopay for at least the minimum on every account, so you never miss a payment.
4. Lower your utilization. Pay down card balances, or pay before the statement date. A budget app helps find the cash, and canceling forgotten subscriptions frees up more.
5. Space out applications. Apply only when you need credit, and rate-shop for loans within a short window.
6. Consider freezing your credit. A freeze at all 3 bureaus is free and blocks new accounts in your name without affecting your score. It is a smart step after any data breach, as covered in what to do after a data breach.

Watch out for credit repair offers that promise to remove accurate negative information. No one can legally do that, and paying upfront for credit repair is a common scam. Our guide on what to do if you got scammed can help if you have already paid.

How AI and new data are changing scoring

Lenders increasingly use machine learning models and new data sources, such as bank account cash flow and rent payments, alongside traditional scores, especially for people with thin credit files. Some of this data reaches you only if you opt in or if a service reports it to the bureaus. Our guide to AI in banking and finance covers how lenders use these tools and the fairness questions they raise.

Conclusion

Credit scores look mysterious, but the formulas are built on a few predictable factors. Payment history and how much of your credit you use matter most in both FICO and VantageScore. Your scores differ because bureaus, models and versions differ, so focus on the trend and the habits rather than any single number. Check your reports regularly, fix errors and let time and on-time payments do the rest. This is general information, not financial advice.

Sources

• myFICO: What’s in my FICO Scores? — the 5 FICO factors and their weights
• myFICO: Credit checks and inquiries — hard and soft inquiries and the rate-shopping window
• VantageScore: The complete guide to your VantageScore 4.0 credit score — VantageScore 4.0 factors and weights
• CFPB: How long does information stay on my credit report? — reporting time limits for negative information
• FTC: Free credit reports — free weekly reports through AnnualCreditReport.com
• Experian: Equifax, Experian and TransUnion remove medical collections debt under $500 — 2022 and 2023 medical debt reporting changes