Your credit score is different on each site because different companies use different formulas to calculate it from the same raw data
The three major credit bureaus — Equifax, Experian, and TransUnion — collect and store your payment history, debt levels, and other financial information. But they do not calculate your score. Instead, companies like FICO, VantageScore, and individual lenders build their own scoring models using that data. A FICO score and a VantageScore can differ by 50 to 100 points even when they are looking at identical payment records, because they weight factors like recent missed payments, credit mix, and credit age differently.
You may also see different scores because the three bureaus do not always have the same information about you. A late payment might be reported to Equifax but not yet to Experian. A credit card you closed might still appear on one bureau's file but not another's. These gaps mean your Equifax score and Experian score can diverge even when using the same scoring formula.
Key Takeaways
- FICO and VantageScore are the two main scoring models, and they produce different numbers from the same data because they use different formulas and weight different factors.
- The three credit bureaus — Equifax, Experian, and TransUnion — do not always have identical information about you, so your score can vary depending which bureau's data is used.
- Lenders often use industry-specific FICO scores (auto, mortgage, credit card) that differ from the consumer score you see online.
- A score from a free website or app may be a VantageScore or an older FICO version, while a lender checking you for a loan uses a current FICO score.
- Checking your score on multiple sites does not hurt your credit, but applying for credit does, so frequent score-checking is safe but frequent applications are not.
How FICO and VantageScore calculate differently
FICO scores range from 300 to 850. FICO weights payment history at 35 percent, amounts owed at 30 percent, length of credit history at 15 percent, credit mix at 10 percent, and new credit at 10 percent. VantageScore also ranges from 300 to 850 but uses a different weighting: payment history counts for 41 percent, credit utilization for 20 percent, credit age for 20 percent, credit mix for 11 percent, and new credit for 8 percent.
The difference matters most when your situation is uneven — for example, if you have a recent missed payment but a long credit history and low overall debt. FICO's heavier weight on payment history means that miss will hurt more. VantageScore's higher weight on credit age means your long history pulls the score up more. The same financial record produces two meaningfully different numbers.
FICO also produces industry-specific scores for auto loans, mortgages, and credit cards. These versions use the same general approach but adjust the weights to match what matters in that market. A mortgage lender checking you uses a mortgage FICO score, not the consumer FICO score you see on a free website. That is why your score might be 680 on Credit Karma but 710 when a mortgage lender pulls your report.
Why the three bureaus report different information about you
Creditors do not report to all three bureaus at the same time or in the same way. A credit card company might report to Equifax and Experian but not TransUnion. A medical debt collector might report to only one bureau. A late payment might reach Equifax within 30 days but not show up on your Experian file for 60 days. These reporting gaps are normal and legal.
Errors also accumulate unevenly. A wrong account balance might appear on your Experian file but not on Equifax's. A paid-off debt might still show as open on TransUnion. You could have a score of 710 from Equifax, 695 from Experian, and 720 from TransUnion — all based on different versions of your financial history.
When you check your score on a website, you are usually seeing the score from one bureau only. Credit Karma typically shows Equifax and TransUnion scores. Experian's own website shows Experian scores. A lender checking you for a mortgage might pull all three and use the middle score, or might use only one. That is why the number you see at home can be quite different from the number a lender sees.
Free scores versus scores lenders actually use
Most free credit score websites and apps show you a VantageScore, not a FICO score. Lenders — especially for mortgages, auto loans, and credit cards — almost always use FICO. The difference between the two can be 30 to 100 points in either direction. A VantageScore of 750 might correspond to a FICO score of 720, or it might correspond to 780. The relationship is not consistent.
Free FICO scores exist, but they are often older versions. Lenders use FICO 8 or FICO 9 for most credit decisions, but a free FICO score you see online might be FICO 8, FICO 5, or even FICO 2. Older versions weight factors differently, so the number shifts when you move to the version a lender actually uses.
This is why you should not panic if your free score is lower than you expected. It may not be the score that matters for your next loan. When you are about to apply for credit, ask the lender which score they use — FICO or VantageScore, and which version — so you know what to expect.
How recent changes affect each score differently
When you pay down a credit card, miss a payment, or close an account, the three bureaus do not update at the same moment. Equifax might reflect the change within a week, while Experian takes three weeks. Your score on each bureau's data will shift at different times, so you might see your Equifax score jump up while your Experian score is still low.
The two scoring models also react to changes at different speeds. VantageScore can update a score within one or two days of new information arriving. FICO typically takes longer to reflect changes. If you just paid off a large balance, your VantageScore might jump 20 points while your FICO score barely moves yet.
Recent missed payments hurt more in both models, but FICO's heavier weight on payment history means the damage is sharper and lasts longer. A 30-day late payment might drop your FICO score by 100 points but your VantageScore by 60 points. Over time, as the late payment ages, both scores recover, but at different rates.
What score matters for your specific situation
For a mortgage, lenders use FICO scores — usually FICO 5, FICO 2, or FICO 4, depending on the lender. They typically pull all three bureaus and use the middle score. A score of 620 or higher usually opens doors to conventional loans, though rates improve at 740 and above.
For auto loans, lenders also use FICO, often FICO 8 or FICO 9. Credit card companies use FICO 8 or 9 as well. Student loan servicers may use VantageScore or FICO depending on the program. If you are checking your score to prepare for a specific loan, call the lender and ask which score they use. That number is the one that matters.
For general financial health, knowing your FICO score is more useful than knowing your VantageScore, because more lenders use FICO. But neither number is "wrong" — they are just different ways of measuring the same underlying data. A score of 700 on one model and 680 on another does not mean one is a mistake.
How to track your actual score without confusion
Get your free credit report from each bureau once a year at AnnualCreditReport.com. This report shows what information each bureau has on file, but it does not include a score. Checking your report does not hurt your credit and can reveal errors or fraud.
For scores, use one consistent source for tracking. If you pick Credit Karma, check it monthly and watch the trend over time rather than fixating on the exact number. The trend tells you whether your financial behavior is helping or hurting. A VantageScore that rises from 680 to 710 over six months means you are moving in the right direction, even if that number is not the one a lender will see.
When you are about to apply for credit, stop checking your score. Each time you apply, the lender pulls your report, and that pull (called a hard inquiry) can lower your score by a few points. Multiple applications in a short time can drop your score 10 to 20 points. Checking your own score on a website does not trigger a hard inquiry and does not hurt you, so check as much as you want — but limit applications to when you actually need credit.
Frequently Asked Questions
Should I worry if my score is different on three different websites?
Not if the differences are 20 to 50 points. That is normal variation between bureaus and scoring models. If one score is dramatically lower — 100 points or more — check that bureau's credit report for errors or fraud. You can dispute errors for free at the bureau's website.
Which score do I actually need to know?
If you are applying for a mortgage or auto loan soon, ask the lender which score they use. Otherwise, focus on your FICO score because more lenders use it. Your free VantageScore is useful for tracking trends but is not what most lenders see.
Can I improve my score faster on one bureau than another?
No. Improving your score means changing your actual financial behavior — paying on time, lowering debt, not opening new accounts. These changes report to each bureau at different speeds, so your Equifax score might improve before your TransUnion score does, but you cannot target one bureau.
Does checking my credit score hurt it?
Checking your own score on a website does not hurt it. Only hard inquiries from lenders (when you apply for credit) lower your score. Soft inquiries, like checking your own report or a lender pre-screening you, do not affect your score.
Why is my score lower when a lender checks it than when I check it myself?
The lender is probably using a different scoring model or version than the free website you use. They may also be pulling a different bureau's data, or all three bureaus. Ask the lender which score they used so you know what to expect next time.