Credit Karma vs. Experian: 2 Scoring Models, 2 Different Numbers

Credit Karma shows one credit score built on the VantageScore 3.0 model, drawing data from two credit bureaus, TransUnion and Equifax, according to an explainer Credit Karma published comparing its score to Experian's. Experian shows a different score, calculated from the FICO Score 8 model using only Experian's own credit file. The two services routinely display different numbers for the same consumer because they run different formulas on different source data, not because either platform is malfunctioning.

Why Credit Karma and Experian Scores Differ

The gap between a Credit Karma score and an Experian score traces to two separate variables: the scoring model and the data feeding it. Credit Karma relies on VantageScore 3.0, a model built jointly by the three major bureaus as an alternative to the FICO formula that has dominated lending decisions for decades. Experian's consumer-facing score instead uses a FICO Score 8 calculation applied strictly to Experian's own file. Because VantageScore and FICO weigh factors like payment history, credit utilization, and account age with different formulas, the same underlying credit behavior can produce two different three-digit outputs.

Which Credit Bureaus Feed Each Score

Data source compounds the model difference. Credit Karma pulls from TransUnion and Equifax, meaning its score reflects whatever those two bureaus have on file. Experian's score reflects only what Experian itself has recorded. Lenders do not always report account activity to every bureau on the same schedule, so a payment, a new account, or a credit limit change can show up in one bureau's file before it appears in another. A consumer checking both services on the same day can be looking at scores built from slightly different underlying records, independent of the scoring formula itself.

Whether One Score Is More Accurate Than the Other

Neither score functions as a universal predictor of what a lender will see at the point of application. Mortgage lenders, auto lenders, and credit card issuers each choose which bureau and which scoring model to pull, and many use older or industry-specific versions of FICO that differ from both the Credit Karma and Experian consumer displays. The practical answer, per Credit Karma's own comparison, is that both scores are legitimate representations of a consumer's credit standing as measured by their respective models and data sets, but neither one is guaranteed to match the exact score a lender pulls during underwriting.

Why Consumers Say Credit Scores Feel Confusing

The discrepancy between free score services adds to a broader pattern of consumer unease. A survey covered separately by HTT News found a negative perception of credit scores among respondents in San Francisco, underscoring that confusion over how scores are built and why they shift between platforms is not isolated to a single app or bureau. When two free, reputable tools display different numbers for the same person, the natural reaction is to question which one, if any, to trust.

How to Use Both Scores Without Overreacting

Financial counselors generally advise treating free credit-monitoring scores as directional indicators rather than fixed benchmarks. A score moving up or down by a meaningful margin on either platform still signals a real change in credit behavior, such as a missed payment or a drop in available credit, even if the exact number will not match what a specific lender calculates. Consumers preparing for a major application, such as a mortgage, are better served pulling the specific score version and bureau the lender plans to use, information most loan officers will disclose on request, rather than relying solely on Credit Karma or Experian's consumer-facing numbers as a stand-in.

Data Box

• Credit Karma score model: VantageScore 3.0, sourced from 2 bureaus (TransUnion and Equifax), per Credit Karma's explainer.
• Experian score model: FICO Score 8, sourced from 1 bureau (Experian's own file), per the same comparison.

The takeaway for consumers checking both apps side by side is straightforward: a different number does not mean one service got it wrong. It means two different formulas looked at two different sets of records and did their jobs.