A credit score is a number produced by a statistical model that reads your credit report and estimates the likelihood you will fall seriously behind on a debt. That is the whole purpose. It is not a measure of wealth, responsibility or character, and it is not stored on your credit report — it is calculated fresh each time someone requests it.
Where the data comes from
Lenders, card issuers, collection agencies and some other creditors report to three nationwide credit bureaus: Equifax, Experian and TransUnion. Each bureau maintains its own file about you.
Reporting is voluntary. Some creditors report to all three bureaus, some to one, some to none. That is why your three reports rarely match, and why your scores differ from one another.
What the models weigh
FICO publishes the approximate weight of each category in its general-purpose scores:
- Payment history, about 35%. Whether you have paid on time, how late you were, how recently, and how much was involved. This is the largest single factor.
- Amounts owed, about 30%. Mostly credit utilization: how much of your revolving credit limits you are using, both overall and per card.
- Length of credit history, about 15%. The age of your oldest account, your newest, and the average across all.
- New credit, about 10%. Recent applications and newly opened accounts.
- Credit mix, about 10%. Whether you manage both revolving accounts, such as credit cards, and installment accounts, such as auto or student loans.
VantageScore, the other widely used family of models, reads the same reports and reaches similar conclusions by a different route, describing factors by level of influence rather than fixed percentages. Both current FICO and VantageScore consumer models run on a 300 to 850 scale, but the number produced by one is not interchangeable with the other.
Why you have many scores
There is no single credit score. There are:
- Multiple model families, FICO and VantageScore, each with several generations still in commercial use.
- Industry-specific versions, such as auto and bankcard scores, that weight certain behaviors differently.
- Three bureaus, each with slightly different data.
So the score your card app shows you may differ from what a mortgage lender pulls. That is normal and does not mean either is wrong. Free scores are useful for tracking direction over time, not for predicting an exact lender decision.
What is not in your score
By law and by design, credit scores exclude:
- Income, savings and net worth
- Employer and job title
- Race, color, religion, national origin, sex and marital status
- Age, which is excluded from FICO scores
- Whether you use a debit card or pay cash
- Most rent, utility and phone payments, unless a creditor or a rent-reporting service reports them
- Checking or savings account balances
This surprises people who feel financially healthy but have a thin file. The models can only score what is reported.
How long items stay
- Most negative information, including late payments and collections, generally remains for about seven years.
- Chapter 7 bankruptcy generally remains for about ten years.
- Hard inquiries appear for about two years, though FICO scores generally consider them for twelve months.
- Closed accounts in good standing can remain and keep contributing history for years.
Rules around medical debt reporting have changed repeatedly in recent years and have been subject to litigation, so verify the current state of play with the CFPB before assuming a medical collection will or will not appear.
Time is what removes accurate negative information. Nobody can lawfully remove accurate, timely entries early, which is the core problem with credit repair offers that promise otherwise.
Hard and soft inquiries
A hard inquiry happens when you apply for credit, and it can reduce a score slightly. A soft inquiry happens when you check your own report, when a lender prescreens you, or when an existing creditor reviews your account, and it does not affect your score.
Scoring models treat rate shopping sensibly: multiple applications for the same type of loan, such as a mortgage or auto loan, within a short window are generally counted as a single inquiry. The window depends on the model version.
Using this in practice
If you want to act on any of the above, two guides follow directly from it: how to check your credit report, which is where every score conversation should start, and how to improve your credit score, which takes the factors above in order of leverage.
Nobody can guarantee a specific score increase, and any service that does is describing something outside its control. What is predictable is direction: on-time payments and lower utilization move scores up over time, for reasons the weights above make obvious.
Frequently asked questions
What is a good credit score?
On the common 300 to 850 scale, scores are generally grouped as poor below 580, fair 580 to 669, good 670 to 739, very good 740 to 799, and excellent 800 and above, though exact cutoffs vary by lender and model.
Why do I have different credit scores from different sites?
Scores differ because there are multiple model families (FICO and VantageScore), several versions of each, and three bureaus with slightly different data. A free score from one app can legitimately differ from the score a lender pulls.
Does checking my own credit score lower it?
No. Checking your own score or report is a soft inquiry and never affects your score, no matter how often you check.
How often does my credit score update?
There is no fixed schedule. Scores are calculated on demand from whatever is in your credit report at that moment, and your report updates as creditors report new information, typically monthly.
Can I have a credit score with no credit history?
No. Scoring models need some reported activity to calculate a score. With no history, you are considered credit invisible rather than having a low score, and building a thin file is the first step; see how to improve your credit score.
