A credit score is a three-digit number produced by a statistical model. It answers one narrow question: how likely is this person to become 90 or more days delinquent on a credit obligation in roughly the next two years?
It is not a measure of income, wealth, savings or responsibility in general. Someone with substantial assets and no credit history can have no score at all. Understanding what the number is actually predicting explains most of what people find counterintuitive about it.
The five factors
FICO publishes the approximate weight of each category. The exact contribution varies by individual, because the model weights factors differently depending on the rest of your file.
| Factor | Weight | What it measures |
|---|---|---|
| Payment history | About 35% | Whether you have paid past accounts on time |
| Amounts owed | About 30% | Balances relative to limits — credit utilization |
| Length of credit history | About 15% | How long accounts have been open |
| New credit | About 10% | Recent applications and newly opened accounts |
| Credit mix | About 10% | Whether you manage both revolving and installment credit |
Payment history and amounts owed together account for roughly two-thirds. Everything else is secondary, and any advice that spends most of its time on credit mix has its priorities inverted.
The two factors that matter most
Payment history is the record of whether you paid on time. It weighs severity, recency and frequency: a 90-day delinquency counts more than a 30-day one, last month's counts more than one from four years ago, and a pattern counts more than an isolated event.
A payment is not reported late until it is 30 days past due. Paying a week late costs you a fee, not a credit report entry.
Amounts owed is dominated by credit utilization — your reported revolving balances divided by your total limits. It is calculated both overall and per card, and it responds within a single billing cycle. That makes it by far the fastest lever available.
The three secondary factors
Length of credit history looks at the age of your oldest account, your newest and the average across all of them. It cannot be accelerated, which is the argument for opening a first account early and keeping it.
New credit counts recent applications and newly opened accounts. A hard inquiry typically costs a few points and is generally only counted by scoring models for twelve months, though it remains visible on the report for two years.
Credit mix rewards managing both revolving credit, such as cards, and installment credit, such as auto or student loans. It is worth roughly a tenth of the score and is never a reason to borrow money you do not need.
You have many scores
There is no single credit score. There are three bureaus — Equifax, Experian and TransUnion — and multiple scoring models, each with several versions in active use.
- Different bureaus hold different data, because not every creditor reports to all three.
- FICO and VantageScore use different formulas and produce different numbers on identical data.
- Different FICO versions are used for different purposes, and mortgage lenders commonly use older versions than card issuers.
- Industry-specific scores exist for auto lending and card issuance, on different scales.
A twenty-point difference between two scores you can see is normal and not an error. Watch the trend rather than the absolute number.
Score ranges
Both FICO and VantageScore use a 300–850 range in their most common versions. Lenders set their own thresholds and do not publish them, so these bands are descriptive rather than official.
| Range | Commonly described as |
|---|---|
| 800–850 | Exceptional |
| 740–799 | Very good |
| 670–739 | Good |
| 580–669 | Fair |
| 300–579 | Poor |
Above roughly 760, the practical benefit flattens out. Someone at 780 and someone at 830 will generally receive the same offers, which is worth knowing before optimizing further.
What is not in your score
Credit scores do not include income, savings, employment, age, race, religion, national origin, sex, marital status or where you live. Some of those exclusions are required by federal law.
Lenders may consider income separately during underwriting — a credit card application asks for it — but it is not part of the score itself.
Where to start
- Get your reports from all three bureaus through AnnualCreditReport.com, the federally authorized source, and dispute any errors.
- Set up autopay for at least the minimum on every account. Payment history is the largest factor.
- Pay balances down before statements close so lower figures are reported.
- Stop opening new accounts for six months if you are preparing for a mortgage or auto loan.
- Wait. Credit history length and the fading of past problems are functions of time, not effort.
