Your credit score is a three-digit number that quietly shapes much of your financial life in the United States — whether you’re approved for a credit card, the interest rate on a car loan, and even your odds of renting an apartment. Here’s how that number is built, who calculates it, and what actually moves it.
What a credit score actually is
A credit score is a statistical prediction of how likely you are to repay borrowed money. Lenders use it to decide whether to approve you and what interest rate to charge. The higher your score, the lower the risk you appear to be — and the cheaper credit becomes.
Two companies dominate scoring in the U.S.: FICO and VantageScore. Both use a range of 300 to 850, and both pull from the data in your credit reports at the three major bureaus — Experian, Equifax, and TransUnion. You don’t have one score; you have several, and they shift depending on which model and which bureau a lender pulls.
FICO vs. VantageScore: the score ranges
FICO is used in the vast majority of lending decisions, especially mortgages. VantageScore is common in free credit-monitoring apps. The tiers are similar but not identical.
FICO score tiers
- Exceptional: 800–850
- Very Good: 740–799
- Good: 670–739
- Fair: 580–669
- Poor: 300–579
VantageScore uses a wider “Good” band (roughly 661–780), which is why the same person can look slightly different across apps. For most lenders, crossing 670 unlocks meaningfully better terms, and 740+ gets you near the best rates available.
The five factors that build your score
FICO weighs five categories. Understanding the weights tells you exactly where to focus.
1. Payment history — 35%
The single biggest factor. Paying every bill on time, every time, is the foundation of a good score. A single payment that’s 30+ days late can knock off 50–100 points and linger on your report for up to seven years.
2. Amounts owed & credit utilization — 30%
This is mostly your credit utilization ratio: how much of your available revolving credit you’re using. If you have $10,000 in total card limits and a $3,000 balance, your utilization is 30%. Keeping it under 30% — ideally under 10% — helps your score the most.
3. Length of credit history — 15%
Older accounts help. This is why closing your oldest card can actually hurt you, and why becoming an authorized user on an established account can give a thin file a boost.
4. Credit mix — 10%
Lenders like to see you can handle different kinds of credit — revolving (cards) and installment (a personal loan, auto loan, or mortgage). You don’t need to take on debt just for this, but a healthy mix helps.
5. New credit — 10%
Each application triggers a “hard inquiry,” which can ding your score a few points. Opening several accounts in a short window looks risky. Rate-shopping for a single loan within a ~14–45 day window is usually counted as one inquiry.
What’s changing in 2026
Newer models — FICO 10T and VantageScore 4.0 — use trended data, meaning they look at the direction of your balances over the past 24 months, not just a single snapshot. Someone steadily paying balances down now looks better than someone whose debt is creeping up, even at the same utilization today. Under the updated mortgage framework, lenders pull two bureaus and use the lower of the two scores, so consistency across all your reports matters more than ever.
How to check your score for free
You’re entitled to free weekly credit reports from all three bureaus at AnnualCreditReport.com — the only federally authorized source. Many banks and card issuers also show your FICO or VantageScore for free inside their apps. Check your reports for errors (they’re common) and your score to track progress.
Frequently asked questions
Does checking my own score hurt it?
No. Checking your own score is a “soft inquiry” and never affects it. Only a lender’s “hard inquiry” when you apply for credit can.
How fast can I raise my score?
Paying down a high balance can show up within one or two billing cycles. Rebuilding after a serious miss takes longer — on-time payments compound over months. There’s no legitimate overnight fix.
What’s a “good enough” score?
For most credit cards and loans, 670+ opens the door and 740+ gets you the best pricing. Below 580, expect to focus on rebuilding first.
This article is general educational information, not financial advice. Rates and figures cited reflect 2026 U.S. market data and change over time.