FICO scores range from 300 to 850 and determine your access to credit and interest rates. Learn how FICO scores are calculated, what the 5 factors mean, and proven ways to improve your score fast.
Your FICO score is the three-digit number that determines whether you get approved for a credit card, mortgage, or auto loan — and at what interest rate. Created by the Fair Isaac Corporation in 1989, the FICO score is used by 90% of top lenders in the United States. Understanding how it works is the first step toward improving it.
This guide covers everything you need to know: how FICO scores are calculated, what each range means for your borrowing power, the difference between FICO 8 and FICO 9, and seven proven strategies to raise your score.
FICO scores are divided into five tiers. Where you fall determines not just whether you're approved — but the interest rate you'll pay for years or decades.
| Score Range | Rating | % of Americans | Typical Mortgage APR Impact |
|---|---|---|---|
| 800 – 850 | Exceptional | ~23% | Best available rates; may qualify for lowest-tier pricing |
| 740 – 799 | Very Good | ~25% | Near-best rates; typically 0.1–0.3% above top tier |
| 670 – 739 | Good | ~21% | Approved for most products; rate ~0.5–1% above exceptional |
| 580 – 669 | Fair | ~17% | Limited options; rate 1.5–3% higher; FHA loans still available |
| 300 – 579 | Poor | ~14% | Most conventional lenders will decline; secured cards and credit-builder loans only |
To put the rate differences in dollar terms: on a $350,000 30-year mortgage, moving from a "fair" score (620) to a "very good" score (760) can reduce your monthly payment by $300–$450 and save you $100,000+ in total interest paid.
FICO uses five weighted factors to calculate your score. Each factor carries a different weight — knowing this helps you prioritize where to focus your improvement efforts.
This is the most important factor by a wide margin. It tracks whether you pay your bills on time across all your accounts — credit cards, mortgages, auto loans, student loans, and even some utility bills. A single 30-day late payment can drop your score by 60–110 points depending on your starting score. Payments more than 90 days late cause even greater damage. The higher your starting score, the larger the point drop from a missed payment — the algorithm penalizes those who "should know better."
This factor measures how much of your available revolving credit you're using — your credit utilization ratio. If you have $10,000 in total credit card limits and carry a $3,000 balance, your utilization is 30%. FICO rewards people who use less of their available credit. Staying below 30% is the standard advice, but below 10% is even better for top scores. This factor responds quickly — pay down a balance and your score can improve within one reporting cycle (typically one month).
FICO considers the age of your oldest account, your newest account, and the average age of all your accounts. Longer history signals experience managing credit. This is why it generally hurts to close old accounts — doing so can lower your average account age. If you're new to credit, patience is the primary remedy; this factor improves automatically over time.
Lenders prefer to see that you can manage different types of credit responsibly. A healthy credit mix typically includes revolving accounts (credit cards, HELOCs) and installment loans (mortgage, auto loan, student loan, personal loan). You don't need one of every type, and you should never take on debt you don't need just to improve this factor — the benefit is too small to justify the cost.
Each time you apply for new credit, the lender performs a hard inquiry on your credit report, which can lower your score by 5–10 points temporarily. Multiple applications in a short window look risky to lenders. The exception: FICO's rate-shopping window. If you're shopping for a mortgage or auto loan, multiple hard inquiries within a 14–45 day period (depending on the FICO version) count as just one inquiry.
Not all credit scores are the same. Lenders use different score versions, which can produce meaningfully different numbers from the same underlying credit data.
| Feature | FICO Score 8 | FICO Score 9 | VantageScore 4.0 |
|---|---|---|---|
| Released | 2009 | 2014 | 2017 |
| Most Common Use | Most widely used by lenders today | Growing adoption; used by some mortgage lenders | Used by many free score services (Experian, TransUnion) |
| Medical Debt | Counts the same as other collections | Weighted less; paid medical collections ignored | Weighted less significantly |
| Paid Collections | Still counts against you even if paid | Paid collections ignored entirely | Paid collections ignored |
| Rent & Utility History | Not included | Not included | Can be included if reported |
| Thin File Scoring | Requires at least one account 6+ months old | Requires at least one account 6+ months old | Can score with as little as 1 month of history |
| Authorized User Boost | Limited; ignores "piggybacking" | Similar to FICO 8 | Considered but trended data reduces gaming |
Negative marks don't last forever — federal law (the Fair Credit Reporting Act) sets maximum reporting periods for most derogatory items. Their impact also diminishes significantly before they fall off.
Checking your own credit score hurts your FICO score.
Checking your own score is a soft inquiry and has zero impact on your FICO score. Only hard inquiries from lenders during applications can affect your score. Check your score as often as you want.
Closing old credit cards will improve your score.
Closing old accounts typically hurts your score. It reduces your total available credit (raising utilization) and shortens your average account age. Unless there's a compelling reason to close an account (high annual fee, temptation to overspend), keeping it open is usually better for your score.
Carrying a small credit card balance each month builds credit.
You do not need to carry a balance to build credit. Paying your statement balance in full each month reports as on-time payment activity and keeps your utilization low. Carrying a balance only means you pay interest — it provides no scoring benefit.
Your income and employment status affect your FICO score.
FICO scores are based entirely on your credit report data — which does not include your income, employment history, job title, or savings account balances. These factors may affect whether a lender approves you, but they are not part of the FICO score calculation.
Paying off a collection account will remove it from your credit report.
Under standard FCRA rules, a paid collection account remains on your report for 7 years. However, under FICO Score 9 and VantageScore 4.0, paid collections carry less weight. Some collectors will agree to a "pay for delete" arrangement in writing — but this is not guaranteed, and the major bureaus discourage it. Your best option with old collections is often debt validation, especially for accounts approaching the statute of limitations.
A credit repair company can legally remove accurate negative items.
No company can legally remove accurate, verifiable negative information from your credit report. The FCRA protects the right to dispute inaccurate information — and you can do this yourself for free. Many credit repair companies charge hundreds of dollars for services you can do at no cost. Be wary of any company that guarantees results or asks for upfront payment.
You shouldn't have to pay to see your own FICO score. Multiple legitimate sources offer free access — some offer the actual FICO score, others offer VantageScore (which is still useful for tracking trends).
Under the FDCPA, debt collectors must validate any debt you dispute. Many old collection accounts can't be verified — and may be removed. Our free tool generates a professional debt validation letter in minutes.
Generate Free Validation Letter →This article is for informational purposes only and does not constitute financial or legal advice. FICO scoring models and credit reporting rules can change. For advice specific to your situation, consult a certified credit counselor or financial advisor.