Your three-digit credit score is one of the most consequential numbers in your financial life. The difference between a 620 and a 760 score on a $300,000 mortgage can cost you $80,000 in additional interest over 30 years. A low score can mean denied apartment applications, higher car insurance premiums in most states, and limited access to the credit you need during financial emergencies.
The good news: credit scores aren't mysterious. FICO, the dominant scoring model used by about 90% of lenders, publishes exactly how scores are calculated. Once you understand the five factors and their weights, you can make targeted decisions that move the needle quickly.
The FICO Score Range and What It Means
FICO scores range from 300 to 850. Lenders categorize these into tiers: below 580 is 'Poor,' 580–669 is 'Fair,' 670–739 is 'Good,' 740–799 is 'Very Good,' and 800+ is 'Exceptional.' The majority of Americans fall between 600 and 750. The national average FICO score reached an all-time high of 718 in 2023, up from 686 in 2010 — evidence that Americans are collectively getting better at credit management.
You actually have dozens of different credit scores — FICO alone has over 50 versions, and VantageScore is a competing model. Mortgage lenders typically use older FICO versions (FICO 2, 4, and 5), while credit card issuers often use FICO 8 or 9. The score you see on free monitoring apps may differ from what a lender pulls, but they're generally directionally consistent.
Factor 1: Payment History (35%)
Payment history is the single most important factor, accounting for 35% of your FICO score. This tracks whether you pay bills on time — credit cards, loans, mortgages, and even some utility and phone bills. A single payment that's 30+ days late can drop your score by 60–110 points, depending on your starting score and credit profile. Higher scores experience more dramatic drops because the scoring model has more 'room' to penalize.
The damage from late payments fades over time — a 5-year-old late payment hurts much less than a recent one. And negative items typically fall off your credit report after 7 years (bankruptcies after 7–10 years). If you have a late payment, the best remedy is time combined with spotless payment behavior going forward. Set up autopay for at least the minimum payment on every account to prevent future late marks.
Factor 2: Credit Utilization (30%)
Credit utilization — the percentage of your available revolving credit (mainly credit cards) that you're using — accounts for 30% of your score. If you have a $10,000 credit limit across all cards and carry a $3,000 balance, your utilization is 30%. The general advice is to stay below 30%, but the people with the best scores typically maintain utilization below 10%.
Utilization is calculated both overall and per card. A single maxed-out card hurts even if your overall utilization is low. Two powerful strategies: ask for credit limit increases (which lowers utilization without changing your balance) and pay your balance in full before your statement closing date — because the balance reported to credit bureaus is typically your statement balance, not your payment date balance.
Factors 3, 4, and 5: Length, Mix, and New Credit
Credit history length (15%) rewards long-standing accounts. The average age of all your accounts and the age of your oldest account both matter — which is why closing old credit cards (even ones you don't use) can hurt your score by shortening your average history.
Credit mix (10%) reflects your variety of credit types: revolving credit (credit cards), installment loans (car loans, mortgages, student loans), and open accounts. Lenders like to see you can manage different types of credit responsibly. You don't need to take on debt you don't need just to improve this factor — it's the least impactful of the five.
New credit (10%) accounts for recent applications. Each hard inquiry (from a credit application) temporarily drops your score by about 5 points. Multiple inquiries within a short window for the same type of loan — like shopping for mortgage rates — are often treated as a single inquiry under FICO's rate-shopping rules (typically a 14–45 day window depending on the FICO version).
How to Improve Your Score Systematically
The fastest legitimate way to improve your score is to fix errors on your credit report. Under the Fair Credit Reporting Act, you're entitled to a free credit report from each of the three bureaus (Equifax, Experian, TransUnion) annually at AnnualCreditReport.com. About 1 in 5 Americans has an error on at least one report — disputing and removing errors can produce immediate score improvements.
Test your knowledge with our Credit Scores & Banking Quiz to see how well you understand credit fundamentals — and spot any gaps that might be holding your score back.