How Credit Scores Work: Everything You Need to Know

What Is a Credit Score and Why Does It Matter?

A credit score is a three-digit number (300–850) that summarizes your creditworthiness — your statistical likelihood of repaying borrowed money on time. Lenders, landlords, insurance companies, and even some employers use it as a proxy for financial reliability.

The numbers have real financial consequences. The difference between a 620 and a 760 FICO score on a $300,000 30-year mortgage is roughly $200/month — over $72,000 in additional interest paid over the life of the loan. Keys, Mukherjee, Seru & Vig (2010), in their analysis of subprime lending published in the Quarterly Journal of Economics, showed that measured creditworthiness genuinely predicts repayment behavior — meaning the score reflects something real, not just arbitrary lender gatekeeping.

For most people, understanding and improving their credit score is one of the highest-leverage financial moves available.

Credit Score Ranges: What They Mean

FICO — the most widely used scoring model — uses these ranges.

The 5 Factors That Make Up Your Credit Score

FICO breaks your score into five categories, each weighted differently. Understanding this breakdown reveals exactly how to improve your score.

How to Improve Your Credit Score

Credit improvement is straightforward, but it rewards patience over shortcuts. The two levers that move scores fastest are also the two that compound over time: payment history and utilization. Here's a prioritized action plan that addresses both.

• •1. Pay every bill on time, every month — set up autopay for at least the minimum, then clear the rest manually before the due date
• •2. Pay down revolving balances aggressively — target below 30% utilization per card, ideally below 10%; this factor updates every billing cycle
• •3. Pull your free credit reports at AnnualCreditReport.com and dispute any errors — the CFPB estimates errors appear on roughly 1-in-5 consumer reports
• •4. Become an authorized user on a family member's old, well-managed card to inherit its positive payment history
• •5. Don't close old accounts — average age of accounts is 15% of your score, and closing a card doesn't erase its history immediately
• •6. Space out new credit applications — hard inquiries stay on your report for two years, and clustered applications signal financial stress to scoring models
• •7. Use a secured credit card or credit-builder loan if you're starting with thin credit — consistent on-time payments are the fastest path from no history to good history