What is a Credit Score?

A credit score is a three-digit number — typically ranging from 300 to 850 — that represents your creditworthiness. Lenders use it to decide whether to approve your loan application and at what interest rate. The higher your score, the lower the risk you represent to lenders, and the better the terms you receive.

Credit scores affect far more than just loans. Landlords check credit before renting apartments. Employers in some industries run credit checks. Insurance companies in many states use credit data to set premiums. Your credit score is one of the most consequential numbers in your financial life.

The real cost of a low credit score:

Consider a $350,000 30-year mortgage:

A 100-point difference in credit score can cost over $80,000 on a single mortgage. Across a lifetime of car loans, mortgages, and credit cards, the difference between excellent and poor credit runs into the hundreds of thousands of dollars.

FICO Score Ranges

FICO (Fair Isaac Corporation) produces the most widely used credit scoring model. Approximately 90% of top lenders use FICO scores. There are multiple FICO models (FICO 8, FICO 9, FICO 10), but they share the same 300–850 range.

VantageScore is an alternative scoring model created jointly by the three credit bureaus (Equifax, Experian, TransUnion). Uses the same 300–850 range but weights factors differently. Often used for free credit score services — the score you see on Credit Karma is typically your VantageScore.

Industry-specific scores: Lenders in different industries use specialized FICO scores — FICO Auto Score 8 for car loans, FICO Bankcard Score for credit cards. These may differ slightly from your base FICO score.

Target score: Aim for 740+. At this level, you will qualify for the best rates on virtually all credit products. Scores above 800 offer minimal additional benefit in terms of loan terms.

The 5 Factors That Determine Your Score

FICO calculates your score using five factors, each weighted differently:

1. Payment History — 35% The single largest factor. Did you pay every bill on time? A single 30-day late payment can drop an excellent score by 60–100 points. Late payments stay on your report for 7 years.

2. Credit Utilization — 30% The ratio of your credit card balances to your total credit limits. Using $3,000 of a $10,000 limit = 30% utilization. Lower is better:

• Under 10% → excellent impact
• 10–30% → good impact
• 30–50% → moderate negative impact
• Over 50% → significant negative impact

Credit utilization is the fastest-changing factor in your score. Pay down balances before the statement closing date (when issuers report to bureaus) to instantly improve your score.

3. Length of Credit History — 15% How long you have had credit accounts. Includes age of your oldest account, newest account, and average age of all accounts. This is why closing old credit cards — even ones you do not use — often hurts your score.

4. Credit Mix — 10% Lenders like to see that you can manage different types of credit: revolving (credit cards, HELOCs) and installment (mortgages, auto loans, student loans). Having only credit cards slightly limits your score.

5. New Credit (Hard Inquiries) — 10% Applying for new credit triggers a "hard inquiry" — a lender pulling your full credit report. Each hard inquiry temporarily lowers your score by 5–10 points and stays on your report for 2 years. Multiple applications in a short window for the same product type (mortgage shopping) are typically treated as one inquiry.

How to Check Your Score for Free

You are entitled to a free credit report from each of the three major bureaus every year. You are not entitled to your FICO score for free — but many sources provide it:

Free credit score sources:

• AnnualCreditReport.com — official site for free credit reports from all three bureaus (now weekly access)
• Credit Karma — free VantageScore from Equifax and TransUnion; updates weekly
• Experian.com — free FICO Score 8 from Experian; updates monthly
• Your credit card issuer — most major issuers (Chase, Discover, Amex, Capital One) provide free FICO scores monthly
• Your bank — many banks provide free score access through online banking

Which score to trust: Your score will differ slightly across bureaus because not all lenders report to all three. When a lender pulls your credit for a major loan, ask which bureau they use — that bureau's score is what matters for that application.

Monitor for errors: Review your credit report from each bureau annually. Errors are more common than most people expect — a 2013 FTC study found that one in five Americans had an error on at least one credit report. Dispute errors directly with the bureau online; they must investigate within 30 days.

How to Build Credit from Scratch

If you have no credit history, you are invisible to lenders — which is nearly as problematic as having bad credit.

Step 1: Secured credit card A secured card requires a cash deposit (typically $200–$500) that becomes your credit limit. Use it for small regular purchases, pay the full balance monthly. After 6–12 months of on-time payments, you build a positive credit history and can upgrade to a regular card.

Step 2: Become an authorized user Ask a family member with excellent credit to add you as an authorized user on their card. Their entire payment history on that card often appears on your credit report — instantly aging your credit history.

Step 3: Credit-builder loan Offered by many credit unions and community banks. You make monthly payments into a savings account; the "loan" is released to you at the end. The payment history is reported to all three bureaus, building your credit without actual borrowing risk.

Step 4: Student credit cards Designed for people with limited history. Lower limits, easier approval requirements. Use responsibly and pay in full monthly.

Timeline: Most people can achieve a 700+ score within 12–18 months of establishing their first accounts, assuming no missed payments.

How to Improve a Low Score

If your score is in the 500s or 600s, these actions will have the biggest impact:

Immediate impact (1–3 months):

• Pay down credit card balances aggressively — especially anything above 30% utilization
• Dispute any errors on your credit reports
• Become an authorized user on a family member's excellent-standing card

Medium-term impact (3–12 months):

• Set up autopay for every account — eliminate the risk of missed payments
• Request credit limit increases on existing cards (improves utilization ratio without spending more)
• Keep all accounts open and in good standing

Long-term (1+ years):

• Make every payment on time, every month, without exception
• Avoid opening too many new accounts at once
• Let time work — the negative impact of past mistakes fades

How long negative items stay on your report:

What Hurts Your Score

Beyond missed payments and high utilization, these actions commonly damage credit scores:

• Closing old credit cards — reduces total available credit (increases utilization) and lowers average account age
• Applying for multiple new cards in a short period — multiple hard inquiries signal financial stress
• Maxing out credit cards — even if paid on time, high utilization significantly hurts your score
• Co-signing a loan — you are equally responsible; if the primary borrower misses payments, your score suffers
• Ignoring a collections account — unpaid collections tank your score and stay for 7 years
• Settling a debt for less than owed — reported as "settled" rather than "paid in full," which is a negative mark
• Opening a retail store card impulsively — hard inquiry plus a new account lowers average age

Credit Score vs Credit Report

These two things are related but distinct — and many people confuse them.

Credit Report: A detailed record of your entire credit history — every account you have ever opened, every payment made or missed, every inquiry, and any public records (bankruptcies, liens). Maintained separately by Equifax, Experian, and TransUnion. Available free at AnnualCreditReport.com.

Credit Score: A three-digit number calculated from the data in your credit report. It is a snapshot, not a history. Your score changes every time your credit report is updated.

Soft vs hard inquiries:

• Soft inquiry — checking your own score, pre-qualification checks, employer background checks. Does not affect your score.
• Hard inquiry — a lender pulling your full report for a credit decision. Temporarily lowers your score by 5–10 points.

Key Takeaways

• Your credit score is a 300–850 number representing creditworthiness; FICO scores are used by 90% of top lenders
• A 100-point score difference can cost $80,000+ over the life of a single mortgage
• The five FICO factors: payment history (35%), credit utilization (30%), length of history (15%), credit mix (10%), new credit (10%)
• Never miss a payment — it is the single most damaging thing you can do to your score
• Keep credit card utilization below 10–30% of your available limit
• Check your credit reports annually at AnnualCreditReport.com for errors; dispute any inaccuracies
• Building credit from scratch: start with a secured card, become an authorized user, or use a credit-builder loan
• Keep old credit card accounts open; closing them reduces your available credit and lowers account age