How to Read and Understand Your Credit Score
Your credit score is a three-digit number that determines the interest rates you pay on loans, whether you get approved for a mortgage, and sometimes whether you get hired or rent an apartment. Despite its importance, most people have only a vague idea of how it works.
This guide breaks down the five factors that determine your FICO score, explains the score ranges, and gives you a concrete action plan to improve your score over the next 3–6 months.
✨Key takeaways
- FICO scores range from 300–850. 670+ is "good," 740+ is "very good," 800+ is "exceptional."
- Five factors: payment history (35%), amounts owed (30%), length of history (15%), credit mix (10%), new credit (10%).
- Utilisation (% of credit used) is the fastest lever you can pull — aim to keep it below 30%, ideally under 10%.
- Checking your own score is a "soft inquiry" and does NOT affect your score.
Score ranges explained
300–579: Poor. Difficulty getting approved for most credit products. 580–669: Fair. Subprime rates; some approvals with conditions. 670–739: Good. Most lenders approve at competitive rates. 740–799: Very good. Better-than-average rates. 800–850: Exceptional. Best rates available.
The difference between a 680 and a 760 score on a $300,000 mortgage can be 0.5–1.0% in interest rate, translating to $30,000–$60,000 over the life of the loan. Score improvement has a direct financial payoff.
The five factors
Payment history (35%): the biggest factor. Even one 30-day late payment can drop your score 50–100 points. Set up autopay for at least the minimum on every account.
Amounts owed / Utilisation (30%): how much of your available credit you are using. A $3,000 balance on a $10,000 limit = 30% utilisation. Below 10% is ideal.
Length of credit history (15%): average age of all accounts. Keep old cards open (even if unused) to preserve history.
Credit mix (10%): having a mix of revolving (credit cards) and instalment (loans) accounts helps modestly.
New credit (10%): each hard inquiry (applying for credit) dips your score 5–10 points temporarily. Limit applications.
How to improve in 3–6 months
Month 1: Pay down credit card balances to below 30% utilisation. If you can, below 10%. This is the single fastest improvement method.
Month 1–2: Dispute any errors on your credit report at annualcreditreport.com. Errors are surprisingly common and can hurt your score.
Month 2–3: Set up autopay for every account to eliminate late payments. Even one missed payment stays on your report for 7 years.
Month 3–6: If your credit history is thin, consider a secured credit card or become an authorised user on a family member's old, well-managed card.
Common myths debunked
Myth: Checking your own score hurts it. Fact: Checking your own score is a soft inquiry and has zero impact.
Myth: Closing old cards improves your score. Fact: It usually hurts by reducing available credit (raising utilisation) and shortening average account age.
Myth: You need to carry a balance to build credit. Fact: You build credit by using the card and paying it off in full. Carrying a balance just costs you interest.
Myth: Income affects your credit score. Fact: Income is not a factor in FICO scoring. A high earner with bad habits can have a lower score than a low earner with perfect payments.
Try the calculators referenced in this guide
Put the maths into practice — every calculator is free and runs entirely in your browser.
Frequently Asked Questions
How often does my credit score update?
Most lenders report to the bureaus monthly. Your score can change every 30–45 days based on new data. Significant changes (paying off a large balance) can show up within one billing cycle.
What is the difference between FICO and VantageScore?
Both are credit scoring models. FICO is used by ~90% of lenders for lending decisions. VantageScore is used by many free credit monitoring apps. The ranges are similar (300–850) but the algorithms differ slightly.
How does a mortgage relate to my credit score?
Your score determines your mortgage rate. Use the Mortgage Calculator to see how a 0.5% rate difference (driven by credit score) affects your monthly payment and total interest.
The Precision Calculator Editorial Team
The editorial team at Get Precision Calculator writes practical, formula-driven guides that explain the maths behind every calculator on this site. All content is reviewed for accuracy before publishing.
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