How Credit Scores Are Calculated — and What You Can Do About It
Understand the 5 factors behind your score, FICO vs. VantageScore, and where to see what lenders actually see.
What Is a Credit Score?
A credit score is a three-digit number — typically between 300 and 850 — that represents your creditworthiness to lenders. The higher your score, the less risk you pose, and the better terms you'll receive on loans, credit cards, apartments, and sometimes even jobs.
Your score is not arbitrary. It's calculated from real data in your credit report using a mathematical formula. Understanding the formula is how you learn to move the number.
The 5 Factors That Build Your Score
FICO — the dominant scoring model — calculates your score from five categories, each weighted differently:
The single most important factor. Whether you paid on time across all accounts. A single 30-day late payment can drop your score 50–100 points. Late payments stay on your report for 7 years but fade in impact over time.
How much of your available credit you're using. Applies both overall and per-card. People with 800+ scores typically carry 1–7% utilization. This is the fastest factor to change — it resets every billing cycle.
How long you've had credit — including the age of your oldest account, newest account, and average age of all accounts. This is why closing old cards hurts your score.
Having both revolving credit (cards) and installment loans (mortgages, auto, personal loans) in your history. Don't take on debt just to diversify — but having a mix does help.
Hard inquiries from credit applications drop your score 2–5 points each and stay for 2 years (impact only 12 months). Checking your own credit is a soft inquiry — zero impact.
FICO vs. VantageScore — What's the Difference?
When people talk about their credit score, they usually mean one of two models. Understanding the difference can save you from surprises at the lender's office.
| Factor | FICO | VantageScore |
|---|---|---|
| Score range | 300–850 | 300–850 |
| Lender adoption | 90%+ of top lenders | Growing, but secondary |
| Min. history needed | 6 months, 1 account | 1 month, 1 account |
| Where you see it | myFICO.com, many banks | Credit Karma, CreditWise |
| Medical debt | Less impact in FICO 9+ | Less impact in VS 4.0 |
Where to Check Your Real FICO Score (Free)
| Tool | Bureau | Score Type | Cost |
|---|---|---|---|
| Experian (free account) | Experian | FICO Score 8 | Free |
| Discover Credit Scorecard | Experian | FICO Score 8 | Free (no card needed) |
| Many bank apps | Varies | FICO Score 8 | Free (existing customer) |
| myFICO.com | All 3 bureaus | Multiple FICO versions | Paid |
| Credit Karma | TransUnion + Equifax | VantageScore 3.0 | Free |