Quick Definition
A FICO score is a three-digit number between 300 and 850 that represents how likely you are to repay a debt. It's calculated by Fair Isaac Corporation (the company behind the FICO name) using data from your credit report. Think of it as a grade for your borrowing behavior — the higher the number, the less risky you look to lenders.
Over 90% of top lenders use FICO scores when making credit decisions. If you've applied for a mortgage, auto loan, or credit card recently, someone pulled a FICO score on you.
How It Works
FICO scores aren't one thing — there are dozens of versions. FICO 8 is the most widely used for general lending. FICO 9 handles medical debt differently. Auto lenders often use FICO Auto Scores, mortgage lenders use older versions (FICO 2, 4, or 5). The range is always 300–850, but the formula varies slightly by version and industry.
All FICO scores are built from five factors, each weighted differently:
| Factor | Weight | What It Measures |
|---|---|---|
| Payment History | 35% | Whether you pay on time. One late payment can drop your score 50–100 points. |
| Amounts Owed | 30% | Your credit utilization — how much of your available credit you're using. |
| Length of Credit History | 15% | Age of your oldest account, newest account, and average age of all accounts. |
| Credit Mix | 10% | Having both revolving (cards) and installment (loans) credit helps. |
| New Credit | 10% | Recent hard inquiries and newly opened accounts. |
The score ranges break down roughly like this: 800–850 is exceptional, 740–799 is very good, 670–739 is good, 580–669 is fair, and below 580 is poor. The difference between "fair" and "very good" can be the difference between a 7% interest rate and a 3% rate on a car loan — that's thousands of dollars over the life of the loan.
Why It Matters for Credit Repair
Since payment history (35%) and amounts owed (30%) make up 65% of your score, those are the highest-use targets for credit repair. Removing a false late payment or incorrect charge-off directly attacks the biggest factor. Paying down balances — or disputing inflated balances — hits the second biggest factor.
Negative items like collections, charge-offs, and late payments age off your report after 7 years (bankruptcies after 10). But you don't have to wait — if any of that information is inaccurate, reported in violation of Metro 2 standards, or unverifiable, you have the right to dispute it under the FCRA right now.
Even if a negative item is accurate and can't be removed, the damage it does to your score decreases over time. A 3-year-old late payment hurts far less than one from 3 months ago.
What Most People Get Wrong
- Myth: Checking your own credit hurts your score. It doesn't. Checking your own credit is a soft inquiry, which has zero impact. Only hard inquiries (from lenders when you apply for credit) affect your score.
- Myth: Closing old cards improves your score. Usually the opposite is true. Closing an account reduces your available credit (raising utilization) and can lower your average account age.
- Myth: Carrying a balance builds credit. You don't need to pay interest to build a good payment history. Paying in full every month is better — it keeps utilization low and avoids interest charges.
- Myth: Your FICO score is a single number. You actually have many FICO scores. Each bureau generates one using their data, and different loan types use different FICO versions. That's why scores can vary when you check different sources.
Jess's Take
the FICO score feels like this mysterious black box but honestly 65% of it comes down to two things — pay on time and keep your balances low. fix those two things and the score follows. everything else is optimization.