What FICO Score Means in Plain English
FICO stands for Fair Isaac Corporation, the company that created the model in 1989. Today, FICO scores are used by 90% of top lenders in their credit decisions — which means that when a bank, mortgage company, or auto lender is deciding whether to approve you and at what rate, they’re almost certainly looking at some version of your FICO score.
This distinction matters because the score you see on many free credit monitoring apps — Credit Karma, for example — is typically a VantageScore, not your FICO. That VantageScore may be 20, 30, or even 50 points different from your FICO. Neither is wrong; they’re just measuring similar things with different formulas. But when you’re preparing for a major credit application, you want to know your actual FICO score, not a proxy.
You can get your FICO score directly at myfico.com (there’s a fee), or many credit card issuers now show customers their FICO score for free in their app or online portal — Chase, Citibank, American Express, Discover, and others. That’s your starting point.
How FICO Score Works
FICO calculates your score from five weighted factors:
- Payment history — 35%. Have you paid every account on time, every month? A single missed payment can drop your score significantly.
- Amounts owed / credit utilization — 30%. How much of your available credit are you using? Lower is better, ideally under 10%.
- Length of credit history — 15%. How long have your accounts been open? Older is better, which is why you shouldn’t close old cards.
- Credit mix — 10%. Do you have a variety of account types — credit cards, installment loans, a mortgage? Diversity helps a little.
- New credit — 10%. Have you recently opened several new accounts or had many hard inquiries? This can signal risk.
There are also multiple versions of FICO, which is where things get complicated. FICO 8 is the most commonly used version for credit cards and general lending. FICO 9 treats paid collections differently (it ignores them) and medical debt differently (less penalty). FICO 10 and 10T are newer versions that some lenders have adopted. For mortgage lending, many lenders still use older versions: FICO 2 (Experian), FICO 4 (TransUnion), and FICO 5 (Equifax).
Why FICO Score Matters to You
The version of FICO your lender uses determines which rules apply to you. This isn’t something you can control, but you should know it. If you paid off a medical collection last year and your FICO 9 score looks great, but the mortgage lender uses FICO 5, that paid collection may still count against you on FICO 5. Knowing this prevents unpleasant surprises.
For most everyday credit decisions — credit cards, personal loans, auto loans — FICO 8 is the dominant version. Focus on the fundamentals that improve every FICO version: pay on time, keep utilization low, let your account age grow, and only apply for new credit when you need it. Those four principles move every FICO version in the right direction.
Quick Example
Kevin is applying for a mortgage. The broker pulls all three bureaus and uses FICO 2, FICO 4, and FICO 5 (the three mortgage-specific versions). His scores come back as 742 (Equifax FICO 5), 731 (TransUnion FICO 4), and 729 (Experian FICO 2). The lender uses the middle score of 731. Meanwhile, Kevin’s Credit Karma shows a VantageScore of 768, and the FICO 8 score on his Discover account shows 754. Both were accurate — just not the versions the mortgage lender used.
Common Misconceptions
- “The score I see on Credit Karma is my FICO score.” — Credit Karma and most other free monitoring apps show your VantageScore, not your FICO score. They’re related but not the same. For a major loan decision, find your actual FICO score through your card issuer or myfico.com.
- “There’s one FICO score.” — There are dozens of FICO versions, and your score varies by both the version and the bureau. FICO 8 from Equifax and FICO 8 from TransUnion can differ because the underlying data they’re using may differ. Lenders pull what they pull — you can’t change which version they use.