The Five Factors Inside Every FICO Score

What FICO Scores Are Made Of

Your FICO score — the three-digit number most lenders pull when you apply for a loan, credit card, or mortgage — isn't a mystery formula. It's calculated from five specific categories of information drawn from your credit report. Each category carries a different percentage weight, and understanding that breakdown tells you exactly where to direct your energy.

For a deeper look at the underlying data that feeds these calculations, see our full breakdown of your credit report.

The Five Factors, One by One

Here's how FICO weights each factor for most scoring models, along with what it actually measures:

1. Payment History — 35%

The single largest factor. It tracks whether you've paid your accounts on time. Late payments, collections, and bankruptcies all dent this category. Even one 30-day late payment can have a meaningful impact. Consistent, on-time payments are the most straightforward way to protect your score.

2. Amounts Owed (Credit Utilization) — 30%

This measures how much of your available revolving credit you're using at any given time — most commonly expressed as a percentage. Carrying a balance near your credit limit signals financial strain to lenders. As a general guideline, staying below 30% utilization across all cards is widely cited, though lower is generally better. Utilization is recalculated each scoring cycle, so paying down balances can produce relatively quick results.

3. Length of Credit History — 15%

Older accounts work in your favor here. FICO considers the age of your oldest account, your newest account, and the average age of all accounts. This is why closing an old credit card — even one you rarely use — can sometimes lower your score by reducing your average account age.

4. Credit Mix — 10%

Lenders like to see that you can manage different types of credit responsibly. A mix of revolving accounts (credit cards) and installment loans (auto loans, student loans, mortgages) signals broader financial experience. You don't need to take on debt just to diversify — this factor carries relatively modest weight.

5. New Credit (Hard Inquiries) — 10%

Each time you apply for new credit and a lender pulls your report, a hard inquiry is recorded. Multiple inquiries in a short window can suggest financial stress to scoring models. However, FICO typically treats multiple inquiries for the same loan type (like mortgage shopping) within a short period as a single inquiry — so rate-shopping doesn't penalize you the way multiple credit card applications would.

See how these factors play out differently across life stages in our article on how credit scores evolve over time.

Using This Knowledge Practically

Because payment history and credit utilization together account for 65% of your score, those two levers deserve the most attention for most people. If your score needs improvement, prioritize these in order:

1. Bring all accounts current and stay current — even one missed payment causes outsized damage.
2. Pay down revolving balances to reduce your utilization ratio.
3. Avoid opening several new accounts in a short window unless necessary.
4. Think carefully before closing old accounts, particularly your oldest card.

Credit building is incremental. Negative items fade in influence over time, and consistent positive behavior compounds. Avoid the patterns covered in our guide on habits that quietly damage credit scores — some of the most common mistakes aren't obvious until they've already done harm.

If you're preparing to apply for a mortgage, note that lenders may weigh your full credit profile differently than your score alone suggests. Our overview of credit score assumptions that trip up home buyers covers what many applicants get wrong.

This article is for general informational purposes only and does not constitute personalized financial or credit advice. Consult a qualified financial professional for guidance specific to your situation.