How Is Your Credit Score Calculated? The 5 Factors Explained

How is your credit score calculated? FICO and VantageScore both build it from five weighted factors pulled straight from your credit report: payment history, amounts owed, length of credit history, credit mix, and new credit. No single missed payment or new card “resets” it. The formula just reweighs what's already in your file. Brand new to credit with no file yet? Our guide on what credit score you start with covers that specific question. This guide covers how the calculation works once you already have a score.

How Is Your Credit Score Calculated? The 5 Factors

Five factors determine how is your credit score calculated. Each one carries a different weight. According to myFICO, the official consumer site run by the company that builds the FICO Score, those weights are payment history (35%), amounts owed (30%), length of credit history (15%), credit mix (10%), and new credit (10%). VantageScore is the other major credit scoring system. It considers a similar set of factors, but weighs them differently and updates its model more often. Your FICO Score and your VantageScore can land in different spots even when both read the same credit report. That's ultimately how credit scores are calculated across every model: five factors, one report, weighted differently.

Factor	Weight in FICO Score	What it measures
Payment history	35%	Whether you've paid past credit accounts on time
Amounts owed	30%	How much of your available credit you're currently using
Length of credit history	15%	The age of your oldest and average account
Credit mix	10%	Whether you have a mix of cards, auto loans, student loans, or a mortgage
New credit	10%	How many accounts and hard inquiries you've added recently

Those percentages are averages across the general population, not a fixed formula that treats everyone the same. Someone with a thin file, just one or two accounts, reacts differently than someone with 15 years of history and a paid-off mortgage. New credit and length of history swing a thin file's score more. This explains why two people can make the same move, like paying off a card, and see different point changes based on what's already in their file. Credit scores from the same person can even differ by bureau, since not every lender reports to all three.

It also helps to know that “your credit score” isn't one single number. Lenders sometimes pull industry-specific FICO Scores built for auto lending or credit cards. These weigh the same five factors a little differently for that use case. General-purpose scores, the kind consumers usually see, sit alongside those industry versions. Different scoring models, and different versions within FICO itself, can land a few points apart even when they're reading the exact same report. Opening multiple new accounts at once, or building several account types too quickly, can nudge more than one of these models in the wrong direction at the same time.

Payment History (35%): The Biggest Single Factor

Payment history carries more weight than any other factor. It's the clearest signal of risk a lender has. Most issuers don't report a payment as late until it's 30 days past due. Once they do, it can stay on your report and keep affecting your score for years. Collections, charge-offs, and public records like judgments or foreclosures all fall under this same factor and can have a lasting impact. Nothing damages the calculation faster than a payment reported 30, 60, or 90+ days late. Building it back up takes a long, boring streak of on-time payments across every account, and that habit has the single biggest impact on your finances long term.

Amounts Owed (30%): Your Credit Utilization Ratio

Amounts owed looks mainly at your credit utilization ratio, the percentage of your available revolving credit you're actually using. Add up the limits on all your credit cards. Add up your total balances. Divide balances by limits. Three cards with limits of $5,000, $7,000, and $1,500 add up to a $13,500 total limit. Balances of $500, $200, and $0 add up to $700. That's a utilization ratio of about 5%.

Most experts and card issuers recommend keeping utilization under 30%. The closer to 0% you get without hurting other factors, the higher your score tends to run, and paying your bills in full each month is the simplest way to improve this factor fast. This ratio is calculated across all your revolving accounts combined, not per card. Closing one card with a balance still open on another can push your overall ratio up even if you didn't spend a dollar more. Carrying a small balance on purpose to “help” your score is a myth. Paying in full every month for a 0% utilization ratio is the best position for this factor.

Length of Credit History (15%)

This factor looks at the age of your oldest account and the average age across all your accounts, including ones you've closed within the last several years. Having a longer history helps, but it isn't required for a good credit score. Plenty of people reach “good” or “very good” territory in a few years of responsible use. Closing your oldest card can eventually shorten your average age of credit. If it doesn't carry an annual fee, there's usually little reason to close it.

Credit Mix and New Credit (10% Each)

Credit mix considers whether you've responsibly handled different types of accounts. Revolving accounts like credit cards sit in one column, installment accounts like an auto loan, a student loan, or a mortgage sit in another. Lenders like seeing that you can manage more than one type of debt. This is a smaller factor, though, and not a reason to take out a loan you don't need.

New credit looks at how many accounts you've opened recently and how many hard inquiries show up on your report. Applying for several cards or loans in a short window signals more risk, especially with a short credit history. If a mortgage or auto loan application is coming up in the next several months, it's smart to hold off on opening anything else.

Where the Numbers Come From: Your Credit Report

Every input to the calculation comes from your credit report. The three major credit bureaus, Equifax, Experian, and TransUnion, each maintain their own version. Each one can hold slightly different information depending on which lenders report to it. That's one reason your FICO Score can vary a few points from bureau to bureau. You're entitled to a free copy of your report from all three. As of a permanent rule the FTC announced in 2023, you can pull a free report from each bureau every week, for life, at AnnualCreditReport.com, the only site mandated by federal law for free reports. Any other site charging you money for this is selling something you already own for free.

Checking your own credit report or score is called a soft inquiry, and it never affects your score. Only a hard inquiry, generated when you apply for new credit, counts as a factor. Errors on your report can drag your score down for reasons that have nothing to do with your actual behavior. It's worth a look at all three reports at least once a year, even when nothing seems wrong.

Negative Information: How Long It Affects the Calculation

Negative information doesn't stay on your report forever. Once it drops off, it stops affecting the calculation entirely. According to the Consumer Financial Protection Bureau, most negative items, including late payments, collections, judgments, and foreclosures, can be reported for up to 7 years. Chapter 13 bankruptcy also falls off after 7 years, while a Chapter 7 bankruptcy can stay for up to 10 years from the filing date. None of that is permanent. Building a stack of positive, on-time payment history in the meantime does far more for your score than waiting out the clock.

What a Good Credit Score Looks Like Once It's Calculated

FICO Scores run from 300 to 850. The five bands most lenders use, per myFICO's own score education pages, are Poor (300–579), Fair (580–669), Good (670–739), Very Good (740–799), and Exceptional (800–850). You don't need an 850 to get the best available rates on a mortgage or auto loan. Most lenders treat everything in the Very Good and Exceptional bands about the same. A good credit score in the high 700s already unlocks nearly every rate a lender offers. Chasing the last 40 or 50 points usually isn't worth the tradeoffs. Closing a card to “clean up” your file, for example, can cost you elsewhere in the calculation and shrink your available credit at the same time.

Conclusion: Focus on the Factors You Can Control

The calculation behind your credit score isn't a black box. It's five factors, weighted in a fairly consistent order, built entirely from what's already sitting in your credit report. Pay your bills on time. Keep your utilization low. Leave old accounts open. Don't open several new accounts at once, and let time do the rest for your credit history. Small, consistent moves improve every one of these factors over time. Better numbers here mean lower rates on every loan and credit card you apply for later, which is real money back in your budget.

Starting from zero? See our guide on what credit score you start with. Our step-by-step guide to building credit from scratch and our breakdown of how to lower your credit utilization ratio are the next two places to go. Once your score is in good shape, our guide on how to choose a credit card can help you put it to work.