How Is a Credit Score Calculated? | MoneyLens

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Originally published at https://money.thicket.sh/blog/how-is-a-credit-score-calculated.

By Jamie Reeves · July 15, 2026

A FICO credit score is calculated from five weighted factors: payment history (35%), amounts owed or credit utilization (30%), length of credit history (15%), new credit (10%), and credit mix (10%). Those percentages turn the account data lenders report to the credit bureaus into a single number from 300 to 850. Understanding the weights tells you exactly where to focus. The rest of this guide breaks down each factor, the score tiers, and the fastest ways to move the number up.

Your score is not stored in one place — it is calculated on demand from the information in your credit reports at the three national bureaus (Equifax, Experian, and TransUnion). When a lender requests a score, a scoring model reads that report and produces the number. FICO is the model most lenders use.

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The Five Factors and Their Weights

FICO publishes the relative weight of each category. They are approximate — the exact impact depends on your full file — but they are the map:

FactorWeightWhat It MeasuresPayment history35%Whether you pay on time; how late, how often, how recentlyAmounts owed (utilization)30%How much of your available credit you are usingLength of credit history15%Age of your oldest and average accountsNew credit10%Recent applications and hard inquiriesCredit mix10%Variety of account types (cards, loans, mortgage)
Source: FICO, What’s in my FICO Scores, and the Consumer Financial Protection Bureau, What is a credit score?

1. Payment History (35%)

The largest factor by far. Lenders report each month whether you paid on time, and the model weighs how recent, how frequent, and how severe any missed payments were. A single payment reported 30 days late can cut a strong score by 60–100 points, and the mark can stay on your report for up to seven years. Nothing else moves a score as much as consistently paying on time.

2. Amounts Owed / Credit Utilization (30%)

This is mostly about credit utilization — the percentage of your revolving credit limits you are using. If you have $10,000 in total card limits and a $3,000 balance, your utilization is 30%.

The widely cited guideline is to keep utilization below 30%, and below 10% is better still. Because utilization is recalculated each billing cycle, paying a card down before the statement closes is one of the fastest ways to raise a score. High balances are also a warning sign to lenders, which is a reason to have a plan for paying them off — compare the two proven methods in our debt snowball vs avalanche breakdown.

3. Length of Credit History (15%)

The model looks at the age of your oldest account, the average age of all accounts, and how long specific accounts have been open. A longer track record signals stability, which is why closing your oldest card — or opening several new ones at once — can quietly hurt your score by lowering the average age.

4. New Credit (10%)

Applying for credit generates a hard inquiry, which can shave a few points off and signals risk if you open many accounts in a short window. Hard inquiries fade within about a year and drop off entirely after two. This is separate from a soft inquiry — checking your own score, or a pre-approval offer — which never affects your score.

5. Credit Mix (10%)

Lenders like to see that you can handle different types of credit — revolving accounts like credit cards and installment loans like an auto loan or mortgage. It is the smallest factor, so it is never worth taking on debt you do not need just to diversify.

The Score Range and What the Tiers Mean

Both FICO and VantageScore run on a 300 to 850 scale. Lenders group scores into tiers that decide the rates you are offered:

TierFICO RangeWhat It MeansPoor300–579Approval difficult; deposits often requiredFair580–669Subprime rates; approval possibleGood670–739Near-average; most loans approvedVery Good740–799Better-than-average ratesExceptional800–850Best available rates
Source: Experian, What Is a Good Credit Score? Tier cutoffs vary slightly by lender and scoring model.

Why Your Score Matters: The Cost of a Few Points

A higher score is not just a number — it changes what you pay to borrow. On a mortgage, the gap between a “good” and an “excellent” score can mean a meaningfully lower rate and tens of thousands of dollars over the life of the loan. See how rate tiers flow into a monthly payment in How Much House Can I Afford? and model the exact numbers with the mortgage calculator.

Lenders also weigh your income against your obligations through your debt-to-income ratio, which is based on take-home pay — our sister site explains that starting point in Gross Pay vs Net Pay.

The Fastest Ways to Raise a Score

Never miss a payment. Autopay the minimum so a slip never lands on the biggest factor.
Pay cards down before the statement closes to report low utilization.
Keep old accounts open to preserve the average age of your history.
Space out applications so hard inquiries do not cluster.
Dispute errors. You are entitled to a free report from each bureau at AnnualCreditReport.com — inaccuracies drag scores down and are worth correcting. This article is educational and not financial advice. Scoring models and tier cutoffs vary by provider and change over time — confirm the details with the CFPB or the scoring company before making decisions based on your number.

Frequently Asked Questions

A FICO score is built from five weighted categories: payment history (35%), amounts owed or credit utilization (30%), length of credit history (15%), new credit and inquiries (10%), and credit mix (10%). Lenders report your account activity to the three national credit bureaus, and the scoring model turns that data into a number from 300 to 850.Payment history is the single largest factor at 35% of a FICO score. Whether you pay on time — and how recently, how often, and how severely you have missed payments — matters more than anything else. A single 30-day late payment can drop a strong score by 60 to 100 points.On the common 300–850 FICO scale, scores are generally grouped as poor (below 580), fair (580–669), good (670–739), very good (740–799), and exceptional (800–850). Most lenders reserve their best rates for scores of 740 and above.Credit utilization — the share of your available revolving credit you are using — is the biggest piece of the 'amounts owed' category. Keeping utilization below 30% is the widely cited guideline, and below 10% is better still. Utilization is calculated both per-card and across all cards, and it resets each billing cycle, so it is one of the fastest levers for raising a score.No. Checking your own score is a soft inquiry and never affects your credit. Only hard inquiries — when a lender pulls your report to make a lending decision — can lower your score, typically by a few points, and their effect fades within a year.FICO and VantageScore are two different scoring models built by different companies. Both use a 300–850 range, but they weight the underlying factors differently and may pull from different bureau data, so the same person can have scores that differ by several points to a few dozen. Most lenders use a FICO score.