How Your Credit Score Is Calculated: All 5 Factors Explained

What Is a Credit Score?

Your credit score is a three-digit number (300–850) that summarizes your creditworthiness. Lenders use it to decide whether to give you a loan and at what interest rate.

2026 Score Ranges:

• 300–579: Poor (high-risk borrower)
• 580–669: Fair (risky)
• 670–739: Good (trustworthy)
• 740–799: Very Good (preferred)
• 800–850: Excellent (best rates)

Your score isn't passed down or universal. Equifax, Experian, and TransUnion (the three major bureaus) calculate slightly different scores using the same five factors.

What the difference is worth in dollars. A score band is not a status symbol; it is a price. Take a $350,000 30-year mortgage: at 6.50% the principal-and-interest payment is $2,212 a month, and at 6.75% it is $2,270 — $58 a month, $696 a year, and roughly $20,800 over the full term for one quarter of a percentage point. Lenders typically price in tiers, so crossing from 690 to 720 can move you more than one tier. That is the return on the work described below, and you can see what a rate difference costs across the life of a loan in the mortgage payoff calculator.

The Five Factors: What They Are and How They Work

Factor 1: Payment History (35% of Your Score)

What it measures: Did you pay bills on time?

Your payment history is the most important factor because lenders want assurance you'll pay them back. A single missed payment can drop your score 20–100 points depending on your prior record.

What counts:

• Credit card payments
• Mortgage payments
• Car loan payments
• Student loan payments
• Utility bills
• Medical bills (if sent to collections)

What doesn't count:

• Rent payments — most landlords do not furnish data to the bureaus, so rent is invisible unless your landlord reports it or you enroll in a rent-reporting service that does
• Insurance premiums
• Telephone bills
• Non-delinquent accounts

Timeline:

• 30 days late: Reported to bureau, score drops 15–40 points
• 60 days late: Score drops 40–80 points
• 90 days late: Score drops 80–150 points
• Collections/Charge-off: Score drops 80–200 points, stays on record 7 years

Recovery: Once you start paying on time again, the impact lessens after 12 months, but the late payment remains on your report for 7 years (with decreasing impact).

Example:

June 2026: Credit score 750
July 2026: Miss credit card payment by 30 days
July 2026 report date: Credit score drops to 710 (-40 points)
August 2026: Make payment plus late fees
August 2026 onwards: Payment history improves, score recovers 3–5 points/month
By January 2027: Score back to 740 (minus some ongoing impact)
By June 2033: Late payment fully ages off

Factor 2: Credit Utilization (30% of Your Score)

What it measures: How much credit are you using relative to your limits?

Your credit utilization ratio is your total debt divided by your total credit limits.

Formula:

Total debt ÷ Total credit limits = Credit utilization %

Example:

• Credit card 1 limit: $5,000, balance: $1,500
• Credit card 2 limit: $10,000, balance: $2,000
• Total debt: $3,500
• Total limits: $15,000
• Utilization: $3,500 ÷ $15,000 = 23.3%

Optimal levels:

• Below 10%: Excellent
• 10–30%: Good
• 30–50%: Fair (starting to impact score)
• 50–100%: Poor (significant score hit)

Why it matters: High utilization signals financial stress ("I'm using all available credit, might not pay me back"). Low utilization signals control ("They're not desperate for credit"). This is also why an emergency fund is a credit-score tool as much as a savings tool — the households that spike to 80% utilization are usually the ones absorbing a car repair or a medical bill on plastic because there is no cash behind it. Three to six months of essential expenses is the standard target, and the emergency fund calculator sizes it against your actual fixed costs rather than a round number.

Important: Utilization is a snapshot, not a monthly average. Your issuer reports the balance shown on your statement closing date, not the balance after you pay. If you charge $5,000 on a $10,000 limit and pay in full on the due date, the bureaus may still have recorded 50% utilization — because the statement closed before your payment. Paying the balance down before the statement closing date is what produces a low reported number.

Impact on score:

• At 10% utilization: Score unaffected
• At 30% utilization: Score drops 20–30 points
• At 50% utilization: Score drops 50–100 points
• At 100% utilization: Score drops 100–200 points

The key: You don't need to pay off your card completely to keep utilization low. Just keep balances below 30% of your limit. If you have a $5,000 limit, keep the balance under $1,500.

If the balances are large enough that 30% is out of reach this month, sequence the paydown deliberately rather than spreading cash evenly. For utilization purposes, the fastest score gain comes from clearing the individual card closest to its limit, because FICO looks at per-card utilization as well as the aggregate; for interest purposes, the fastest payoff comes from attacking the highest rate first. Those two goals often point at different cards, and the debt payoff planner shows what each ordering costs in months and in interest so you can pick knowingly.

Factor 3: Length of Credit History (15% of Your Score)

What it measures: How long have you been using credit responsibly?

This includes:

• Age of your oldest account
• Age of your newest account
• Average age of all accounts

Timeline impact:

• Less than 1 year: Limits your score to ~600 (insufficient history)
• 1–3 years: Score capped around 650–700
• 3–7 years: Significant boost, score can reach 740+
• 7+ years: No additional benefit, but longer history is always helpful

How it works: Credit bureaus want to see sustained, responsible behavior over time. Someone who's been paying bills for 10 years carries more weight than someone with 1 year of perfect history.

The paradox: Closing old accounts hurts your score because it shortens average account age. Keep your oldest credit card open even if you don't use it.

Example:

Account 1 (opened 2016, age 10 years)
Account 2 (opened 2020, age 6 years)
Account 3 (opened 2024, age 2 years)
Average age: (10 + 6 + 2) ÷ 3 = 6 years

Close Account 1:
Account 2 (age 6 years)
Account 3 (age 2 years)
Average age: (6 + 2) ÷ 2 = 4 years
Score drops 10–20 points due to shortened history

Factor 4: Credit Mix (10% of Your Score)

What it measures: Do you responsibly use different types of credit?

Credit bureaus reward people who manage multiple types of credit:

Types of credit:

• Revolving (credit cards, lines of credit): You can borrow, pay back, borrow again
• Installment (car loans, mortgages, student loans): You borrow a lump sum, pay back in fixed installments

Ideal mix:

• 2–3 credit cards (revolving)
• 1 car loan or mortgage (installment)
• 0–1 personal loan (installment)

Impact: Having only credit cards (all revolving) is lower score (~20–30 point hit). Having credit cards plus a car loan or mortgage is better (~50–100 point boost vs. no credit history).

Important: Don't open new accounts just for mix. The impact of new inquiries and average age decrease outweigh the benefit of new account types.

Factor 5: New Inquiries (10% of Your Score)

What it measures: How many lenders have recently checked your credit?

Two types of inquiries:

Hard inquiry (hurts score):

• When you apply for credit (mortgage, car loan, credit card)
• Appears on your report
• Drops score 5–10 points per inquiry
• Recovers within 3–6 months
• Multiple hard inquiries of the same type (auto, mortgage, student loan) inside a 45-day window count as one on current FICO versions. Older FICO models used a 14-day window, so 14 days is the conservative floor — but you do not have to compress a mortgage search into two weeks.

Soft inquiry (doesn't hurt):

• When a lender pre-screens you ("You're pre-approved for...")
• When you check your own credit
• When an existing creditor reviews your account
• Doesn't appear on inquiries

Timeline:

• Inquiries stay on your report 2 years
• Impact on score decreases after 6 months
• After 12 months, minimal impact

Example:

June 15: Apply for credit card (hard inquiry) → Score drops 8 points
June 20: Apply for auto loan (hard inquiry) → Counted separately; card and auto are different types and are never merged
June 20–July 5: Apply to three more auto lenders → All auto inquiries in the 45-day window still count as one
July 15: 30-day recovery → Score recovers 3 points
August 15: 60-day recovery → Score back to baseline
June 2027: Inquiries no longer counted in your FICO score (only the last 12 months count)
June 2028: Inquiries fall off the report entirely (2 years)

How to Use These Factors to Improve Your Score

Priority Order for Score Improvement

Month 1: Payment History

• Set up autopay for all accounts (minimum payments)
• Ensure no 30+ day late payments
• Impact: +10–50 points (if you had recent late payments)

Month 2–3: Utilization

• Pay down credit card balances to under 30% of the limit — and pay before the statement closing date, not the due date
• If the balance is $4,500 on a $10,000 limit, get it under $3,000; clear the single most maxed-out card first
• Impact: +20–50 points (if utilization was high)

Month 4+: Patience

• Let time do its work (age of history and recovered late payments)
• Impact: +5–10 points/month as negative items age

Why Your Score Dropped (And How to Fix It)

Recent drops (5–20 points):

• Hard inquiry from new credit application → Wait 6 months
• New account opened → Wait 3–6 months for it to establish
• Missed payment → Set up autopay, pay on time for 6+ months

Moderate drops (20–50 points):

• Credit utilization increased → Pay down to <30% of limit
• Multiple hard inquiries → Space out credit applications (max 1–2/year)
• Closed old account → Minimize further closures, wait 2+ years

Major drops (50+ points):

• 30+ day late payment → 12 months of on-time payments to recover
• Collections account or charge-off → Negotiate payment, wait 7 years for removal
• Bankruptcy → 7–10 years to recover fully

FICO vs. VantageScore in 2026

Two major credit scoring models exist:

For practical purposes, focus on FICO. 80% of lenders use it. Your VantageScore and FICO might differ by 30–50 points, but improving one improves both.

Common Credit Score Myths (Debunked)

Myth: Checking your own credit hurts your score. False. Checking your own credit is a soft inquiry and has zero impact.

Myth: Paying off debt immediately improves your score. Partially false. Paying off revolving debt (credit card) helps. Paying off installment loans (car, student) actually slightly lowers score because you lose the positive payment history contribution.

Myth: You need to carry a balance to build credit. False. You build credit by having accounts and paying them on time. Carrying a balance costs interest; paying in full costs $0 and builds the same credit.

Myth: Bad credit is permanent. False. Even a 30-day late payment recovers in 6–12 months. Collections can be disputed or negotiated. Bankruptcy recovers in 5–10 years.

Myth: Multiple credit cards hurt your score. False. Multiple cards improve score if you keep utilization low on each. $10,000 across 4 cards ($2,500 each) looks better than $10,000 on 1 card.

Your Credit Score Action Plan for 2026

• Check your credit report at annualcreditreport.com — free every week from each of the three bureaus, not once a year
• Note any errors or late payments
• Set up autopay for all accounts
• Calculate your utilization; pay down if >30%
• Note accounts' ages; don't close old accounts
• Limit new credit applications to 1–2/year
• Re-check credit in 6 months; expect +20–50 point improvement

FAQ

How long does it realistically take to go from 620 to 720?

Between six months and two years, depending on what is holding the score down, because the five factors move at completely different speeds. Utilization is the fast one: pay balances down before the statement closes and the new figure reports within one billing cycle, typically 30–45 days, and can be worth 20–50 points on its own. A 30-day late payment stops dragging heavily after about 12 months of clean history but stays on the report for 7 years. A collection or charge-off also sits for 7 years, and a Chapter 7 bankruptcy for 10. If your problem is thin history rather than damage, time is the only fix — the average age of accounts cannot be accelerated.

Does an old medical bill in collections still hurt my score?

Much less than it used to, and often not at all. Since 2022–2023 the three bureaus have removed paid medical collections entirely and stopped reporting unpaid medical collections under $500, and they wait a year after the debt goes to collections before it appears at all — which gives insurance and billing disputes time to resolve. Balances of $500 or more can still be reported and still hurt. Newer scoring models (FICO 9 and 10, VantageScore 4.0) also weigh medical collections less heavily than other collections, but many mortgage lenders still pull older FICO versions that do not make that distinction.

Will closing a credit card I never use hurt my score?

Usually yes, and the damage arrives sooner than most people expect. The immediate hit is utilization, not age: closing a card with a $10,000 limit removes that $10,000 from the denominator, so a $3,000 balance across your remaining cards can jump from 15% to 30% overnight. The age effect is slower — closed accounts in good standing stay on your report for up to 10 years and keep counting toward length of history until they fall off. If the problem is an annual fee, ask the issuer for a product change to a no-fee card on the same account number; that keeps the account, the limit, and the open date.

I have no credit history at all. What's the fastest way to get a score?

You need at least one account open for six months that has reported to the bureau within the last six months before FICO will generate a score at all — so the clock starts when the account is opened, and there is no way to shorten it. The three practical starting points are a secured card (you deposit $200–$500, which becomes the limit), being added as an authorized user on a family member's long-standing card (their history for that account can appear on your report), or a credit-builder loan from a credit union, where the "loan" sits in a locked savings account while you make payments. Use one, keep utilization under 10%, and expect a usable score in roughly six to twelve months.

Sources

• myFICO (Fair Isaac Corporation). How are FICO Scores Calculated? https://www.myfico.com/credit-education/whats-in-your-credit-score
• myFICO (Fair Isaac Corporation). How to Rate Shop and Minimize the Impact to Your FICO Scores. https://www.myfico.com/credit-education/blog/rate-shop
• Consumer Financial Protection Bureau. What is a credit score? https://www.consumerfinance.gov/ask-cfpb/what-is-a-credit-score-en-315/
• Federal Trade Commission. Free Credit Reports. https://consumer.ftc.gov/articles/free-credit-reports