What Is a Credit Score? How It Works and How to Improve It

Your credit score is a three-digit number — typically between 300 and 850 — that tells lenders how risky it is to loan you money. It is calculated by credit bureaus based on your borrowing history, and it determines whether you get approved for a mortgage, a car loan, or a credit card, and at what interest rate.

A difference of 100 points on your credit score can mean paying tens of thousands of dollars more in interest over the life of a mortgage. Understanding how your score is calculated is the first step to improving it.

FICO vs. VantageScore

There are two main credit scoring models used in the US. FICO (Fair Isaac Corporation) is the older and more widely used model — about 90% of top lenders use FICO scores. VantageScore was developed jointly by the three major credit bureaus (Equifax, Experian, and TransUnion) and is commonly used by free credit score services.

Both use a 300–850 range and weigh similar factors, but they weight them differently. A score from one model may differ slightly from the other. When applying for a mortgage or auto loan, the lender will almost certainly use a FICO score.

Credit Score Ranges

Score Range	Rating	What it means
800–850	Exceptional	Best rates; instant approval on most products
740–799	Very Good	Near-best rates; easy approvals
670–739	Good	Average US score; standard rates
580–669	Fair	Higher rates; limited product choices
300–579	Poor	May be denied; needs secured products

The average US FICO score as of 2024 is approximately 717 — in the "Good" range. About 23% of Americans have a score above 800 (Exceptional).

How Your Credit Score Is Calculated

FICO calculates your score from five factors, weighted differently:

Factor	Weight	What it measures
Payment history	35%	Whether you pay on time — single most important factor
Amounts owed	30%	Credit utilization ratio (balance ÷ limit)
Length of history	15%	Age of oldest account, newest account, and average
Credit mix	10%	Mix of revolving (cards) and installment (loans)
New credit	10%	Recent applications and hard inquiries

Credit Utilization: The Biggest Lever You Can Pull

Credit utilization is your total credit card balance divided by your total credit limit. If you owe $2,000 across cards with a combined $10,000 limit, your utilization is 20%.

Utilization accounts for 30% of your FICO score and is one of the fastest factors to change. The general rule is to keep utilization below 30%, and ideally below 10% for an excellent score. A common misconception is that you need to carry a balance to build credit — you do not. Paying your balance in full each month gives you the utilization benefit without paying interest.

What Hurts Your Credit Score the Most

• Missed payments — Even one 30-day late payment can drop a score by 60–110 points
• Maxed-out cards — High utilization signals financial stress
• Accounts sent to collections — Stays on report for 7 years
• Bankruptcy — Chapter 7 stays for 10 years, Chapter 13 for 7
• Foreclosure — Stays for 7 years, can drop score 100+ points
• Multiple hard inquiries in a short period — Each reduces score by ~5 points

How to Improve Your Credit Score

The strategies that move your score fastest:

1. Set up autopay for at least the minimum payment — Never miss a payment. Payment history is 35% of your score and a single missed payment causes severe damage.
2. Pay down high-balance cards first — Target cards where your balance is closest to the limit. Lowering utilization below 30% can add 20–50+ points.
3. Request a credit limit increase — If your income has risen, ask your card issuer for a higher limit. A higher limit with the same balance = lower utilization = higher score.
4. Don't close old accounts — Closing an old card reduces your total available credit (raising utilization) and shortens your credit history. Both hurt your score.
5. Dispute errors on your credit report — Get your free annual report at AnnualCreditReport.com. Errors are more common than you'd think. Disputing incorrect negative items can remove them.
6. Become an authorized user — Being added to someone else's established, low-utilization account can add years of positive history to your file instantly.

How Long Does It Take to Improve a Credit Score?

Action	Time to impact	Expected gain
Pay down card below 30% utilization	1 billing cycle (30 days)	20–50 points
Dispute and remove error	30–60 days	Varies widely
Become authorized user	1–2 months	10–30 points
Add a new credit line	6–12 months	10–20 points (long term)
Recover from a missed payment	12–24 months	60–100 points
Recover from bankruptcy	3–7 years	Full recovery possible

Soft Inquiries vs. Hard Inquiries

Not all credit checks hurt your score. A soft inquiry happens when you check your own credit, when a lender pre-approves you without your application, or when an employer checks your report. Soft inquiries do not affect your score.

A hard inquiry happens when you formally apply for credit — a credit card, mortgage, car loan, or personal loan. Each hard inquiry typically reduces your score by about 5 points and stays on your report for 2 years, though the scoring impact diminishes after 12 months.