| Score range | Rating | APR | Monthly payment | Total interest | Total paid | Loan amount |
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| Payment # | Beginning balance | Payment amount | Interest paid | Principal paid | Ending balance |
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What is a credit score?
A credit score is a three-digit number that estimates how likely you are to repay borrowed money on time. Most credit scores in the United States range from 300 to 850. Lenders use this score to decide whether to lend you money and what interest rate to charge.
The most common score is the FICO score. Lenders generally treat scores above 780 as "excellent," scores in the high 600s and 700s as "good," and scores below 600 as "poor."
What affects your score
Your payment history is the largest factor. Paying every bill on time, every time, is the single most important habit. A few late payments can drop your score for years.
Your credit utilization is the second largest factor. This is the share of your available credit you are actually using. Carrying a balance close to your credit limit lowers your score, even if you pay it off each month. A good rule of thumb is to keep utilization below 30%, and below 10% is even better.
Length of credit history, credit mix (different types of credit accounts), and new credit inquiries also factor in, but they matter less than payment history and utilization.
How a score becomes an interest rate
Lenders use your score to decide how risky you are. A higher score signals that you are likely to pay back what you borrow, so lenders offer you a lower interest rate. A lower score signals more risk, so lenders charge a higher rate to make up for the chance of loss.
Even small score differences can change your rate. A 50-point drop can move you from one tier to the next, often raising your rate by one or more percentage points.
Why a few percentage points matter so much
A small difference in interest rate becomes a huge difference in total cost over the life of a loan. On a $30,000 car loan over 5 years, going from a 5% to a 10% rate adds thousands of dollars in interest. On a 30-year mortgage, the difference between rates can be tens or hundreds of thousands of dollars.
Interest compounds against you
When you carry a balance, interest is charged on the balance. If you do not pay it off, that interest gets added to the balance and starts earning more interest itself. On high-rate credit cards, this can cause a balance to grow quickly even without new purchases.
How to improve your score
The fastest way to improve a credit score is to pay every bill on time and pay down credit card balances. Avoid applying for many new accounts at once. Keep old accounts open if there is no fee, since the length of your credit history helps your score.
You can check your credit report for free once a year from each major bureau. Reviewing it lets you spot errors that may be hurting your score.
Common misconceptions
Checking your own credit score does not lower it. Closing old credit cards can actually lower your score by reducing your average account age and your total available credit. Carrying a balance from month to month does not "build" your credit — paying on time does, and you can do that while paying the balance in full.
Key takeaway
A credit score is one of the most quietly powerful numbers in your financial life. A higher score saves money on every loan you take out, sometimes by tens of thousands of dollars. Building good credit is mostly about boring, steady habits: pay on time, keep balances low, and let your accounts age.