What Is a Credit Score and How Is It Calculated?

A credit score is a three digit number, typically running from 300 to 850, that sums up how likely you are to repay borrowed money. Lenders lean on it to decide whether to approve you for a card or loan and what interest rate to charge you, so understanding how it works can save you real money over time.

What Actually Goes Into the Number

Your score isn't pulled out of thin air. It comes from your credit history: the accounts you hold, how much you owe, and whether you've paid on time. The most widely used scoring model was built by the Fair Isaac Corporation, now simply called FICO, and it remains the standard that roughly 90 percent of lenders check before saying yes or no to an application.

Three companies actually track and report this history: Equifax, Experian, and TransUnion. Each one can end up with slightly different numbers because they don't always collect identical data, and FICO calculates a separate score for each bureau rather than one universal figure. That's why you might see three different scores depending on which bureau a lender pulls from.

How the Score Gets Built, Piece by Piece

Five ingredients make up a FICO score, and they carry very different weights:

Payment history and how much of your credit line you're using make up almost two thirds of the calculation, which explains why paying on time and keeping balances low matter more than almost anything else you can do.

Where You Land on the Scale

Every lender sets its own rules for what counts as acceptable, but the general categories used across the industry look like this:

A score of 700 or higher tends to open doors, often unlocking lower interest rates and easier approvals. Cross into the 800s and lenders view you as about as low risk as it gets. Landlords, cable companies, and even some employers check this number too, sometimes using it to set deposit amounts or, in the case of employers, as part of a hiring decision.

FICO Versus VantageScore

FICO isn't the only model out there. Equifax, Experian, and TransUnion jointly built VantageScore as an alternative. The difference is structural: FICO produces three separate bureau specific scores, while VantageScore combines data from all three bureaus into one consistent number that each bureau reports the same way. FICO still dominates lending decisions, but VantageScore has carved out a real presence, particularly for consumers checking their own credit for free through banking apps.

Practical Ways to Move the Number Higher

Improving a credit score is less about tricks and more about consistency. A few approaches actually move the needle:

• Pay on time, every time. It generally takes about six months of consistent, on time payments before you notice a real shift.
• Ask for a higher credit limit on cards in good standing. This can lower your utilization ratio, but only if you resist spending the extra room.
• Leave old, unused credit cards open. Closing an account, especially an older one, can shrink your available credit and shorten your average account age, both of which can ding your score.
• Check your credit report for errors. You're entitled to a free report every year from each bureau through AnnualCreditReport.com, and correcting mistakes can sometimes produce a quick bump.
• Consider a credit repair company if you're short on time. These firms negotiate with creditors and bureaus on your behalf for a monthly fee, though the trade off is cost versus convenience.

Kathryn Hauer, a certified financial planner in Aiken, South Carolina, points out that closing unused cards can indeed hurt your score, so instead of shutting accounts down entirely, she recommends keeping them active but dormant: verify there's no balance, confirm your contact details are current, turn off autopay, and set a reminder to check for fraud every six months or so.

Getting a Quick Boost

If you need movement fast, services like Experian Boost let you add alternative payment data, things like rent and utility bills, that don't normally show up in a traditional credit file. If you've got a clean track record paying those bills, folding them into your credit profile can push your score upward without waiting months for new account history to build.

So What Should You Actually Do With This Information?

Knowing your score is only useful if you act on it. Pull your free reports, check for errors, and treat on time payments and low utilization as the two levers that matter most. The rest, credit mix, account age, new applications, matters too, just less urgently. The open question for most people isn't what their score is today, but whether they're willing to build the habits that move it in the right direction over the next six to twelve months.