A 50-basis-point gap in your mortgage rate — the kind that separates a strong credit score from a mediocre one — costs about $133 more a month on a $400,000 loan. Hand-checked, that's roughly $47,880 gone over 30 years, for no reason other than three digits on a credit report.
The scale itself
US credit scores run 300 to 850 on the FICO scale (VantageScore mirrors the range with slightly different math underneath). Below 580 is poor. 580 to 669 is fair. 670 to 739 is good. 740 to 799 is very good. 800 and above is exceptional. Most lenders will approve you somewhere north of 670 — but "approved" and "getting the best rate available" are two very different outcomes, and the gap between them is where real money lives.
What's actually behind the number
Payment history carries the most weight, about 35% of your FICO score — a single payment 30+ days late does real damage. Credit utilization is close behind at roughly 30%, meaning how much of your available credit you're actually using at any given moment. Keep that under 30%, ideally under 10%, on revolving accounts, and you'll move the needle faster than almost anything else you could do. The rest — how long you've had credit, the mix of account types, recent hard inquiries — fills out the remaining third.
Three things people get wrong
Checking your own score doesn't hurt it. That's a soft inquiry, invisible to your credit report, and completely free to do as often as you like. Closing an old card, on the other hand, can actually hurt you — it shrinks your total available credit (pushing your utilization ratio up) and quietly ages down your average account history. And carrying a small balance instead of paying in full each month does nothing for your score despite the persistent rumor; it just costs you interest for no benefit at all.
Why the 680-to-760 gap is worth chasing
That $47,880 example isn't an outlier — it's what a half-point rate gap does on a typical loan. Pricing on conventional mortgages moves in steps, and the two steps that matter most are 740 and 760; there's not much left to gain once you clear the second one. Run your own numbers through the Mortgage Calculator to see what even a fraction of a percentage point costs over your actual loan term.
Checking your score costs nothing
US consumers get free weekly reports from all three bureaus — Equifax, Experian, TransUnion — through AnnualCreditReport.com, the only site the federal government actually authorizes for this. Most banks and card issuers throw in free score monitoring too, usually buried a tab or two into the app you already have.
A few things people actually ask
Does checking my own credit score lower it?
No. Checking your own score is a soft inquiry, invisible to your credit report and free to do as often as you like — it only shows up when a lender pulls a hard inquiry as part of an application.
Should I close old credit cards I don't use?
Generally no. Closing a card shrinks your total available credit, which pushes your utilization ratio up, and it quietly ages down your average account history — both work against your score.
Does carrying a small balance help my credit score?
No, that's a persistent myth. Paying your balance in full each month is better for both your score and your wallet — carrying a balance just costs you interest with no scoring benefit.