A credit score estimates how likely you are to repay credit on time, using information in your credit reports. Most scores use a 300–850 scale. But the number becomes more useful when you identify the model, check the underlying information, and understand which part of your credit profile needs attention. [1]
This guide explains the ranges, corrects a common misunderstanding about FICO percentages, and walks through a two-card utilization example. For a short introduction, start with what a credit score measures. For the wider topic, explore our Credit & Debt Hub.
Before comparing scores, check these three details
You can have different scores because the scoring model, credit-report data, and calculation date differ. An app’s score may therefore differ from the score used for a loan application. [1]
- Model: Are you looking at a FICO Score or a VantageScore? Free credit-monitoring apps often display a VantageScore, while lenders typically pull a FICO Score. They use different formulas, so the numbers rarely match exactly.
- Report: Which credit bureau supplied the information?
- Date: When was the score calculated?
Write these beside the number when tracking progress. Comparing the same model and bureau over time makes the comparison easier to interpret.
What is a good credit score?
For base FICO Scores on the 300–850 scale, myFICO describes these ranges. Other models can use different labels. [2]
| Score | FICO rating |
|---|---|
| 300–579 | Poor |
| 580–669 | Fair |
| 670–739 | Good |
| 740–799 | Very good |
| 800–850 | Exceptional |
These labels help interpret a score; they are not universal approval thresholds. Lenders set their own requirements and consider other information. A score of 740 does not automatically secure the lowest available rate. [2]
How FICO factors work: percentages are not point allowances
FICO publishes five broad categories and their typical importance for the general population: [3]
| Category | Typical importance |
|---|---|
| Payment history | 35% |
| Amounts owed | 30% |
| Length of credit history | 15% |
| New credit | 10% |
| Credit mix | 10% |
The 30% category is amounts owed, not utilization alone. Utilization is one part of it. The percentages do not divide 850 into fixed point buckets. FICO says category importance can vary by credit profile, and a single change’s precise effect cannot be determined without considering the full report. [3]
Use the categories to organize a review. For example, check payment records through our payment history guide and review applications with our explanation of hard and soft inquiries.
The Rich Guy Math example: 10% overall can hide a 90% card
The following is an original hypothetical calculation using two ordinary credit cards with reported limits. It illustrates the difference between overall utilization and individual-card utilization. FICO considers both overall utilization and high utilization on particular revolving accounts. [4]
| Account | Reported balance | Reported limit | Utilization |
|---|---|---|---|
| Card A | $900 | $1,000 | 90% |
| Card B | $100 | $9,000 | About 1.11% |
| Combined | $1,000 | $10,000 | 10% |
Individual utilization = reported card balance ÷ reported card limit × 100.
Overall utilization = total included reported balances ÷ total included reported limits × 100.
Here, overall utilization is $1,000 ÷ $10,000 × 100 = 10%. Taking a simple average of the two card percentages would give about 45.56%, which is incorrect for overall utilization: the cards have different limits.
Now suppose a $300 payment reduces Card A’s reported balance to $600, with all other inputs unchanged. Card A becomes 60% utilized. Overall utilization becomes $700 ÷ $10,000 × 100 = 7%.
The calculations show exactly how the ratios change. They do not tell us how many score points the payment earns, or which debt should take priority when interest rates and payment obligations differ. For more examples, read our credit utilization guide.
Use reported figures. FICO uses balances and limits in the credit report, which may differ from the current amounts shown in your banking app. Special account types can receive different treatment, so do not add every borrowing limit to this simple credit-card worksheet. [4]
A practical framework: identify, diagnose, act, verify
This is our editorial checklist for organizing a credit review, not a scoring model.
- Identify: Record the score, model, bureau, and date.
- Diagnose: Examine the report and any explanatory factors provided with the score. Separate incorrect data from accurate information you want to improve.
- Act: Choose an action connected to the issue you found.
- Verify: Check whether the underlying report information changes, then compare an updated score on a consistent basis.
| What you notice | What to check next |
|---|---|
| An unfamiliar account or incorrect balance | Identify the affected report and gather records. Follow our guide to disputing credit report errors. |
| A payment due soon | Check the amount and deadline. Set a reminder or review your automatic-payment settings and available funds. |
| Low overall utilization but one heavily used card | Calculate each card’s ratio as well as the combined ratio. |
| Two services display different scores | Compare their model, bureau, and calculation date before concluding that either number is wrong. |
| You are preparing to borrow | Review the underlying reports and ask the lender which score and other criteria apply to that product. |
If you are unsure where to find account details, use our walkthrough of how to read a credit report.
For an actual reporting error, the CFPB recommends contacting both the credit reporting company and the company that supplied the information. Explain the issue and provide supporting documents; keep copies. [5]
Common questions
Should I pay interest to build credit?
No. You do not need to carry a balance or pay interest to build a FICO Score. A balance reported before you pay your bill is different from debt carried beyond its due date. [6]
Is utilization below 30% always good enough?
Thirty percent is not a universal boundary between good and bad credit. Check individual cards and overall utilization, alongside the rest of your report. [4]
Can a calculator predict my score after a payment?
A utilization worksheet can calculate balances and ratios. Those inputs alone cannot establish an exact FICO point change. [3]
Your next step
Choose one task: identify the score you are tracking, check a questionable report entry, or calculate your reported card utilization. Record the starting information and the action you take. A clear record gives you something concrete to verify when updated information appears.
Sources and calculation notes
- CFPB: What is a credit score?
- myFICO: Credit scores and ranges
- myFICO: What’s in your FICO Scores?
- myFICO: Accounts that affect credit utilization
- CFPB: How to dispute a credit report error
- myFICO: You don’t need to carry a balance
Sources checked September 29, 2026. The two-card example is hypothetical and calculated by The Rich Guy Math. It assumes unchanged limits, no additional transactions, and the specified balances appearing in the report. Percentages are rounded where indicated.
Last Reviewed: September 29, 2026.
About the author: Max Fonji writes The Rich Guy Math’s educational guides. Learn more about the author.
This guide provides general education about U.S. credit scores. Individual scoring results and lending decisions vary.