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Total interest = (Monthly Payment × n) − P.
Rate tiers are based on 2026 average rates by FICO band from Experian and Freddie Mac data.
How Much Does Your FICO Score Affect Your Loan Rate?
Your FICO credit score is one of the single most powerful factors determining your mortgage or auto loan interest rate. A difference of just 100 points can mean paying tens of thousands of dollars more in interest over the life of a loan. This calculator makes that cost visible so you can make an informed decision about whether to delay a major purchase to improve your score first.
Monthly payment at 7.0% = $1,996 | At 6.5% = $1,896
Difference = $100/month = $36,000 saved over 30 years
FICO Score Tiers and Typical Mortgage Rates (2026)
| FICO Score | Tier | Approx. 30-Yr Rate | Monthly (300K) |
|---|---|---|---|
| 760–850 | Exceptional | ~6.25% | ~$1,847 |
| 740–759 | Very Good | ~6.50% | ~$1,896 |
| 720–739 | Very Good | ~6.75% | ~$1,946 |
| 700–719 | Good | ~7.00% | ~$1,996 |
| 660–699 | Fair/Good | ~7.50% | ~$2,098 |
| 620–659 | Fair | ~8.25% | ~$2,254 |
| Below 620 | Poor | May not qualify | — |
Fastest Ways to Improve Your FICO Score
| Action | Score Impact | Timeframe |
|---|---|---|
| Pay down credit card balances below 30% utilization | +20 to +50 points | 1–2 months |
| Dispute and remove errors from credit report | +10 to +100 points | 30–45 days |
| Make all payments on time for 6+ months | +20 to +40 points | 6 months |
| Become an authorized user on old account | +10 to +30 points | 1–2 months |
| Avoid new credit applications before loan | Prevents −5 to −10 | Immediate |
Improving your FICO from 620 to 760 on a $300,000 30-year mortgage can save over $80,000 in total interest. The monthly payment difference is often $150–$300/month.
Most lenders offer best rates at 760 or above. Scores 700–759 get good rates. Below 620 typically cannot qualify for conventional loans.
A 50-point improvement typically reduces mortgage rates by 0.25%–0.5%. On $300,000 that saves $15,000–$30,000 over 30 years.
FICO scores range 300–850: Exceptional (800+), Very Good (740–799), Good (670–739), Fair (580–669), Poor (under 580). Conventional mortgages typically require 620 minimum.
Meaningful improvements in 3–6 months by paying down balances below 30%, paying on time, and avoiding new applications. 50–100 point gains may take 12–24 months.
No. Self-checks are soft inquiries and don't affect your score. Only hard inquiries from lenders when you apply for credit can temporarily lower it by a few points.
Payment history (35%), amounts owed/utilization (30%), length of credit history (15%), new credit (10%), credit mix (10%).
FICO is the most widely used model, used by 90% of top lenders. VantageScore also exists but FICO is the standard for mortgage and auto loan underwriting.
High utilization (above 30%) lowers FICO, which raises your rate. Paying down revolving balances before applying is the fastest way to boost your score.
Best auto rates go to scores above 720. Scores 660–719 get near-prime rates. Below 600 results in subprime rates of 10%+ from specialty lenders.