Auto Loan Interest Comparison Calculator
Instantly compare monthly payments and total interest costs between two different auto loan offers or refinance options to find the best deal.
Compare Your Loan Offers
Enter your desired loan amount, term, and the two interest rates you are considering. The calculator instantly reveals the true cost difference over the life of the loan.
Auto Loan Estimator
Compare monthly payments and total interest for two loan scenarios.
Understanding Auto Loans
Key factors that influence your borrowing costs
The Power of 1%
Even a seemingly small 1% difference in your APR can result in significant savings over a 5- or 7-year loan term, especially on larger loan amounts.
Total Cost vs Monthly Payment
Lenders often focus on the monthly payment. Extending the term lowers the monthly payment but drastically increases the total interest you will pay.
Refinancing Benefits
If your credit score has improved since you bought your car, or if market rates have dropped, refinancing can lower your rate and reduce your total interest.
Prepayment Penalties
Before refinancing or making extra payments, check your current loan agreement for prepayment penalties, which could offset your potential savings.
Short-Term vs Long-Term Auto Loans
Generalised comparisons to help you understand the broader financial implications of different loan durations.
| Feature | Short-Term Loan (e.g., 36 months) | Long-Term Loan (e.g., 72 months) | Advantage |
|---|---|---|---|
| Monthly Payment | Higher | Lower | Depends on Budget |
| Total Interest Paid | Significantly Lower | Significantly Higher | Short-Term |
| Equity Build-up | Faster (less risk of being “upside down”) | Slower (higher risk of negative equity) | Short-Term |
| Typical Interest Rate | Often lower (less risk for the lender) | Often higher | Short-Term |
Auto Loan Calculator FAQ
Answers to the most frequently asked questions about auto loan interest and financing.
The calculator takes your desired loan amount and term, then applies the two different annual interest rates you provide. It calculates the monthly payment and total interest paid for both options, showing you the exact difference in overall cost.
Financially, a lower total interest is always better. However, a lower monthly payment might be necessary for your current monthly budget. Be aware that extending the loan term to get a lower monthly payment usually results in paying significantly more interest over the life of the loan.
The best time to refinance is when your credit score has improved since you originally financed, or when market interest rates have dropped. Ensure that the new rate is at least 1-2% lower and that there are no hefty prepayment penalties on your current loan.
No. This calculator focuses strictly on the principal and interest components of the loan. Taxes, title, registration, and optional add-ons (like extended warranties or GAP insurance) should be added to your total loan amount before using the calculator.
A “good” rate depends on your credit score, the vehicle’s age (new vs. used), and current market conditions. Generally, borrowers with excellent credit can secure rates in the mid-single digits, while those with lower credit scores may face rates in the double digits.