Car Refinance Calculator
Refinancing an auto loan can change your monthly payment, your repayment timeline, and the total amount you pay over the life of the loan. The Car Refinance Calculator estimates the monthly principal and interest payment on a new fixed-rate loan using your current payoff balance, any fees added to the loan, the new interest rate, and the new term.
For SUV owners comparing financing options, this estimate can make it easier to see how a proposed rate or repayment period affects the monthly budget. The result is an estimate, not a loan offer, and the calculator does not determine whether you qualify for refinancing.
What the Car Refinance Calculator does
The car refinance calculator estimates your Monthly Payment after replacing an existing car loan with a new one. It adds any refinancing fees you choose to finance to your current loan payoff balance, then calculates an equal monthly principal and interest payment over the new loan term.
The calculation assumes a fixed interest rate, monthly compounding, and payments made at the end of each month. It excludes fees paid upfront, taxes, insurance, and other costs that are not added to the new loan.
A lower estimated payment may give you more room in your monthly budget, but it does not automatically mean the refinance will cost less overall. A longer repayment term can reduce the monthly payment while increasing the total interest paid.
How to use the Car Refinance Calculator
Gather your current loan payoff information and the terms of a refinance offer or scenario you want to compare. Then enter the following values:
- Current loan payoff balance ($): Enter the amount needed to pay off your existing auto loan, in dollars. Ask your current lender for a payoff quote because the payoff amount can differ from the balance shown on a recent statement.
- Refinancing fees added to loan ($): Enter any refinancing fees that will be included in the new loan balance. Enter zero if no fees are being financed. Fees paid separately upfront do not belong in this field.
- New annual interest rate (%): Enter the proposed nominal annual interest rate as a percentage. For example, enter 6 for a 6% annual interest rate. Use the interest rate rather than the annual percentage rate when applying this formula.
- New loan term (months): Enter the number of monthly payments in the new loan. For example, five years is 60 months. The calculator accepts terms from 1 to 120 months.
The result is the estimated monthly principal and interest payment, displayed in dollars and cents. Try different rates or terms to compare scenarios, while keeping in mind that the terms available to you depend on the lender and your application.
How the Car Refinance Calculator formula works
The calculator first combines the current payoff balance and the refinancing fees added to the loan. This sum is the new loan principal.
When the annual interest rate is greater than zero, the calculator uses the standard fixed-payment loan formula:
Monthly payment = Principal × Monthly interest rate ÷ [1 − (1 + Monthly interest rate)−Number of months]
The monthly interest rate is the annual percentage rate entered as the interest rate divided by 1,200. For example, an assumed nominal annual interest rate of 6% gives a monthly rate of 0.005, or 0.5%. This sample rate is only an assumption for explaining the formula.
When the interest rate is 0%, there is no interest to calculate. The formula instead divides the new loan principal evenly by the number of months.
Worked example: the calculator defaults
Suppose an SUV owner enters the following illustrative values:
- Current loan payoff balance: $20,000
- Refinancing fees added to loan: $0
- New annual interest rate: 0%
- New loan term: 60 months
The new principal is $20,000 plus $0, or $20,000. Because the assumed rate is zero, dividing $20,000 by 60 gives an estimated monthly payment of $333.33, rounded to cents. The 0% default is illustrative; it is not a current rate or a recommendation.
As another zero-interest example, a $12,000 payoff balance with $600 in financed fees produces a new principal of $12,600. Dividing that amount over an assumed 36-month term gives a monthly payment of $350.00. Actual loan terms may differ.
Use cases for the Car Refinance Calculator
The calculator is useful when you want to explore a few possible loan structures before committing to an offer. Consider these common scenarios:
- Comparing repayment terms: Enter the same balance, financed fees, and rate with different terms to see how the estimated monthly payment changes.
- Evaluating financed fees: Compare a scenario with fees added to the loan against one with no financed fees. Remember to account separately for any fees paid upfront.
- Testing rate scenarios: See how different assumed annual interest rates affect the payment while holding the loan amount and term constant.
- Planning an SUV budget: Estimate the principal and interest portion of a potential payment, then add insurance, fuel, maintenance, and other ownership costs separately.
- Reviewing a lender quote: Enter the quoted payoff amount, financed fees, rate, and term to check whether the estimated payment is broadly consistent with the offer.
For a useful comparison, consider the remaining cost of your existing loan alongside the proposed refinance. This calculator does not automatically calculate your current loan’s remaining payments, total refinance interest, or savings.
Other factors to consider when calculating Monthly Payment
Payoff balance and timing: A payoff quote may be valid only through a certain date. Interest can continue to accrue before the existing loan is paid, so confirm the amount and timing with your lender.
Fees and upfront costs: Fees added to the new loan increase the principal and can also increase the interest paid over time. Fees paid upfront do not appear in the estimated monthly payment, but they still affect the overall cost of refinancing.
Interest rate versus APR: The interest rate is used in this calculator’s payment formula. APR generally reflects the interest rate and certain financing charges, making it useful when comparing the broader cost of offers. The calculator does not calculate APR.
Loan term and total cost: Extending the term generally lowers the monthly payment when other inputs stay the same, but it can increase total interest. To estimate the new loan’s scheduled principal and interest payments, multiply the displayed monthly payment by the number of months. Rounding can cause a small difference from the lender’s final payment schedule. Add upfront costs separately, and compare the result with the remaining cost of your current loan.
Existing loan conditions: Check whether your current loan has a prepayment charge or other payoff conditions. Also review the new lender’s terms for any requirements or charges that are not included in the calculator.
Qualification and lender calculations: Your actual rate, term, fees, and payment depend on the lender’s offer and underwriting. The lender may also use different payment dates, interest accrual methods, or rounding rules. Review the final loan documents before making a decision.
Car Refinance Calculator FAQ
Will refinancing always lower my car payment?
No. Your payment depends on the new principal, interest rate, and term. A higher rate, additional financed fees, or a shorter term could increase the payment. Enter the proposed terms to estimate the result.
Should I enter the current loan balance or the payoff amount?
Use the current loan payoff balance requested by the calculator. A lender-provided payoff quote is generally the better starting point because it reflects the amount needed to settle the loan by the quoted date.
Does the calculator include refinancing fees?
It includes fees entered as Refinancing fees added to loan by adding them to the principal. It does not include fees paid upfront or other costs that are not financed.
Can a lower monthly payment cost me more overall?
Yes. A longer term can lower the payment while leaving more time for interest to accrue. Compare the scheduled payments over the full new term, upfront costs, and the remaining cost of your existing loan.
Does the calculator show my savings from refinancing?
No. It estimates the new monthly principal and interest payment only. To assess potential savings, compare the total remaining cost of your current loan with the total cost of the proposed refinance, including applicable fees and other charges.