Auto Loan Refinance Estimator Guide: Formula & Worked Example
Short answer
Monthly and total savings from refinancing your car loan. In the fixed example below, monthly savings is 32.57. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Auto Loan Refinance Estimator calculation using remaining balance, current rate, months left, new rate, new term, refinance fees
The inputs are remaining balance, current rate, months left, new rate, new term, refinance fees. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Remaining balance
- 20000
- Current rate
- 9
- Months left
- 48
- New rate
- 5.5
- New term
- 48
- Refinance fees
- 200
- Monthly savings: 32.57
- Current payment: 497.70
- New payment: 465.13
- Total savings after fees: 1,363.42
Understanding the result
Monthly and total savings from refinancing your car loan. Start with the base example, then replace each value with the figure that matches your situation.
Remaining balance
The example uses 20000 for remaining balance. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Current rate
The example uses 9 % for current rate. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Months left
The example uses 48 for months left. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
New rate
The example uses 5.5 % for new rate. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
New term
The example uses 48 months for new term. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Refinance fees
The example uses 200 for refinance fees. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The comparison changes only remaining balance, keeping every other example input fixed. This isolates that input's effect on the primary result. It does not predict future outcomes.
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Lower input | Remaining balance: 16000 | Monthly savings: 26.06 |
| Base example | Remaining balance: 20000 | Monthly savings: 32.57 |
| Higher input | Remaining balance: 24000 | Monthly savings: 39.09 |
Common mistakes
- Using the wrong units for remaining balance.
- Comparing results while changing more than one input at a time.
- Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Checklist
- Confirm remaining balance.
- Confirm current rate is expressed in %.
- Confirm months left.
- Confirm new rate is expressed in %.
- Confirm new term is expressed in months.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.