Student Loan Refinance Estimator Guide: Formula & Worked Example
Short answer
Savings from refinancing federal or private student loans. In the fixed example below, lifetime savings is 4,561.41. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Student Loan Refinance Estimator calculation using loan balance, current rate, years left, new rate, new term
The inputs are loan balance, current rate, years left, new rate, new term. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Loan balance
- 40000
- Current rate
- 6.8
- Years left
- 10
- New rate
- 4.9
- New term
- 10
- Lifetime savings: 4,561.41
- Current payment: 460.32
- New payment: 422.31
- Note: Refinancing federal loans loses federal protections
Understanding the result
Savings from refinancing federal or private student loans. Start with the base example, then replace each value with the figure that matches your situation.
Loan balance
The example uses 40000 for loan balance. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Current rate
The example uses 6.8 % for current rate. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Years left
The example uses 10 for years left. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
New rate
The example uses 4.9 % 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 10 years for new term. 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 loan 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 Reference tax and exchange-rate data may be outdated; verify the official source before deciding.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 | Loan balance: 32000 | Lifetime savings: 3,649.13 |
| Base example | Loan balance: 40000 | Lifetime savings: 4,561.41 |
| Higher input | Loan balance: 48000 | Lifetime savings: 5,473.69 |
Common mistakes
- Using the wrong units for loan 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 loan balance.
- Confirm current rate is expressed in %.
- Confirm years left.
- Confirm new rate is expressed in %.
- Confirm new term is expressed in years.
- 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.