Student Loan Refinance Calculator: Compare Savings

Student loan refinancing can reduce a monthly payment, lower total interest, shorten repayment, or produce some combination of those outcomes. Lower rates alone do not guarantee the best result because changing the term can materially alter both payment size and lifetime cost.

How to Use the Student Loan Refinance Calculator

Enter the remaining balance, fixed interest rate and years left on the current loan, then add the rate and term from a refinance offer. Both sides are modeled as equal-payment fixed-rate loans.

• Current balance: Principal that would be paid off by the refinance loan.
• Current interest rate: Fixed rate used to estimate the remaining current-loan schedule.
• Years remaining: Whole years left if the existing fixed-payment schedule continues.
• New interest rate: Fixed rate offered or being tested for the refinance.
• New loan term: Whole-number repayment period for the refinance loan.

Separate comparisons are preferable when multiple existing loans have different rates or remaining terms. Combining balances can work when a properly weighted rate and compatible repayment timeline are available, but a simple average can distort the comparison.

Origination fees are not a standard input because major student-loan refinance offers commonly advertise no origination, application or prepayment fees. Any actual lender charge should still be added to the offer review before making a final decision.

How Refinance Savings Are Calculated

Standard amortization is applied separately to the current schedule and the refinance schedule. Each monthly payment is calculated from principal, fixed rate and term.

Refinance principal is assumed to equal the current remaining balance. Total interest equals all scheduled payments minus that principal, and estimated interest savings equal current remaining interest minus refinance interest.

Using the default $35,000 balance with 10 years remaining, the current 6.5% schedule produces an estimated payment of $397.42. Refinancing the same balance to 5% for 10 years lowers the payment to about $371.23, a reduction of approximately $26.19 per month.

Total remaining interest under the current schedule is about $12,690.15. Refinancing at that rate produces roughly $9,547.52 of interest, for estimated savings of about $3,142.63 when no lender fees are added.

Lower Monthly Payment Does Not Always Mean Lower Cost

Extending the refinance term can lower the monthly payment even when lifetime interest rises. Comparing only the new payment can therefore make an expensive refinance look attractive.

Shortening the term creates the opposite trade-off. Higher required payments retire principal faster, leaving less balance outstanding for future interest charges.

Interest savings or extra interest cost therefore becomes the second result card. Calculation details also show the monthly-payment change and payoff-time change so the rate and term effects remain visible together.

Strong refinance offers improve the metric that matters without creating an unwanted trade-off elsewhere. Borrowers focused on cash flow may tolerate a longer term, while borrowers focused on total cost may prefer a higher payment and faster payoff.

Federal Loans Require an Extra Decision Before Refinancing

Federal student loans cannot be refinanced inside the federal student aid system. Moving them into a refinance loan means using a private lender and taking the refinanced debt out of the federal program.

Borrower benefits attached to federal loans do not transfer to the new private loan. Income-driven repayment options, federal deferment and forbearance rights, and eligibility for certain forgiveness or discharge programs can be lost permanently after refinancing.

Lower private rates must therefore be weighed against benefits that may be difficult to value in advance. Borrowers pursuing Public Service Loan Forgiveness, relying on income-based payments, or needing federal hardship options can give up much more than an interest-rate difference.

Private loans do not create the same issue because they already sit outside the federal system. Refinancing private debt can still introduce variable-rate risk, different cosigner terms, or lender-specific hardship policies that deserve review.

What the Comparison Does Not Include

Variable-rate refinance offers are outside the model because future rate changes cannot be known in advance. Compare a variable-rate quote using the lender’s disclosures and consider how payment could change if the rate rises.

Current loans on income-driven or otherwise changing payment schedules also need a different approach. Entering a fixed term and rate assumes level monthly payments rather than a payment tied to income, family size or program rules.

Fees, accrued unpaid interest, capitalization, extra payments and lender incentives can alter the final economics. Prequalification results should be treated as an offer scenario until the lender provides final rate and term disclosures.

Credit approval matters independently of the calculator. Modeled refinance savings exist only if the borrower actually qualifies for the entered rate and term.