Student Loan Refinance Calculator

What this calculator does

This student loan refinance calculator compares what you are paying now with what a new private loan would cost. Enter your balance, your current rate, your income, the repayment period, and any extra payment, and it returns the monthly payment, the total interest, and the saving that a different rate or term produces.

Refinancing student debt is arithmetically simple — there are usually no fees, so it is rate against rate. What makes it a genuinely difficult decision is that refinancing federal loans converts them into private debt permanently. The dollars saved are easy to compute; the protections surrendered are not, and they are the part that matters most.

When to use it

Run it when your circumstances have improved since the loans were originated: a materially higher income, a credit score that has moved up a tier or two, or a market where rates have fallen below what you locked in. Graduate PLUS loans, which carry the highest federal rates plus an origination fee, are the most frequent candidates.

It is equally valuable for the decision not to refinance. If you work for a qualifying non-profit and are 40 payments into Public Service Loan Forgiveness, the calculator will show a lower payment from refinancing — and taking it would forfeit a much larger sum. Run the forgiveness scenario alongside the refinance one and compare totals, not monthly payments.

Understanding the inputs

Loan balance is the total you would refinance, which need not be all your loans. Interest rate should be the weighted average of the loans you plan to include, weighting each rate by its balance rather than taking a simple average.

Annual income affects both approval and pricing; refinance lenders typically want debt-to-income under 45 to 50 percent. Repayment period is where the real choice sits: refinancing to a lower rate over a longer term can increase total interest even while the monthly payment falls. Run the same term you have now to see the true rate benefit, then adjust. The extra payment field shows what overpaying adds on top.

How is this calculated?

Compare monthly payments and total interest under current vs refinanced terms.

A worked example

Take a $65,000 balance at 7.2 percent with ten years remaining. The payment is about $761 a month and total interest roughly $26,371. Refinancing to 5.4 percent over the same ten years drops the payment to about $702 and total interest to roughly $19,265 — a saving of around $7,106.

Shorten the refinanced term to seven years and the payment rises to about $931, but total interest falls to roughly $13,202, saving around $13,169 against the original loan. If those were federal loans and you work in public service, however, PSLF could have forgiven far more than $13,169 — which is why the term comparison is the easy part.

Limitations and assumptions

This calculator compares loan mathematics and nothing else. It cannot value the federal protections you would surrender: income-driven repayment, forbearance during unemployment, discharge on death or total disability, and eligibility for any future federal relief program. Those are worth a great deal in a bad year and nothing in a good one.

It also assumes no fees, a fixed rate, and on-time payments throughout, and it cannot tell you what rate you will actually be offered. Prequalify with several lenders using soft pulls, run the real numbers here, and if forgiveness is even plausible in your situation, take advice before signing anything irreversible.