Student Loan Refinance Calculator United States

Refinancing replaces a student loan with a new one from a private lender, ideally at a lower rate. This student loan refinance calculator shows the new monthly payment, how it compares with what you pay now, and how much you would save in interest and total cost over the life of the loan.

How the calculation works

Enter your current balance, the rate you pay now and the months left on your current schedule, then the rate you have been quoted for the refinanced loan and its term in months. Both loans are treated as standard fixed-rate, fully amortizing loans with the same payment every month until the balance reaches zero, calculated with the standard amortization formula. At a zero rate the payment is simply the balance divided by the number of months.

Reading the results

The monthly saving is your current payment minus the new one. A positive number frees up room in your budget; a negative one means the new payment is higher, which can still make sense if you chose a shorter term to clear the debt faster. The new monthly payment is what you would owe each month after refinancing. The total interest and cost saved compares the total repaid on each loan over its full term, which shows the lifetime value of the offer.

Rate versus term

A refinance can lower the payment through a lower rate or a longer term. A lower rate reduces both the payment and the total you repay. A longer term eases cash flow but keeps you in debt longer and can raise total interest even when the rate falls. A payment that drops by a hundred dollars a month matters less if the term grew and the total repaid barely changed, which is why both savings figures appear side by side.

The federal loan trade-off

If your loans are federal, refinancing them into a private loan permanently gives up their federal protections: income-driven repayment plans that cap payments as a share of income, deferment and forbearance if you lose your job, and forgiveness programs such as Public Service Loan Forgiveness. A private loan cannot be converted back to a federal one. The calculator compares only the payment and interest math and cannot put a value on those protections. With stable income and strong credit, the interest savings may outweigh them; if your situation is uncertain, the protections can be worth more than a lower rate.

A worked example

Suppose you owe $40,000 at 7% with 120 months remaining. Your current payment is roughly $464 a month. A refinance at 4.5% over a new 120-month term gives a payment of about $415, close to $50 a month less, and because both loans run ten years, a total saving of several thousand dollars in interest. Whether that is worth it depends on whether these are already private loans or federal loans whose protections you would give up.

Assumptions and limitations

This is a planning estimate. It assumes one fixed rate for each loan's whole term, equal monthly payments, and no missed or extra payments. It does not include origination fees (uncommon on refinances but worth checking), variable-rate changes, or interest that capitalizes after you run the numbers, so enter your true starting balance. It does not account for any federal benefits you may lose. Confirm the final figures against your loan agreement and your lender's disclosures before you commit.

About This Student Loan Refinance Calculator

Use this student loan refinance calculator to get an instant estimate based on the figures you enter. Adjust the inputs above to match your situation, or browse all our calculators to plan your next step.