Student loan refinancing replaces one or more existing student loans with a single new private loan, ideally at a lower interest rate. The move can cut years of interest off your debt, lower your monthly payment, or both — but it is not free, and refinancing federal loans into a private product costs you the federal borrower protections that made those loans valuable in the first place. This calculator compares your current payment against a quoted refinanced payment and shows the monthly change, the interest saved, and how long it takes to recover any fees.
Adjust the inputs and every figure updates instantly. Enter the balance you actually owe today (not your original loan amount), your current blended rate, how many years of payments remain, the new rate and term a lender has quoted you, and any fees.
How to Use
- Enter the Current Student Loan Balance — the total principal you still owe across all loans, taken from your most recent statements or your federal aid dashboard.
- Set your Current Blended Interest Rate. If you hold several loans at different rates, average them by balance: multiply each loan's rate by its share of the total, then add them up.
- Choose Years Left on Current Loans — the time until your current repayment schedule reaches a $0 balance.
- Type the New Refinance Rate a private lender has quoted you. Compare at least three offers; preapproval inquiries for student loans usually do not hurt your credit if completed within a short window.
- Pick the New Refinance Term (5, 8, 10, 15, or 20 years). A shorter term usually earns a lower rate but raises the monthly payment; a longer term lowers the payment but stretches out interest.
- Add any Refinance Origination / Closing Fees. Most student-loan refinancers charge no origination fee, but enter it here so the break-even math is honest.
- Optionally, set the Share That Is Federal. If any of your balance is federal, the calculator flags that refinancing it privately means you will permanently lose income-driven repayment (IDR) and Public Service Loan Forgiveness (PSLF) eligibility.
The result card shows your current monthly payment, the new payment, the monthly savings (or increase), the break-even point in months, and the total interest saved over the new loan.
How the Math Works
Your monthly payment uses the standard amortization formula used by the U.S. Department of Education and every major lender:
M = P × r(1 + r)ⁿ / ((1 + r)ⁿ − 1)
Where P is the balance, r is the monthly rate (annual APR divided by 12), and n is the number of monthly payments. The interest left on your current loan is the monthly payment times the remaining months, minus the principal; the interest on the new loan is computed the same way at the new rate and term. The difference between those two interest totals is the interest you save. Break-even is simply the refinance fee divided by the monthly savings — the number of months it takes for the lower payments to pay back the upfront cost.
Worked example: a $50,000 loan at 6.5% over 10 years costs about $567.74 per month. Refinancing the same balance to 4.5% over 8 years pushes the payment up to $621.16 per month — that is roughly $53 more each month. Yet because the loan pays off two years faster and at a lower rate, total interest drops from about $18,129 to $9,632, saving around $8,497 over the life. This is the key insight: a refinance can raise your monthly bill and still be worth it when the term shortens.
If the rate is 0%, the formula would divide by zero, so the engine simply splits the principal evenly across the number of months.
Examples
Example 1 — The canonical rate-and-term refinance. A graduate owes $50,000 at 6.5% with 10 years left. A lender offers 4.5% over 8 years with no fees. The current payment is $567.74/month; the new payment is $621.16/month. The monthly cost rises by about $53, but interest falls by roughly $8,497. Because there are no fees, the break-even point is immediate — the decision is purely whether you can comfortably carry the higher payment.
Example 2 — A pure payment reduction. A borrower holds $75,000 at 7.5% over 10 years and refinances to 5.0% over the same 10-year term, paying $1,500 in fees. The monthly payment drops from $890.26 to $795.49, a saving of about $94.77 per month. It takes roughly 15.8 months to recover the $1,500 fee, after which every month is pure savings — about $11,373 of interest saved in total.
Example 3 — A large consolidated balance. A household refinances a consolidated $1,000,000 portfolio from 6.0% to 4.5% over 15 years with no fees. The monthly payment falls from about $8,439 to $7,650, and total interest saved is roughly $142,000. Large balances magnify even a small rate cut, which is why shopping the rate matters most when the principal is big.
FAQ
Is refinancing student loans worth it?
It is usually worth it when you qualify for a meaningfully lower rate (typically at least 1–2 percentage points), you are not relying on federal protections, and you plan to keep the loan long enough to clear the break-even point. If the new loan has fees, divide them by your monthly savings to see how many months it takes to come out ahead.
Will refinancing lower my monthly payment?
Not always. Extending the term or lowering the rate — or both — lowers the payment. But shortening the term (for example, moving from 10 years to 8) often raises the payment even at a lower rate, because you are paying the principal back faster. This calculator shows the monthly change explicitly so you are not surprised.
Can I refinance federal student loans?
Yes, technically — a private lender will pay off your federal loans and issue a new private loan. But doing so permanently removes federal benefits: income-driven repayment (IDR) caps, the possibility of Public Service Loan Forgiveness (PSLF), deferment and forbearance options, and certain discharge protections. Only refinance federal loans if you are confident you will not need those safety nets.
What credit score do I need to refinance?
Most student-loan refinancers look for a credit score in the high 600s or better, a steady income, and a low debt-to-income ratio. Borrowers with weaker credit can often qualify by adding a creditworthy co-signer, which is one of the most common ways to unlock a lower rate.
Are there fees to refinance student loans?
Many of the largest student-loan refinancers advertise $0 origination and $0 application fees, with no closing costs. That is why the default fee in this calculator is $0. Still, always read the offer for any origination percentage, late fee, or prepayment penalty before applying.
How many times can I refinance student loans?
There is no legal limit. You can refinance as many times as a lender will approve you, and each refinance resets the loan with a new term. Just remember that every new application can trigger a hard credit inquiry, and repeatedly refinancing a shrinking balance may eventually produce negligible savings.
Does refinancing remove a co-signer?
Some lenders offer a co-signer release program after a string of on-time payments (often 24–36 months). If your goal is to release a parent or spouse who co-signed your original loans, ask prospective refinancers whether they offer release and at what milestone.
Disclaimer
This student loan refinance calculator is provided for informational purposes only and does not constitute financial, lending, tax, or legal advice. Estimates are based on the inputs you enter and the standard amortization formula; actual offers, rates, fees, and terms vary by lender, credit profile, income, and state. Refinancing federal loans into a private loan will cause you to lose federal borrower protections. Always compare multiple offers and confirm your final terms directly with a licensed lender or student-aid counselor before committing.