Should I Refinance My Variable Rate Student Loan?
This calculator helps you decide whether to refinance an existing variable-rate student loan into a fixed-rate loan. Enter your current variable rate, a fixed refinance offer, your balance, and remaining term. The tool compares the total cost of staying on the variable at its current level against locking in the fixed rate today.
In this scenario you save
Difference between the two
by taking the variable rate — even after it rises to in .
by taking the fixed rate. The rise you modelled wipes out the variable loan's head start.
The two land within a dollar of each other on these numbers.
- Over FixedVariable
- Payment at the start
- Payment after the rise
- Interest paid
- Total paid
The variable loan stops being the cheaper one once the rate climbs past at that same month.
The variable loan is modelled the way lenders handle a rate change: the remaining balance is re-amortised over the remaining term at the new rate, so the payment jumps by . Real variable rates move more than once and have their own caps — check the loan agreement.
When Your Variable Rate Has Become Expensive
Variable student loan rates are benchmarked to SOFR plus a lender-set margin. When SOFR rises, your rate and monthly payment rise with it. If the rate you are paying today is above the fixed-rate refinance offer you have received, you are already spending more per month than you would on the fixed loan. The longer you wait, the more that premium accumulates as extra interest.
The calculator quantifies the gap in two ways. First, it shows the monthly payment difference at the current variable rate versus the fixed offer. Second, it projects total interest over the remaining term if the variable rate stays at its current level. Both numbers help you see whether the variable has already cost you enough to justify the switch. If you believe rates will fall soon, you can test that by running the tool again with a lower variable rate to see whether the savings from a future decline outweigh the interest you pay while waiting.
What You Trade When You Lock In
Locking in a fixed rate through refinancing means your payment never changes, which simplifies budgeting and eliminates the risk of further rate increases. The trade-off is that if benchmark rates drop significantly, your fixed rate does not follow them down. You can refinance again in the future, but that involves new closing costs and a new credit check.
If the loan you are refinancing is a federal variable-rate loan, converting to a private fixed-rate loan permanently eliminates access to income-driven repayment, PSLF, forbearance, and disability discharge. This loss matters most for borrowers whose income is uncertain or who may qualify for forgiveness. The calculator does not assign a dollar value to those protections; it focuses on the interest-rate math. Weigh the net savings figure it produces against the value of the protections you hold. For a side-by-side rate comparison that models a future rate rise, see the fixed-vs-variable refinance rates page.
Variable rates depend on SOFR plus lender margin and are subject to lender terms. All rate examples are illustrative. This is not a rate offer.
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Related student loan calculators
- Variable Student Loan Payment Increase Calculator
- Fixed vs Variable Student Loan Refinance Break Even
Sources
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Sources: SOFR benchmark (newyorkfed.org); ed.gov federal loan protections; standard amortization math.
- Federal Direct Consolidation Loan interest rate — the weighted average of the loans being consolidated, rounded up to the nearest one-eighth of one percent (Federal Student Aid, studentaid.gov, Loan Consolidation).
- Amortisation, daily interest accrual and payoff arithmetic — standard loan mathematics; every figure on this page is computed from the numbers you enter.