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Student Loan Payoff Calculator
See how quickly you can become debt free. Enter your balance, rate and monthly payment, add an optional extra payment, then press Calculate to see your payoff date and interest saved.
Written by TopicDrill Editorial Team·Updated June 2026
Remaining balance over time
Balance
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How the student loan payoff calculator works
The tool walks through your loan one month at a time. Each month it charges interest on the balance, then applies your payment plus any extra to the principal. It repeats until the balance hits zero, counting the months and adding up every dollar of interest along the way.
To show the payoff in context, it also runs a quiet second simulation using only your minimum payment. The difference between the two is the months and interest you save by committing to that extra amount each month.
A quick example
Say you owe $30,000 at 6.5 percent and pay $350 a month. On the minimum alone the loan runs well over ten years. Add just $100 a month and you clear it years sooner while cutting thousands in interest, because that extra cash never gets the chance to compound against you.
Things to keep in mind
Tell your servicer to apply extra payments to principal, not to push your due date forward, or the savings disappear. For your federal repayment options and forgiveness rules, check StudentAid.gov. If a lower rate is on the table, compare it with our student loan refinance calculator.
Frequently asked questions
How does paying extra each month help?
Every dollar above the scheduled payment goes straight to principal, so less balance is left to accrue interest the next month. That speeds up payoff and lowers total interest. Even a small recurring extra payment can shave months or years off the loan.
Why does my early payment go mostly to interest?
Interest is charged on the outstanding balance, which is largest at the start. So early payments cover a big slice of interest and only chip away at principal. As the balance falls, more of each payment attacks principal, which is why extra payments early on are so powerful.
Should I pay extra or invest the money?
Compare your loan rate with the after-tax return you expect from investing. If the loan rate is higher than that return, paying extra is the guaranteed win. If your rate is low and you have no emergency fund, building savings first is often the safer call.
What if my payment does not cover the interest?
If a payment is smaller than one month of interest, the balance grows instead of shrinking and the loan never amortizes. The calculator flags this so you can raise the payment to a level that actually reduces what you owe.
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