Calculate exactly how much interest you will save and how many years you will shave off your student debt by adding extra monthly principal payments.
| Metric | Standard Plan | With Extra Payments |
|---|---|---|
| Monthly Payment | $333.06 / mo | $433.06 / mo |
| Payoff Timeline | 120 Months (10y) | 89 Months (7.4y) |
| Total Interest Paid | $9,967 | $7,204 |
| Total Amount Repaid | $39,967 | $37,204 |
Student loan interest accrues daily using the simple daily interest formula: Daily Interest = (Unpaid Principal × Interest Rate) ÷ 365.25.
When you make only your standard minimum payment, a significant portion goes to accrued interest. But when you make an extra monthly payment applied directly to principal, you immediately reduce the balance on which future daily interest is calculated. This creates a compounding effect in reverse: every extra dollar reduces next month's interest, forcing even more of your regular monthly payment toward principal.
Worked Example: On a $30,000 balance at 6.0% APR over 10 years, your standard monthly payment is $333.06, totaling $9,967 in interest. Adding just $100 extra per month increases your payment to $433.06. This wipes out the debt in 89 months (7.4 years) instead of 120 months, eliminating 31 months of payments and saving $2,763 in pure interest!
* Disclaimer: This calculator does not model Income-Driven Repayment (IDR) forgiveness or Public Service Loan Forgiveness (PSLF). If you are pursuing forgiveness, making extra payments may reduce your overall forgiveness benefit.
Prioritize multiple student loans and credit cards to minimize total interest paid.
See how your monthly student loan obligations impact your home mortgage qualification.
Calculate fixed payments and amortization schedules for debt refinancing loans.
Forecast future tuition inflation and monthly contributions to avoid student debt.