Plan prepayments confidently with detailed loan inputs. See monthly impact, payoff reduction, and savings instantly. Make better borrowing choices through clear repayment comparisons today.
| Scenario | Balance | Rate | Term | Extra Monthly | One-Time Payment | Annual Extra |
|---|---|---|---|---|---|---|
| Example A | $25,000 | 5.20% | 10 years | $100 | $1,500 at month 12 | $600 |
| Example B | $42,500 | 6.80% | 15 years | $200 | $2,000 at month 18 | $1,200 |
| Example C | $60,000 | 7.10% | 20 years | $350 | $5,000 at month 24 | $2,400 |
The standard monthly payment uses the fixed amortization formula: M = P × [r(1+r)^n] ÷ [(1+r)^n − 1].
Here, P is the current balance, r is the monthly interest rate, and n is the remaining number of months.
Each month, interest is added first. Then the regular payment reduces principal. Extra monthly, one-time, and annual prepayments reduce principal further.
Interest savings equal the standard schedule interest minus the prepayment schedule interest. Time savings equal the difference between both payoff lengths.
Enter your current student loan balance and annual interest rate.
Provide the remaining term in years for the loan.
Add any extra monthly payment you plan to make.
Optionally include a one-time lump sum and payment month.
Add a recurring annual extra payment if you use bonuses.
Click the calculate button to view savings and payoff changes.
Use the chart to compare how quickly the balance falls.
Download the results as CSV or PDF for records.
It estimates how extra payments can shorten payoff time and reduce total interest. It compares a standard repayment path with your planned prepayment strategy.
It works best for fixed-rate loans using standard amortized payments. Variable-rate loans may change over time, so actual results can differ from these estimates.
A lump sum can cut principal early, which lowers future interest charges. Earlier extra payments usually create larger savings than later ones.
Extra monthly payments consistently reduce principal. That lowers interest accrual every month and often shortens the repayment term significantly.
Many borrowers make yearly bonus payments, tax refund payments, or seasonal extra contributions. This field helps model those recurring strategies more realistically.
No. This tool focuses on principal, interest, and prepayment timing. Servicing fees, tax effects, and forgiveness programs are not included.
Yes. Change the extra monthly, one-time, and annual inputs to test different plans. Then compare interest savings and payoff reductions across scenarios.
Lenders may apply payments on different dates or use different posting rules. Variable rates, deferment periods, and policy changes also affect real outcomes.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.