Calculator form
The form uses three columns on large screens, two on smaller screens, and one on mobile devices.
Example data table
| Scenario | Loan amount | APR | Term | Grace | Fee | Extra |
|---|---|---|---|---|---|---|
| Standard undergraduate | $20,000 | 4.99% | 10 years | 6 months | 1.00% | $0 |
| Fast payoff plan | $35,000 | 5.80% | 10 years | 6 months | 1.00% | $75 |
| Graduate program loan | $55,000 | 6.90% | 15 years | 9 months | 3.50% | $125 |
| Refinanced private balance | $18,500 | 4.20% | 7 years | 0 months | 0.00% | $50 |
Formula used
Monthly Payment
M = P × [ r(1 + r)n ] ÷ [ (1 + r)n − 1 ]
P = repayment balance after financed fees and grace capitalization
r = monthly interest rate = annual rate ÷ 12
n = total repayment months
Total interest equals total payments minus the repayment starting balance, with grace-period interest added when it is capitalized.
Extra payments do not change the standard calculated installment. They reduce principal faster, shorten the schedule, and lower interest cost.
How to use this calculator
- Enter your student loan amount and annual interest rate.
- Choose the repayment term in years.
- Add any grace period and origination fee details.
- Include an extra monthly payment to test faster payoff scenarios.
- Select whether fees are financed and whether grace interest is capitalized.
- Press Calculate payment to see the result above the form.
- Use the CSV and PDF buttons to save the schedule and summary.
Frequently asked questions
1. What does this calculator estimate?
It estimates a fixed monthly payment, total interest, total cost, payoff date, and the effect of extra payments for a student loan repayment plan.
2. Why does the grace period matter?
If interest grows during the grace period and gets capitalized, your repayment balance becomes larger. That increases both the monthly payment and the total interest paid later.
3. What is origination fee financing?
Financing the fee adds it to the balance you repay over time. Leaving it unfunded keeps the balance lower, but the fee still counts in your overall borrowing cost.
4. Do extra payments always help?
Usually yes. Extra payments reduce principal faster, shorten the schedule, and cut interest. The benefit is strongest when you start early and keep the extra amount consistent.
5. Is this exact for every lender?
No. Lenders may use daily interest, different capitalization rules, special fees, or alternative repayment plans. This page provides a clear estimate for planning and comparison.
6. What if my interest rate is zero?
The calculator divides the repayment balance evenly across the selected months. In that case, there is no interest cost and extra payments simply shorten the payoff period.
7. Why is my final payment smaller?
The last payment is often reduced because the remaining balance plus that month’s interest is lower than the regular payment amount near the end.
8. Can I use this for refinance comparisons?
Yes. Enter each refinance offer separately, then compare monthly payment, payoff speed, and total interest to see which structure looks more affordable.