How to Use the Student Loan Repayment Calculator
The Student Loan Repayment Calculator helps you estimate your monthly loan payment, total interest costs, and repayment timeline. Whether you're managing federal Direct Loans, PLUS loans, or private student debt, this tool lets you model different scenarios to understand your true cost of borrowing and find the most affordable repayment strategy for your financial situation.
Start by entering your current loan balance (the amount you still owe), your interest rate (found on your loan documents or STUDENTAID.GOV for federal loans), and your desired repayment term or plan type. If you're eligible for income-driven repayment, you'll also input your gross annual income and family size to calculate payments as a percentage of your discretionary income. You can enter extra payment amounts to see how accelerated repayment reduces your timeline and interest burden.
Review the calculator results to compare your total monthly payment, total interest paid, and payoff date across different scenarios. The amortization schedule shows how much of each payment goes toward principal versus interest over time. Use these insights to decide whether to pursue Standard repayment, an income-driven plan, loan consolidation, or an aggressive extra-payment strategy that aligns with your budget and long-term financial goals.
Monthly Payment Estimates by Loan Amount and Interest Rate (10-Year Standard Repayment)
This table shows estimated monthly payments for federal student loans under the Standard 10-year repayment plan at various loan amounts and current interest rates.
| Loan Balance | 5.5% Interest Rate | 6.5% Interest Rate | 8.5% Interest Rate |
|---|---|---|---|
| $15,000 | $283 | $299 | $331 |
| $25,000 | $472 | $498 | $552 |
| $35,000 | $661 | $697 | $773 |
| $50,000 | $944 | $996 | $1,104 |
| $75,000 | $1,416 | $1,494 | $1,656 |
Calculations based on 2024–2025 Federal Direct Loan interest rates. Actual payments may vary based on loan type and accrued interest.
Income-Driven Repayment Plan Comparison (Annual Discretionary Income: $35,000)
This table compares estimated monthly payments under four income-driven repayment plans for a borrower with $40,000 in student loans and $35,000 in discretionary income.
| Repayment Plan | Monthly Payment | Forgiveness Timeline | Interest Subsidy |
|---|---|---|---|
| PAYE (Pay As You Earn) | $292 | 20 years | Yes, during in-school and deferment |
| REPAYE (Revised PAYE) | $292 | 20–25 years | Yes, during forbearance and non-repayment |
| IBR (Income-Based Repayment) | $325 | 25 years | Partial, if new borrower |
| ICR (Income-Contingent Repayment) | $350 | 25 years | No interest subsidy |
Estimates assume 6.5% average loan interest rate. Actual payments are capped at 10–20% of discretionary income depending on plan type and borrower status.
Total Interest Paid Over Loan Lifetime ($30,000 Balance at 6.5%)
This table demonstrates how different repayment terms and extra payments affect the total interest paid on a $30,000 student loan at 6.5% interest.
| Repayment Term | Total Interest Paid | Total Amount Repaid | Extra $100/Month Payment Savings |
|---|---|---|---|
| 10 years (Standard) | $9,450 | $39,450 | −$3,200 interest (7–8 years total) |
| 15 years | $14,850 | $44,850 | −$5,100 interest (10–11 years total) |
| 20 years | $20,750 | $50,750 | −$7,200 interest (13–14 years total) |
| Income-Driven (25 years) | $28,500 | $58,500 | −$10,300 interest (17–18 years total) |
Calculations assume fixed 6.5% interest rate and monthly payments based on selected repayment plan. Extra payment savings show potential interest reduction if applied consistently.
Pro Tips
- Input your actual interest rate from STUDENTAID.GOV or your loan servicer's website—federal rates change annually (currently 8.5% for 2024–2025), and using the correct rate ensures accurate payment estimates.
- Model both the 10-year Standard plan and at least one income-driven plan side by side to compare total interest paid; for example, PAYE may result in $8,000 less interest than standard repayment if your income is lower than your loan balance.
- Add extra principal payments (even $50–$100 monthly) into the calculator to see the cumulative savings; on a $35,000 loan at 6.5%, an extra $75 per month saves approximately $4,200 in interest and shortens repayment by 2–3 years.
- If you're pursuing Public Service Loan Forgiveness (PSLF), use the calculator to project 10 years of payments under PAYE or REPAYE and estimate your potential forgiven balance; for example, 120 payments of $300 leaves a $12,000+ balance eligible for tax-free forgiveness.
Common Mistakes to Avoid
Forgetting to account for capitalized interest
Unpaid interest added to your principal balance increases your total debt during deferment or forbearance periods. Not including capitalization in your calculator input can underestimate your final payoff amount by hundreds of dollars.
Using an incorrect interest rate
Federal loan rates vary by year and loan type (Subsidized vs. Unsubsidized vs. PLUS); using a generic 6% rate when your actual rate is 8.5% can skew payment estimates by $30–$50+ per month. Always verify your rate on STUDENTAID.GOV or your promissory note.
Ignoring income-driven repayment plans if your income is low
If you're earning under $50,000 annually with $30,000+ in loans, an income-driven plan often results in 30–50% lower monthly payments than Standard repayment. Neglecting to calculate PAYE or REPAYE scenarios may leave you overpaying by thousands.
Assuming all extra payments reduce principal immediately
Some loan servicers apply extra payments to the next scheduled payment rather than principal unless you explicitly designate them for principal reduction. Verify your servicer's policy or your calculator results may not reflect the actual interest savings from extra payments.
Frequently Asked Questions
How does the Student Loan Repayment Calculator determine my monthly payment?
The calculator uses your loan balance, interest rate, and repayment term to compute your monthly payment using the standard amortization formula. For example, a $30,000 loan at 6.5% interest over 10 years results in approximately $318 per month. The calculation accounts for both principal and interest portions of each payment.
What's the difference between Standard, Graduated, and Income-Driven repayment plans?
The Standard plan requires equal monthly payments over 10 years (typically $300–$400 for $30,000 in loans). Graduated plans start lower and increase every 2 years, also lasting 10 years. Income-Driven plans (PAYE, REPAYE, IBR, ICR) cap payments at 10–20% of discretionary income and extend repayment to 20–25 years, potentially resulting in forgiveness of remaining balances.
How much total interest will I pay over the life of my loan?
Total interest depends on your loan balance, interest rate, and repayment term. A $25,000 loan at 5.5% over 10 years costs approximately $7,128 in interest, while stretching it to 20 years increases total interest to roughly $15,500. The calculator shows your total interest paid in the results breakdown.
Can this calculator help me compare Federal Direct Loans versus Parent PLUS loans?
Yes, you can use separate calculations to compare repayment scenarios. Federal Direct Loans for 2024–2025 have a maximum interest rate of 8.5%, while Parent PLUS loans carry an 8.25% rate. The calculator allows you to input different rates and terms to see which loan type results in lower monthly payments for your situation.
How does extra principal payments affect my repayment timeline?
Additional principal payments reduce your loan balance faster, decreasing the total interest paid and shortening your repayment term. For example, paying an extra $100 monthly on a $30,000 loan at 6.5% over 10 years could save you approximately $3,500 in interest and eliminate your debt 2–3 years earlier. Most calculators show the impact of lump-sum or recurring extra payments.
What is the Federal Student Loan interest rate for 2024–2025?
Federal Direct Subsidized and Unsubsidized Loans for the 2024–2025 academic year carry a fixed interest rate of 8.5%, while Federal Direct PLUS loans are set at 8.25%. These rates are fixed for the life of the loan and are determined annually by Congress based on the 10-year Treasury note.
How do I know which income-driven repayment plan is best for my calculator inputs?
Use the calculator to model PAYE (Pay As You Earn), REPAYE (Revised Pay As You Earn), IBR (Income-Based Repayment), and ICR (Income-Contingent Repayment) side by side. PAYE and REPAYE typically offer the lowest payments for recent borrowers (10% of discretionary income), while REPAYE includes interest subsidy during forbearance. Your income level and loan amount determine which plan provides the most savings.
What happens if I stop making payments—will the calculator show capitalized interest?
Capitalized interest occurs when unpaid interest is added to your principal balance, increasing the total amount you owe. For example, if interest capitalizes on a $25,000 loan at 6% during a 6-month forbearance period, approximately $750 is added to your principal. The calculator can show capitalization scenarios if you include a deferment or forbearance period in your inputs.
Can the calculator factor in Public Service Loan Forgiveness (PSLF) eligibility?
While a basic repayment calculator doesn't automatically calculate PSLF forgiveness, you can use it to project 10 years of payments under an income-driven plan (the required plan type for PSLF). If your employer is PSLF-eligible and you make 120 qualifying payments, the remaining balance is forgiven tax-free. The calculator helps you see your payment timeline and estimate the forgiven amount.
References & Resources
Last updated: April 2026
- Federal Student Aid – STUDENTAID.GOV
Official U.S. Department of Education resource for current federal loan interest rates, repayment plan options, and loan servicer information.
- Consumer Financial Protection Bureau – Student Loan Repayment
CFPB guidance on student loan repayment plans, borrower rights, and tools to manage federal and private loans.
- IRS Publication 970 – Tax Benefits for Education
Internal Revenue Service documentation on student loan interest deductions, tax credits, and forgiveness tax implications.
- Federal Student Aid – Income-Driven Repayment Plans
Detailed comparison of PAYE, REPAYE, IBR, and ICR plans, including eligibility, payment calculations, and forgiveness timelines.