Student Loan Debt Calculator
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Estimate college loan payments, total interest and payoff time from your balance, fixed rate and repayment term. Add an extra monthly payment to see how much sooner you could finish.
Enter Your Details
Use the rate on your loan statement; 5.5% is a worked-example rate. This models fixed monthly payments. For income-based payments and federal plan eligibility, use the Federal Student Aid Repayment Calculator.
Decision Support System
Worked example: $35,000 at 5.5% for 10 years — click Calculate to use your inputs
Quick Answer
fincalcs.coWhat will my student loan payment and total interest be?
$379.84/month on $35,000 at 5.5% over 120 months. Total repaid: $45,581.04; interest: $10,581.04. Adding $100/month saves $2,880.48 and 31 months.
2026–27 Federal Student Loan Rates
DATED REFERENCE fincalcs.coSource: Federal Student Aid interest rates. Existing loans keep their own rates. The repayment recap uses the $35,000 example until you calculate, then reflects your entered loan and extra payment. It is calculated here, not a community average.
Student Loan Analysis
UPDATES ON CALCULATE$35,000 at 5.5%: $379.84 scheduled monthly payment
The worked example has $10,581.04 interest over 120 payments, or 30.2% of the starting balance. Add an extra payment to compare interest and time saved.
How the Interest Rate Changes Payment
WORKED EXAMPLES fincalcs.coThe same $35,000 loan repaid over 10 years with no extra payments. The dated federal rates are references for new loans; the other rates are hypothetical.
| Rate scenario | Rate | Monthly Payment | Total Repaid | Total Interest | Interest % |
|---|---|---|---|---|---|
| Illustrative lower rate | 4.50% | $362.73 | $43,528.13 | $8,528.13 | 24.4% |
| Page worked example | 5.50% | $379.84 | $45,581.04 | $10,581.04 | 30.2% |
| Undergraduate Direct reference | 6.52% | $397.77 | $47,732.90 | $12,732.90 | 36.4% |
| Graduate Direct Unsubsidized reference | 8.07% | $425.94 | $51,113.07 | $16,113.07 | 46.0% |
| Direct PLUS reference | 9.07% | $444.69 | $53,363.07 | $18,363.07 | 52.5% |
| Illustrative higher rate | 10.50% | $472.27 | $56,672.70 | $21,672.70 | 61.9% |
Payments retain full precision internally and are displayed to cents. These scenarios do not establish loan eligibility, available repayment terms or a refinancing offer.
Interest Cost Ratio
How much extra you pay in interest relative to your loan balance — lower is better.
Cost Breakdown
CALCULATEDYour Balance and the Worked Example
The $35,000 worked example is a comparison point, not a national average or a financial-health rating.
Compare Your Next Steps
Use your budget, other debts and federal plan options alongside the estimate. A longer fixed-payment term can lower the monthly amount while increasing total interest.
What Changes Everything
After Debt: Your Wealth Projection
Once your loan is paid off, redirect your $379.84/mo payment into investing:
Assumes a constant 7% nominal annual return, compounded monthly, with end-of-month contributions. Excludes taxes, fees and inflation. Returns are not guaranteed; periods start after payoff.
→ See your compound growth projectionIllustrative Interest at the Starting Balance
What Should You Do Next?
UPDATES ON CALCULATEUse the calculation to compare costs, then check the terms and options that apply to your loans.
→ Calculate your accelerated payoff
→ Explore forgiveness assumptions
→ View FC Benchmarks
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Was This Analysis Helpful?
This calculator is for informational and educational purposes only. Results are estimates based on the information you provide and standard financial formulas. This is not financial advice. Consult a qualified financial advisor for decisions specific to your situation. Full Disclaimer
Learn More about Student Loans
Things to Know
Essential concepts for understanding your results
Repayment PlansWhat are the different repayment plan options?
The term selector compares fixed monthly repayment scenarios. It does not enroll you in a federal plan. For income-driven and other federal options, use the Federal Student Aid Repayment Calculator and confirm your loan’s eligibility with the servicer.
Interest AccrualHow does student loan interest work?
This calculator estimates interest each month as the outstanding principal multiplied by the annual rate divided by 12. At $35,000 and 5.5%, the first month’s modeled interest is $160.42. Interest falls as principal is repaid. Your servicer’s daily accrual and payment dates can produce a different final payoff.
Forgiveness ProgramsWho qualifies for student loan forgiveness?
Forgiveness is separate from a fixed-payment payoff estimate. Eligibility can depend on the loan, employment, qualifying payments and program requirements. Check official Federal Student Aid guidance before assuming a balance will be forgiven or deciding to accelerate payments.
Refinancing Trade-offsShould you refinance student loans?
A lower quoted rate can reduce interest, but compare the term, fees and protections too. Private refinancing of federal debt removes federal repayment and forgiveness benefits. The 4.5% scenario on this page is an illustration, not an offer or an approval prediction.
How to calculate student loan payments
Use this student loan debt calculator to estimate a fixed monthly payment, total interest and a payoff date for a college loan already in repayment. Enter the outstanding balance, your actual annual interest rate, the remaining repayment term and any extra monthly payment. The default 5.5% is an example rate, not a current federal rate or a lender quote.
For several loans with different rates or terms, calculate each separately and add the payments. A balance-weighted rate can approximate a combined loan only when the repayment assumptions match; it cannot reproduce separate balances, different due dates or targeted extra payments. If you want to test more extra-payment amounts, use the student loan payoff calculator.
Worked example: $35,000 of college debt
At a fixed 5.5% annual rate over 120 months, the calculated base payment is $379.84 per month. Total repayment is $45,581.04, including $10,581.04 interest. Adding $100 monthly raises the planned payment to $479.84, pays the loan off in 89 months and reduces interest to $7,700.56. That saves $2,880.48 and 31 months; the last modeled payment is $474.47.
The formula and model assumptions
With balance B, monthly rate r (annual interest rate as a percentage divided by 1,200) and n payments, the base payment is B × r ÷ [1 − (1 + r)−n]. At 0% interest it is B ÷ n. Each month the model adds interest to the remaining principal, applies the base payment plus the extra amount, and caps the final payment at what remains owed.
The model retains unrounded payments internally and rounds displayed dollars to cents. It assumes a constant rate, payments at monthly intervals starting next month and no missed payments, fees, deferment, capitalization, subsidy or forgiveness. Student loan servicers may accrue interest daily and round each transaction, so their final payoff quote can differ. Use the current principal and check separately for unpaid interest and charges before treating an estimate as an amount due.
Federal and private student loans
The same fixed-payment math can illustrate either type of loan. The repayment rights are different, so identify each loan before making a plan. Federal loan information is available in your StudentAid.gov account; private loan terms come from your lender and agreement.
| Question | Federal loans | Private loans |
|---|---|---|
| Which rate should I enter? | The rate on that specific loan | Your contract rate; a variable rate may change |
| Where do I check payment options? | Federal Student Aid and your servicer | Your lender’s repayment and hardship terms |
| Does this calculator establish eligibility? | No; federal plan and forgiveness rules are separate | No; lender approval and terms are separate |
See the CFPB’s federal and private repayment guidance if payments become difficult. Contact your servicer before assuming a payment pause is available.
Which student loan interest rate should I use?
Use your statement’s rate for an existing loan. A newly announced federal rate does not replace the fixed rate on an older loan. Federal Student Aid lists 6.52% for undergraduate Direct Subsidized and Unsubsidized loans, 8.07% for graduate/professional Direct Unsubsidized loans and 9.07% for Direct PLUS loans first disbursed from July 1, 2026 through June 30, 2027. Rate information alone does not establish eligibility for a loan type.
Source: Federal Student Aid interest rates, checked October 24, 2026. The dated rate reference above is separate from the editable calculator input. For a private variable-rate loan, run more than one rate scenario rather than assuming today’s rate lasts through payoff.
Compare repayment terms and total interest
Extending a fixed-payment term reduces the monthly amount but leaves the principal accruing interest longer. Here is the same $35,000 balance at 5.5%, with no extra payments. These are mathematical scenarios, not a list of federal plans you qualify for.
| Term | Monthly payment | Total interest | Total repaid |
|---|---|---|---|
| 10 years | $379.84 | $10,581.04 | $45,581.04 |
| 15 years | $285.98 | $16,476.26 | $51,476.26 |
| 20 years | $240.76 | $22,782.53 | $57,782.53 |
| 25 years | $214.93 | $29,479.19 | $64,479.19 |
In this example, 25 years lowers the payment by $164.91 compared with 10 years, but adds $18,898.15 of interest. For another fixed-payment comparison, visit the student loan repayment calculator. Check official plan rules separately.
Need an income-based student loan calculator?
This calculator does not use income, family size or federal loan history, so it cannot estimate an income-driven repayment payment or forgiveness. For that task, use the Federal Student Aid Repayment Calculator, previously called Loan Simulator. It compares available options using your loan and household information; confirm the resulting terms with your servicer.
Federal plan eligibility can depend on loan type and disbursement dates. Avoid choosing a plan from an old comparison table. In particular, Federal Student Aid reports that a court order ended SAVE in March 2026. Its SAVE borrower guidance explains how affected borrowers should choose another eligible plan. Sources checked October 24, 2026: Repayment Calculator guide and SAVE guidance.
How forgiveness affects a payoff comparison
A fixed-payment payoff schedule assumes you repay the entire modeled balance. It cannot tell you whether you qualify for forgiveness or whether extra payments would reduce the amount eventually forgiven. Before accelerating a federal loan, review the relevant program, qualifying payment history and employment requirements through Federal Student Aid’s PSLF guidance and your account.
The FinCalcs forgiveness calculator and PSLF tracker can help organize assumptions; official program rules and your servicer’s records determine eligibility. Do not interpret a projected remaining balance as an approved discharge.
How extra payments change student loan payoff
Compare the no-extra result with an amount you can repeat each month. In this model, the scheduled interest is paid first and the remaining payment reduces principal. A smaller principal creates less interest in later months. The savings depend on your balance, rate and timing; there is no universal dollar saving from adding $100.
For the $35,000 example, that extra $100 saves $2,880.48. At 0% interest it saves no interest but can still shorten repayment. If an extra payment exceeds the entire amount owed, the model caps it at the payoff amount instead of counting an overpayment.
If you have several debts, list each balance, rate and required payment. The personal loan calculator can estimate a separate installment loan, while the student loan payoff calculator helps explore your student debt payment. Confirm your servicer’s instructions for directing additional payments to a specific loan and keep required payments current.
Compare refinancing without confusing it with consolidation
Private refinancing replaces debt with a new private loan. Federal consolidation combines eligible federal loans and uses a weighted-average rate rounded up to the nearest one-eighth percentage point; it is not automatically a rate reduction. The CFPB explains the distinction and trade-offs.
To isolate a rate change, keep the balance and remaining term the same. On $35,000 over 10 years with no extra payments, 5.5% gives $379.84 monthly and $10,581.04 interest. A hypothetical 4.5% gives $362.73 monthly and $8,528.13 interest: $2,052.91 less interest before fees. If your existing rate is below 4.5%, that illustration increases cost instead.
Compare the quoted APR, fees, fixed or variable rate, term and borrower protections. A lower payment obtained by restarting a longer term may cost more overall. Refinancing federal loans privately removes federal repayment and forgiveness benefits, and the change cannot be reversed. A lower rate alone does not settle that trade-off.
Pay off student loans or invest?
The calculator can measure interest avoided under its assumptions; it cannot forecast investment returns. Compare your loan cost with several investment assumptions and consider cash reserves, other debts, taxes, fees and any employer retirement benefit terms. An assumed market return is not guaranteed and should not be treated as a risk-free spread over your loan rate.
The “After Debt” panel illustrates investing the selected payment after payoff at a constant 7% annual nominal rate compounded monthly. It assumes end-of-month contributions and excludes taxes, fees and inflation. Its time periods begin after the loan is repaid. Change the assumptions in the compound growth calculator or explore paying off loans versus investing.
Student loan interest and taxes
The payoff results do not include tax deductions or tax on forgiven debt. IRS Topic 456 describes a deduction of up to $2,500 of qualifying student loan interest for the 2025 tax year, subject to income, filing-status and other requirements. It is a deduction rather than a dollar-for-dollar credit. Check the IRS student loan interest guidance for the tax year you are filing instead of applying old phaseout limits to a later return. For a broader estimate, see the income tax calculator.
Put the monthly payment in your budget
A national balance average cannot show whether your payment fits your income and expenses. Compare the calculated monthly amount with your own take-home pay, housing, other required debt payments and cash reserve. The $35,000 comparison bar on this page is the worked example, not a national average or approval threshold.
For example, a $379.84 student loan payment is 7.60% of $5,000 monthly gross income. That is only the student-loan component. The debt-to-income ratio calculator includes other monthly debts and housing; lender rules for documenting a student loan payment can differ from this estimate.
Before your first repayment bill
Confirm your servicer, contact details, current balance, interest rate and first due date. Direct Subsidized and Unsubsidized loans generally have a six-month grace period after leaving school or dropping below half-time enrollment; other loan types can differ. Check the repayment options for your loan dates and any current automatic-payment discount with your servicer.
Use Federal Student Aid’s preparation checklist for the current steps. If the amount is unaffordable, contact the servicer about available options before missing a payment. This calculator does not enroll you in a plan or change a due date.
Common repayment calculation mistakes
- Using a new-loan rate for old debt. Enter the rate on your actual loan.
- Treating a longer term as savings. Compare total interest as well as the monthly payment.
- Ignoring separate loans. Different rates and terms need separate estimates.
- Assuming a fixed payoff result is an IDR payment. Income-driven plans need household and loan eligibility information.
- Counting a refinancing illustration as an offer. Include actual terms, fees and changed protections.
- Using an estimate as a final bill. Obtain a dated payoff quote from your servicer.
Student loan calculation terms
See also the student loan and income-driven repayment glossary entries. Use official sources for current program requirements.
Principal: The loan balance on which modeled interest is calculated. Interest rate: The annual rate used to estimate interest; this page divides it by 12 for monthly calculations. APR: An annualized borrowing-cost measure that can incorporate fees; check a lender’s disclosures rather than replacing the contract rate without accounting for those fees.
Amortization: Repaying a balance through a payment schedule. Capitalization: Adding unpaid interest to principal under applicable loan terms. Extra payment: An amount above the calculated base payment. Refinancing: Replacing an existing loan with a new loan. IDR: Income-driven repayment, with payments and eligibility governed by a federal plan’s rules rather than this fixed-payment formula.
Student loan calculator questions
At a fixed 5.5% annual rate over 10 years, the modeled payment is $379.84 per month. Total interest is $10,581.04. Your payment changes with the rate and repayment term; these are example assumptions, not a lender quote.
For $35,000 at 5.5% over 120 months, adding $100 to the base payment reduces payoff to 89 months and saves $2,880.48 in interest. The last modeled payment is $474.47. Different inputs produce different savings.
No. This page models fixed-rate monthly amortization and extra payments. Use the Federal Student Aid Repayment Calculator for current federal plan options based on your loans and household information.
Yes, for a fixed-rate repayment estimate. Enter the rate and remaining term from your loan agreement. A variable-rate loan needs several rate scenarios. Fees, rate changes, payment pauses and capitalized interest are outside this model.
Calculate each loan separately when rates or remaining terms differ, then add the monthly payments. A single combined balance cannot reproduce different due dates, interest rates or extra-payment allocation.
This model uses monthly interest and unrounded payments internally. Daily accrual, actual payment dates, transaction rounding, unpaid interest and fees can change a servicer’s figure. Request a dated payoff quote before making a final payment.
Yes. On the $35,000 example at 5.5%, extending the term from 10 to 25 years reduces the modeled monthly payment from $379.84 to $214.93 but increases total interest from $10,581.04 to $29,479.19.
No. It assumes full repayment and does not assess employment, qualifying payments or federal program rules. Check Federal Student Aid and your servicer before using extra payments in a forgiveness strategy.
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