Find the monthly payment needed to pay off your student loan within a set term — or flip it around and see how long it'll take to pay off at a fixed monthly payment.
| # | Payment | Principal | Interest | Balance |
|---|
Enter Student Loan Details
Choose Fixed Term or Fixed Payment mode, fill in the details, then click Calculate to see your full breakdown.
A student loan calculator answers the two questions almost every borrower actually has: what monthly payment will clear my balance in a set number of years, and how long will payoff take at a payment I can actually afford? NeftCal's student loan calculator solves both directions of that problem. Switch to Fixed Term mode to find the monthly payment needed to pay off a loan balance within a chosen number of years, or switch to Fixed Payment mode to enter a monthly payment you plan to make and see exactly how many years and months it takes to reach a zero balance. It works for federal loans (Direct Subsidized, Direct Unsubsidized, Parent PLUS, Grad PLUS) and private student loans alike, since the underlying amortization math is the same regardless of the loan program's name.
Because student debt is often the largest recurring line item in a young borrower's budget, small differences in interest rate, remaining term, or monthly payment compound into thousands of dollars of total interest over the life of a loan. This tool converts your loan balance, interest rate, and either your term or your target payment into a clear monthly payment (or payoff-time) figure, a full amortization schedule, and principal-vs-interest charts — all calculated instantly in your browser, in nine currencies, with no signup required.
This tool is built for current students and recent graduates estimating their first standard repayment plan, borrowers weighing whether extra payments are worth the sacrifice, anyone comparing a private refinance quote against their current federal rate, parents evaluating a Parent PLUS loan payment, and graduate or professional students sizing up Grad PLUS debt before enrolling. It's equally useful as a quick "can I afford this?" gut-check and as a detailed side-by-side comparison across different terms, rates, and payment amounts.
Federal and private student loans behave differently — federal loans generally carry fixed rates set annually by Congress and pair with borrower protections like income-driven repayment, deferment, and forgiveness programs; private loans are priced on credit and can carry fixed or variable rates with fewer built-in hardship options. Both, however, amortize the same way once you're in standard repayment: a fixed rate applied to a shrinking balance. Understanding your real monthly payment and total interest — before you accept a loan, before you refinance, and before you decide how much extra to pay — is one of the highest-leverage financial planning decisions a borrower with student debt can make, since interest on a 10-year loan can add up to 25–35% of the original balance.
Two ways to look at the same loan, depending on what you already know
Fixed Term mode starts from how many years you have left and solves for the monthly payment needed to clear the balance in that time. Fixed Payment mode does the reverse — enter the monthly payment you plan to make, and it solves for how long payoff will actually take.
In Fixed Payment mode, if your monthly payment doesn't even cover the interest accruing each month, the balance will never shrink. The calculator will flag this and show you the minimum payment needed just to cover accruing interest.
Standard repayment on a Direct Subsidized, Direct Unsubsidized, Parent PLUS, Grad PLUS, or private student loan all amortize the same way once repayment begins: a fixed rate applied to a shrinking balance. Enter your actual balance and rate and this formula applies regardless of loan program name.
From loan balance to monthly payment or payoff time in under a minute
Input your current outstanding student loan balance and select your currency from the 9 supported options. Use your loan servicer's latest statement balance, not your original disbursed amount, for the most accurate result.
Pick Fixed Term to solve for the monthly payment needed to pay off your loan in a set number of years, or Fixed Payment to solve for how long payoff will take at a payment amount you choose.
In Fixed Term mode, enter how many years you have left to repay (the standard federal plan defaults to 10 years). In Fixed Payment mode, enter the fixed monthly payment you plan to make.
Enter the annual percentage rate (APR) from your loan agreement or servicer statement. The calculator shows a typical-range hint to help you sanity-check your entry — but always use your exact rate rather than a general estimate.
Instantly see your monthly payment or payoff time, total interest, total amount paid, a principal-vs-interest chart, a year-wise breakdown chart, and a 12-month amortization schedule.
A realistic standard-repayment student loan calculation, step by step
Suppose you owe $25,000 in student loans at 5.5% APR, and you have the standard 10-year (120-month) federal repayment term remaining. You want to know your required monthly payment — Fixed Term mode.
| Payment # | Payment | Interest | Principal | Remaining Balance |
|---|---|---|---|---|
| 1 | $271.32 | $114.58 | $156.73 | $24,843.27 |
| 2 | $271.32 | $113.86 | $157.45 | $24,685.82 |
| 3 | $271.32 | $113.14 | $158.17 | $24,527.64 |
Explanation: Even at a relatively modest 5.5% rate, this loan costs $7,557.88 in interest over 10 years — about 30% of the original balance. Notice how the interest portion of each payment ($114.58 in month 1) slowly shrinks and the principal portion grows every month as the reducing-balance effect takes hold.
Fixed Payment comparison: Now suppose instead you commit to paying $280 a month — about $8.68 more than the required $271.32 — on that same $25,000 balance at 5.5% APR. Switching to Fixed Payment mode, the calculator solves n = −log(1 − B×r÷M) ÷ log(1+r) and finds payoff in 116 months, or 9 years 8 months — 4 months sooner — with total interest of about $7,227.18. That's roughly $330 less interest for an extra $8.68 a month, a small illustration of how even modest extra payments compound into real savings over a decade.
What your monthly payment actually means for your budget
A commonly cited personal-finance rule of thumb is to keep your student loan payment-to-income ratio — your monthly payment divided by your gross (pre-tax) monthly income — within a manageable band. It isn't a regulatory requirement, but it's a useful gut-check once this calculator gives you a monthly payment figure.
| Payment as % of Gross Monthly Income | General Read | Typical Context |
|---|---|---|
| Under 8% | Comfortable, low burden | Modest balance, strong starting salary, or a longer term |
| 8% – 15% | Manageable but tight | Typical for many bachelor's-degree borrowers on a standard 10-year plan |
| Over 15% | High burden — worth exploring options | Common with graduate/professional debt or shorter terms; consider IDR, refinancing, or extending the term |
For federal loan borrowers: if your calculated standard payment feels unaffordable against this ratio, income-driven repayment plans (which base your payment on discretionary income rather than balance) may lower it substantially — this calculator doesn't model those plans, so check studentaid.gov's official Loan Simulator to estimate an income-driven payment specifically.
For private loan borrowers: since private loans generally lack income-driven options, a high ratio here is a stronger signal to consider refinancing for a lower rate or negotiating a longer term with your lender — run both scenarios through Fixed Term mode to compare.
Risk considerations: this calculator models a fixed-rate, fixed-schedule loan making every payment on time. It doesn't capture rate changes on variable-rate private loans, missed-payment fees or credit-score impact, or interest capitalization if you use deferment or forbearance. Treat the result as a planning baseline, not a guarantee of your actual payoff date.
This tool provides general educational estimates only and is not repayment-plan, loan-forgiveness, tax, or financial advice. Program rules for income-driven repayment and forgiveness (including PSLF) change over time — always confirm current eligibility and terms directly with your loan servicer or at studentaid.gov before making a repayment decision.
Where this calculator earns its keep for borrowers
Find your required monthly payment on the standard federal 10-year repayment plan.
Compare the standard payment here against an IDR estimate from studentaid.gov to see the gap.
Run your current balance and rate, then compare against a private refinance lender's quoted rate.
Estimate the payment on a consolidated balance and rate before combining multiple loans.
Run each loan type's balance and rate separately to see how they differ in monthly cost.
Estimate the monthly payment a parent will owe on a Parent PLUS loan before signing.
Project payments on graduate or professional school debt, which often carries a higher balance and rate.
See exactly how much faster you're debt-free by adding a fixed amount to your minimum payment.
Compare total interest across several refinance offers using the same balance and term.
Estimate your future payment before you graduate so you can budget for it in advance.
Model the payment that will kick in once your six-month grace period ends.
Sanity-check the payment or payoff date your loan servicer shows against an independent calculation.
What this student loan calculator does well, and where it can't replace your servicer or an advisor
Informational overview — this calculator models the Standard/fixed structure; the other rows are context from studentaid.gov
| Feature | Standard Repayment | Income-Driven Repayment (IDR) | Private Refinancing |
|---|---|---|---|
| Payment basis | Fixed payment over a fixed term | Percentage of discretionary income | Fixed or variable payment, new rate/term |
| Typical term | 10 years | 20–25 years, or until forgiveness | Chosen at refinance, often 5–20 years |
| Total interest | Lowest of the three, generally | Can be higher over a longer term | Depends on new rate vs. original |
| Eligible loans | Federal and private | Federal only | Any (federal loans lose federal status) |
| Modeled by this calculator | Yes (Fixed Term / Fixed Payment) | No — see studentaid.gov Loan Simulator | Yes — enter the quoted new rate and term |
Common questions about student loan calculations
Official US guidance to complement this calculator — not a substitute for advice from your loan servicer
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