Punch in your loan amount, interest rate, and term above and the calculator shows your monthly payment, total interest, and a full year-by-year payoff schedule. Add an extra monthly payment and it recalculates both numbers side by side, so you can see exactly what an extra $50 or $200 a month is actually worth before you commit to it. The rest of this page fills in the context the raw numbers don’t show: how federal and private loans differ, what repayment plans exist, where this calculator’s math applies cleanly and where it doesn’t, and what levers actually move the needle on payoff time.
Federal vs. private student loans
The loan amount and rate you type into the calculator behave very differently depending on whether the loan is federal or private, and that difference matters more once you start making repayment decisions.
Federal Direct Loans are issued by the U.S. Department of Education and come in a few flavors: Direct Subsidized (undergraduate, need-based, government pays interest while you’re in school), Direct Unsubsidized (available to undergrad and grad students, interest accrues from day one), and Direct PLUS (parents or grad students, credit-based). Every federal loan has a fixed rate set once a year and locked in for the life of that specific loan — your rate doesn’t change even if market rates move later. For loans first disbursed between July 1, 2026 and June 30, 2027, the rates are roughly 6.52% for undergraduate Direct Subsidized/Unsubsidized loans, 8.07% for graduate Direct Unsubsidized loans, and around 9.07%–9.08% for PLUS loans. These rates reset every year based on the 10-year Treasury auction, so a loan you take out next year will carry a different rate than one from this year — the Federal Student Aid office publishes the exact current numbers each spring, so confirm the rate for your specific disbursement year before you borrow. Federal loans also carry an origination fee taken off the top before you receive the money — currently about 1.057% for Subsidized/Unsubsidized loans and 4.228% for PLUS loans — which this calculator doesn’t subtract out (more on that below).
Private student loans come from banks, credit unions, and online lenders. Rates can be fixed or variable, are based on your (or a cosigner’s) credit, and vary widely — a strong-credit borrower might land well below federal grad rates, while a thin-file borrower without a cosigner could pay considerably more. Variable-rate private loans can also change month to month or year to year as the underlying index moves, which this calculator’s single fixed-rate field doesn’t capture — if your private loan is variable, treat the calculator’s output as a snapshot based on today’s rate, not a guarantee.
The bigger difference isn’t the rate — it’s what happens when things go wrong. Federal loans come with a set of borrower protections built into law:
- Deferment — a pause on payments (and, for subsidized loans, on interest too) for qualifying situations like being back in school, unemployment, or economic hardship, for up to three years.
- Forbearance — a shorter-term pause, usually up to 12 months at a time with a lifetime cap, where interest keeps accruing on all loan types, including subsidized ones.
- Income-driven repayment — the option to tie your payment to your income rather than a fixed schedule (covered in detail below).
- Discharge programs — including death and total-and-permanent-disability discharge, and closed-school discharge, that are written into federal law.
Private lenders aren’t required to offer any of this. Some offer short-term hardship forbearance voluntarily, but the terms are set by the lender’s contract, not federal statute, and interest almost always keeps accruing during any pause. If you lose your job or hit a medical emergency, a federal loan gives you a legal fallback; a private loan gives you whatever your servicer is willing to work out. Keep this in mind if you’re ever weighing whether to refinance federal debt into a private loan for a lower rate — you’d be trading away these protections, not just changing a number.
Repayment plan options (federal)
Private loans generally have one repayment structure: pay the fixed schedule your promissory note lays out, possibly with the option to refinance later. Federal loans have several official plans, and the plan you’re on changes both your monthly payment and, in some cases, how the loan can eventually be forgiven.
Standard Repayment Plan
Fixed payments over a set term so the loan is paid off completely. This is the plan this calculator models directly: enter the loan amount, rate, and term, and the output is essentially a Standard Plan projection.
Tiered Standard Plan
New as of July 1, 2026, this replaces the old flat 10-year Standard Plan for new borrowers going forward. Instead of everyone getting a 10-year term, the repayment period scales with how much you borrowed: roughly 10 years for balances under $25,000, 15 years for $25,000–$49,999, 20 years for $50,000–$99,999, and 25 years for $100,000 or more. Structurally it’s still fixed payments over a fixed term, so it maps onto this calculator cleanly too — just plug in the term that matches your balance tier.
Extended and graduated plans
Extended plans stretch payments over up to 25 years to lower the monthly amount (at the cost of more total interest). Graduated plans start low and increase every two years, on the theory that your income will rise over time. Both are still fixed, predictable schedules and can be approximated in this calculator by entering the applicable term.
Income-driven repayment (IDR)
IDR plans set your payment as a percentage of your income and family size rather than a fixed dollar amount tied to your balance. Historically this included plans like IBR, PAYE, ICR, and SAVE. That landscape changed significantly in 2026: a court order ended the SAVE Plan, and the Department of Education is moving affected borrowers off it. Starting July 1, 2026, two plans are central going forward — RAP (Repayment Assistance Plan), a new IDR option where payments run roughly 1%–10% of adjusted gross income depending on earnings, reduced by about $50/month per dependent, with a $10 minimum payment and forgiveness of any remaining balance after 30 years of qualifying payments — and the Tiered Standard Plan described above. PAYE and ICR are closing to new enrollees on July 1, 2026 and are set to sunset by 2028; IBR remains open on a more permanent basis for loans disbursed before July 1, 2026.
This area of federal policy has moved fast and could keep changing. Don’t treat plan names, percentages, or eligibility rules above as locked in — confirm current details with your loan servicer before choosing or switching plans, and use the income-driven repayment estimator on this site for a ballpark income-based payment to compare against the fixed-schedule numbers here.
How this calculator’s numbers map to real repayment
This calculator runs one specific model: a fixed principal, a fixed annual rate, a fixed term, and equal monthly payments (plus any extra you add), amortized the standard way — same math a mortgage or auto loan calculator uses. That model is accurate for:
- Private loans with a fixed rate, which are literally structured this way.
- Federal loans on the Standard or Tiered Standard plan, since those are also fixed-payment, fixed-term schedules.
- “What if I refinance or pay extra” scenarios on any fixed-rate loan, federal or private.
It does not model, and isn’t trying to model:
- Income-driven payments. If you’re on RAP, IBR, or a similar plan, your real monthly payment is a function of your income and family size, not a fixed amortization formula — it can go up, down, or stay flat for years regardless of your balance. This calculator can’t reproduce that; use it to see what a Standard-Plan payment would look like for comparison, not to estimate an actual IDR payment.
- PSLF or IDR forgiveness. Public Service Loan Forgiveness and the 20-to-30-year IDR forgiveness timelines mean some borrowers never pay off the full amortized total this calculator projects. The tool has no concept of forgiveness — it always assumes you pay the loan off in full.
- Interest capitalization during school or during deferment. Direct Unsubsidized and PLUS loans accrue interest while you’re in school (and often during any deferment or forbearance period). If that unpaid interest capitalizes — gets added to your principal balance — before repayment starts, your real starting balance will be higher than the sticker amount you borrowed. Enter the actual balance you’ll owe at the start of repayment, not the original amount borrowed, if capitalization has already happened.
- Origination fees. Federal loans deduct an origination fee from the disbursement before the money reaches you, but you still owe the full face value. That fee effectively raises your true borrowing cost slightly above what the interest rate alone suggests — this calculator’s total-interest figure doesn’t include it.
- Servicer rounding and payment timing quirks. Real servicers round to the cent, apply payments on specific dates, and sometimes handle extra payments differently (some require you to actively mark an extra payment as “apply to principal” instead of applying it to next month’s due date, which can quietly change how much of it actually reduces future interest).
None of this makes the calculator wrong — it’s doing the standard fixed-rate amortization math correctly. It just means the further your real loan gets from “fixed rate, fixed term, no income-based adjustments,” the more the calculator’s output should be read as a useful reference point rather than a bill.
Strategies to pay off faster
Beyond simply typing a number into the extra-payment field and watching the payoff date move, a few concrete tactics are worth knowing.
Biweekly payments
Paying half your monthly payment every two weeks instead of the full amount once a month results in 26 half-payments a year — the equivalent of 13 full monthly payments instead of 12. That extra payment goes straight to principal, functioning like a modest, automatic version of the extra-payment field in this calculator. To model it here, divide your annual “13th payment” by 12 and add that as your monthly extra amount. Confirm with your servicer that biweekly payments are actually applied as received and not just held until the full monthly amount accumulates — practices vary.
Refinancing
Refinancing means taking out a new private loan to pay off one or more existing loans, ideally at a lower rate. It can meaningfully cut total interest on private loans or on federal loans you’re confident you’ll never need income-driven repayment or forgiveness options for. The catch: refinancing federal loans into a private loan permanently converts them into private debt. You lose access to IDR, deferment, forbearance, and federal discharge programs — there’s no way to convert back. Model both scenarios in this calculator (current rate/term vs. the refinance offer’s rate/term) before deciding, and weigh the dollar savings against the protections you’d be giving up.
Employer student loan repayment benefits
A growing number of employers offer direct contributions toward employee student loans, often a set dollar amount per month or year, sometimes with favorable tax treatment. If your employer offers this, it’s effectively a permanent extra payment — enter that monthly amount into the extra-payment field to see its long-run effect on your specific loan.
Avoiding capitalized interest
If you have unsubsidized or PLUS loans still accruing interest during school, paying even just the interest portion each month (instead of letting it capitalize when repayment starts) keeps your principal from growing before you’ve made a single “real” payment. This is one of the highest-leverage moves available to current students, since it prevents your future starting balance — and every future interest calculation — from being inflated.
Highest-rate-first, in general
When you’re juggling multiple loans, directing extra payments at the highest-rate loan first (while making minimum payments on the rest) minimizes total interest paid across all of them — this is the “debt avalanche” approach. It’s a purely mathematical strategy; some people prefer paying off the smallest balance first for the psychological win of eliminating a loan entirely (the “debt snowball”). Either works — the avalanche method just saves more in total interest.
FAQ
Why is my real payment different from what this calculator shows? The most common reasons: your actual loan started with a higher balance than expected because of capitalized interest, your rate is variable and has moved since you last checked, an origination fee was deducted from your disbursement, or you’re on an income-driven plan where the payment isn’t calculated from the balance at all.
Does this calculator account for loan fees like origination fees? No. It calculates interest and payments purely from the loan amount, rate, and term you enter. If you want to account for an origination fee, you can approximate its effect by entering your actual disbursed balance (loan amount minus the fee) rather than the amount stated on your promissory note, though the fee itself is a separate, one-time cost outside the interest math.
What extra payment amount actually makes a difference? Even small amounts help, but the earlier in the loan you add them, the more they save, since they cut principal (and therefore future interest) while the balance is largest. Try a few different amounts in the extra-payment field and compare the “months saved” and “interest saved” figures — for many loans, $50–$100/month extra makes a visibly larger dent than most borrowers expect.
Should I pay off my highest-rate loan first if I have several? Mathematically, yes — extra payments do the most good against your highest-rate balance. Run each loan through this calculator separately with its own rate and balance to see how much interest each one is actually costing you before deciding where to send extra money.
Does this calculator work for income-driven repayment plans? Not directly. IDR payments are based on income and family size, not a fixed amortization schedule, so this tool can’t reproduce them. Use it to see what a Standard or Tiered Standard payment would look like as a point of comparison, then try the income-driven repayment estimator for a ballpark income-based number, and confirm anything binding with your loan servicer.
Is this financial advice? No. This calculator provides estimates based on standard fixed-rate amortization for planning purposes only. Loan terms, servicer practices, capitalization rules, and federal repayment programs can all affect your actual numbers, and federal repayment plan rules in particular have changed significantly and may change again. Confirm anything you’re relying on with your loan servicer or directly at studentaid.gov before making a repayment decision.