Student Loan Calculator

Say you graduate with a $30,000 balance at a 6.53% fixed rate on the standard 10-year plan. This student loan calculator shows a monthly payment of about $341, a payoff total of roughly $40,932, and about $10,932 in interest over the life of the loan - so interest adds more than a third on top of what you borrowed. Seeing that full cost up front is the whole point: it helps you decide whether to pay extra, refinance, or change your repayment term.

How the monthly payment is calculated

A fixed-rate student loan is amortized with the same formula used for mortgages and auto loans:

where P is your loan balance, r is the monthly interest rate (annual rate ÷ 12), and n is the total number of payments (years × 12). Each payment covers that month's interest first; whatever is left reduces the principal. Early on, most of your payment is interest; over time the balance falls and more of each payment goes to principal - which is why the amortization table is so useful.

The standard 10-year repayment plan

For federal student loans, the Standard Repayment Plan is the default: fixed monthly payments over 10 years (120 payments). It carries the highest monthly payment of the standard options but the lowest total interest, because you pay the balance off fastest. Extended and graduated plans (up to 25-30 years) shrink the monthly payment but pile on interest. Use the term dropdown above to compare 10, 15, 20, 25 and 30 years side by side.

Term length vs. total interest

Lengthening the term is a trade-off: lower monthly payment, higher lifetime cost. The same $30,000 at 6.53% over 20 years drops the payment to roughly $224/month, but total interest more than doubles to around $23,800. If cash flow allows, the shorter term almost always wins on total cost - and paying even a little extra each month accelerates the payoff because the extra goes entirely to principal.

Federal vs. private student loans

Federal loans have fixed rates set annually by Congress, plus borrower protections like income-driven repayment, deferment and potential forgiveness. Private loans use risk-based, credit-dependent pricing and may be fixed or variable, usually with fewer protections. This calculator handles either one - enter your real rate from your servicer or studentaid.gov for an accurate estimate. The math is identical to any other installment debt, so the general-purpose Loan Calculator and the Personal Loan Calculator will return the same payment for the same balance, rate and term.

How to use this calculator

You only need three numbers, all of which appear on your loan statement or in your account at studentaid.gov:

1. Enter your current balance. Use the total amount you owe today, including any interest that has already capitalized - not the original amount you borrowed.
2. Enter your interest rate. Federal loans show a single fixed rate per loan; if you hold several at different rates, start with your largest balance or use a weighted average.
3. Pick a repayment term. Leave it at 10 years to match the federal Standard Plan, or switch to 15, 20, 25 or 30 years to see how a longer term changes the payment.

The calculator instantly returns your monthly payment, the payoff total, the total interest, and a year-by-year amortization schedule. Change any input and every result updates - that makes it easy to test "what if I refinance to a lower rate?" or "what if I add $50 a month?" If you are juggling several debts at once, pair this with the Debt Payoff Calculator to sequence which balance to attack first.

A second worked example

Suppose you finished a graduate program with a $60,000 balance at a 7.5% fixed rate. On the standard 10-year plan, the calculator shows a monthly payment of about $712, a payoff total near $85,465, and roughly $25,465 in interest. Stretch the same loan to a 25-year extended plan and the payment falls to about $443 - easier month to month, but total interest jumps to around $73,000, nearly triple the standard plan. The monthly relief is real, but so is the long-term cost, and seeing both numbers together is how you make an honest trade-off.

Key terms explained

• Principal: the amount you still owe before interest. Each payment that exceeds the month's interest reduces it.
• Capitalization: unpaid interest being added to your principal, so future interest is charged on a larger balance. It commonly happens at the end of a grace period or deferment.
• Subsidized loan: a federal loan where the government pays the interest while you're in school at least half-time, during your grace period and during deferment.
• Unsubsidized loan: a federal loan that accrues interest the entire time, including while you study, so the balance can grow before repayment starts.
• Grace period: typically the first six months after you leave school before payments are due. Interest may still accrue on unsubsidized loans.
• Servicer: the company that bills you and collects payments on behalf of the lender. It's who you contact to apply extra payments to principal.

Who this calculator is for

It's built for anyone weighing a fixed, fully-amortized repayment plan: a new graduate sizing up the standard 10-year payment, a borrower deciding whether a longer term is worth the extra interest, or someone comparing a private refinance offer against their current loan. If you're on or considering an income-driven repayment plan, this tool isn't the right model - those payments are based on your income, not a fixed formula, and you should use the official Loan Simulator at studentaid.gov instead.

Tips to pay less interest

• Keep the shortest term you can afford. The 10-year standard plan costs the least interest of the standard options because you clear the balance fastest.
• Pay even a little extra. Anything above the scheduled payment goes straight to principal, shrinking the balance that interest is charged on and shortening the term.
• Target your highest-rate loan first. When you hold several loans, ask your servicer in writing to apply overpayments to the loan with the highest interest rate (the avalanche method).
• Set up autopay. Federal servicers and many private lenders cut the rate by 0.25% for automatic payments, and it prevents missed-payment fees.
• Refinance only with eyes open. A lower private rate can cut interest, but refinancing federal loans forfeits income-driven repayment, generous deferment and forgiveness options - weigh those protections before you give them up.

Limitations & assumptions

This calculator models a single fixed-rate, fully-amortized loan with equal monthly payments. To keep it accurate and easy to read, it does not account for several real-world factors:

• Interest that accrues or capitalizes during school, the grace period or deferment - enter your post-capitalization balance to compensate.
• Income-driven repayment, graduated and extended plans, which don't use a fixed payment.
• Loan forgiveness programs such as Public Service Loan Forgiveness, which can cancel a remaining balance after qualifying payments.
• Origination fees, which federal loans charge as a small percentage deducted at disbursement.
• Variable interest rates, which can change over the life of a private loan.

For any of those scenarios, treat the result here as a baseline and confirm the specifics with your loan servicer or the official tools at studentaid.gov.

Scenario comparison: same balance, different terms

The clearest way to understand the term-versus-interest trade-off is to hold the balance and rate steady and only change the repayment term. Using a $35,000 balance at a 6.5% fixed rate, here is roughly how the four common term lengths compare:

• 10-year standard: about $397/month, payoff near $47,700, and roughly $12,700 in total interest - the least interest of the four.
• 15-year: about $305/month, payoff near $54,900, and roughly $19,900 in interest - a $92/month break that costs about $7,200 more overall.
• 20-year extended: about $261/month, payoff near $62,700, and roughly $27,700 in interest - more than double the standard plan's interest.
• 25-year extended: about $236/month, payoff near $70,900, and roughly $35,900 in interest - nearly triple the 10-year figure for a $161/month reduction.

Notice the pattern: each step down in monthly payment buys you less and less relief while adding a steadily larger interest bill. Stretching from 10 to 15 years trims $92 a month, but going from 20 to 25 years saves only $25 a month and adds over $8,000 in interest. If your budget allows the standard payment, it is almost always the cheapest path; if it does not, choose the shortest term you can comfortably afford rather than defaulting to the lowest possible payment. You can sanity-check any of these figures by entering the same balance and rate into the general Loan Calculator.

The cost of capitalized interest

For unsubsidized loans, the gap between what you borrowed and what you owe at repayment can be larger than borrowers expect. Suppose you borrow $27,000 across four years of school and the loan accrues interest the whole time. By the time the six-month grace period ends, several thousand dollars of unpaid interest may capitalize - get folded into your principal - leaving a starting balance closer to $31,000. From that point on you pay interest on interest, which is why your servicer's payoff figure is the right number to enter, not the amount on your original promissory note. The lesson for current students: even a small interest payment while in school keeps capitalization from snowballing, and the Compound Interest Calculator illustrates how quickly unpaid interest compounds against you.

Refinancing and consolidation: what changes

Consolidation and refinancing sound similar but do very different things. A federal Direct Consolidation Loan combines several federal loans into one with a single payment and a weighted-average rate (rounded up) - it simplifies billing and can unlock certain plans, but it does not lower your rate. Refinancing, by contrast, replaces your loans with a brand-new private loan at a rate based on your credit; it can genuinely cut interest, but it permanently converts federal debt to private debt and forfeits income-driven repayment, generous deferment, and forgiveness. Before refinancing federal loans, model the new rate and term here to see the interest savings, then weigh that dollar figure against the protections you would give up. For comparing a refinance offer against your current loan, the Refinance Calculator frames the break-even directly.

Budgeting your payment into your take-home pay

A monthly payment only means something next to your income. A common guideline is to keep total debt payments under roughly 36% of gross income, with student loans usually a portion of that. On a $50,000 salary - about $4,167 gross per month - a $397 standard payment is under 10% of gross, comfortably inside the guideline; the same payment on a $30,000 salary eats a much larger share and may argue for a longer term despite the higher interest. Because your payment competes with rent, a car loan, and credit cards, it helps to see the number against your actual take-home pay. Run your gross figure through the Paycheck Calculator or the Salary Calculator to find your monthly net, then check how the loan payment fits alongside your other obligations.

How it compares to related calculators

This page answers "what is my fixed monthly student loan payment and what will it cost in interest?" If your question is slightly different, a sister tool fits better:

• For any non-student installment debt at a fixed rate, use the general-purpose Loan Calculator or the Personal Loan Calculator.
• To put two offers - say your current loan against a refinance quote - side by side, use the Refinance Calculator.
• To attack several debts in the smartest order with the snowball or avalanche method, use the Debt Payoff Calculator.
• To see whether lenders consider your overall borrowing healthy, check your Debt-to-Income ratio.
• To translate your salary into a monthly take-home figure your payment has to fit into, use the Paycheck Calculator.

Sources

• Federal Student Aid (studentaid.gov) - Repayment Plans
• Federal Student Aid - Standard Repayment Plan
• Federal Student Aid - Interest Rates and Fees
• Federal Student Aid - Loan Simulator (income-driven & forgiveness)
• Consumer Financial Protection Bureau (CFPB) - Student Loans