Student Loan Calculator

A student loan for over years at interest costs $40,676.07 with payments of $338.97 per month.

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What will your student loans cost you?

A student loan pays for college or graduate school, and you repay it after you leave. Enter what you borrow, the rate, the years left in school and the repayment term above. The example borrows $30,000 at 6.39%, the 2025-26 rate on federal undergraduate loans, with 4 years of school and a 6-month grace period ahead. As an unsubsidized loan borrowed at the start, it grows to $38,627 before your first payment, which comes to $436 a month over 10 years. Subsidized, it stays at $30,000, and the payment is $339.

Federal loans come from the US Department of Education. Direct Subsidized Loans, for undergraduates with financial need, don't charge you interest while you're in school at least half-time. Direct Unsubsidized Loans build up interest from the first day. Parent PLUS loans let parents borrow, usually at higher rates. Federal loan rates are set each year by law and stay fixed for each loan's life. Rules for new borrowers changed in 2026, so check studentaid.gov for current limits and plans.

Private loans come from banks and other lenders, and they base your rate on your credit or a co-signer's. They can have fixed or variable rates, and they generally don't come with federal benefits such as income-driven repayment, forgiveness programs or generous deferment. That's why many counselors suggest using federal loans first. Refinancing federal loans into a private loan permanently gives up those protections.

If you have several loans with different rates, enter each one separately, then add up the payments. To cut your total cost, pay interest while you're still in school if you can, enroll in autopay for a possible rate discount, and direct any extra payment at your highest-rate loan. If the payment doesn't fit your income, contact your servicer early. Default has serious consequences, and federal plans may offer a lower payment.

The term changes the total far more than the payment. Over 10 years, the example costs $22,372 in interest, counting what builds up in school. Stretch it to 20 years and the payment falls to $285, but interest rises to $38,518. At 25 years, it's $258 a month and $47,448. Extra payments go straight to principal on federal loans once any unpaid interest is covered, so even small ones shorten the loan.

Student loan payments on $30,000

Rate5 years10 years15 years20 years
4%$552 a month, $3,150 interest$304 a month, $6,448 interest$222 a month, $9,943 interest$182 a month, $13,631 interest
5%$566 a month, $3,968 interest$318 a month, $8,184 interest$237 a month, $12,703 interest$198 a month, $17,517 interest
6%$580 a month, $4,799 interest$333 a month, $9,967 interest$253 a month, $15,568 interest$215 a month, $21,583 interest
7%$594 a month, $5,642 interest$348 a month, $11,799 interest$270 a month, $18,537 interest$233 a month, $25,822 interest
8%$608 a month, $6,498 interest$364 a month, $13,678 interest$287 a month, $21,605 interest$251 a month, $30,224 interest

Frequently Asked Questions

How do student loans work?

You apply through the FAFSA for federal loans, or directly with a lender for private ones. The money goes to your school first, and any remainder comes to you for other education costs. Repayment usually starts after you leave school or drop below half-time, often after a grace period of about six months. A servicer handles your bills and your questions.

How does student loan interest work?

Interest on federal loans is simple daily interest: balance x rate / 365 each day. At 5% on $30,000, that's about $4.11 a day, or about $125 a month. Unpaid interest can sometimes capitalize, meaning that it's added to your principal, and from then on you pay interest on it too. Paying interest during school or a grace period avoids that.

What is a good student loan interest rate?

For federal loans, Congress sets the rates each year, so everyone in a given loan type and year pays the same. There's no shopping around. For private loans and refinancing, a good rate is one lower than your federal alternative, without giving up benefits you might need. Compare APRs with fees. See current federal rates at studentaid.gov.

How much student loan debt is too much?

A common rule of thumb is to keep total debt below your expected first-year salary, so that payments stay manageable on a 10-year plan. If you expect to earn $50,000 and you've borrowed $50,000 at 6%, you'd pay about $555 a month for 10 years. Try different balances above. Fields with lower starting pay may call for borrowing less.

How much can I take out in student loans?

Federal loans have yearly and lifetime limits that depend on your year in school, dependency status and program. These limits changed for many new borrowers in 2026, especially for graduate students and parents. Your school's financial aid office and studentaid.gov have the current limits. Private lenders may allow up to your school's cost of attendance, minus other aid.

How long does it take to pay off student loans?

The federal Standard Plan is 10 years, and other plans can run longer. Many people take more than a decade, particularly with larger balances or graduate debt. Extra payments shorten that. On $30,000 at 5%, paying over 5 years instead of 10 saves about $4,215 in interest, though the payment rises to $566 a month.

How much student loan interest is tax deductible?

You may deduct up to $2,500 of student loan interest a year, whether or not you itemize, if your income is under the limit. The deduction phases out at higher incomes, and it isn't available if you're married filing separately. It applies to qualifying federal and private loans. Your servicer sends Form 1098-E if you paid $600 or more. See the IRS page.

How does student loan forgiveness work?

Federal programs may cancel remaining balances after certain conditions are met. Public Service Loan Forgiveness requires 120 qualifying payments while working full time for a qualifying employer. Income-driven plans may forgive what's left after a long repayment period. Rules have changed repeatedly, so confirm details at studentaid.gov. Don't pay a company for help you can get for free.

What is student loan deferment or forbearance?

Both pause or reduce your payments for a time. In deferment, the government may pay the interest on subsidized loans. In forbearance, interest generally keeps adding up on all types, which can raise your balance. They help in a short-term hardship, but rules have changed, so ask your servicer what's available. An income-driven plan may be better than a long pause.

What is student loan refinancing or consolidation?

Refinancing means taking out a new private loan to pay off your old ones, ideally at a lower rate. Federal borrowers lose access to federal benefits if they refinance. Consolidation combines federal loans into one Direct Consolidation Loan with a weighted-average rate. It simplifies your bills and can open up some plans, but it won't lower your rate.

What happens if I don't pay my student loans?

Late payments can hurt your credit. A federal loan generally defaults after about 270 days of missed payments. After that, the government can garnish wages and take tax refunds, and you may lose access to further aid and to repayment plans. Private lenders may sue or send the debt to collections sooner. Contact your servicer before you miss a payment, as options exist.

Does student loan interest build while I'm in school?

On unsubsidized and private loans, yes. Interest starts on the day the money is paid out, and any you don't pay is usually added to the balance when repayment begins. On $30,000 at 6.39%, 4 years of school and a 6-month grace period add $8,627. Direct Subsidized Loans don't charge you interest during school or the grace period. Switch the loan type above to compare.