Student Loan Calculator

What this calculator estimates

Borrowing for school is a big number with a long shadow, and the part that catches people out is not the amount they borrow, it is how much it grows by the time it is paid off. So this calculator puts three figures in front of you up front: your monthly payment, the total you will pay over the life of the loan, and the total interest stacked on top of what you borrowed.

Give it the loan amount, the interest rate, and how many years you have to pay it back, and it lays out what a steady monthly repayment would look like.

How to use the Student Loan Calculator

• Loan Amount: how much you are borrowing, in dollars.
• Interest Rate: the annual rate as a percentage, like 6.5.
• Loan Term: how many years you will take to repay, often 10 for a standard federal plan.

Press Calculate, and you get your monthly payment, your total payment, and your total interest.

How the Student Loan Calculator works

This uses the standard amortization formula, the same one behind most fixed-rate loan payments. It splits your loan into equal monthly payments, sized so the balance lands exactly at zero on the final month. The formula:

Monthly payment = P × r ÷ (1 - (1 + r)^-n)

where P is the amount you borrow, r is the monthly interest rate (your annual rate divided by 12), and n is the number of monthly payments (your years times 12). Multiply the monthly payment by n to get the total paid, and subtract P to see how much of that was interest.

Early on, more of each payment goes to interest and less to the balance. As the balance shrinks, that slowly flips. The calculator hands you the totals so you can see the full cost at a glance.

A worked example

Say you borrow $30,000 at 6.5% for 10 years.

The monthly rate is 6.5% ÷ 12, which is about 0.5417% (0.005417 as a decimal), and the number of payments is 10 × 12 = 120. Run those through the formula and you get a monthly payment of about $340.64. Over 120 months that comes to roughly $40,877 paid in total, which means about $10,877 of interest on top of the $30,000 you borrowed.

So that 6.5% quietly turns a $30,000 loan into nearly $41,000 paid back. Seeing the interest on its own line is the whole point: it is the price of borrowing, and a longer term or a higher rate pushes it up quickly.

What real student loans do that this does not

Here is where honesty matters, because a tidy monthly payment hides a few things that real student loans actually do. Use this number as a solid estimate, not a promise, and keep these in mind:

• Unsubsidized interest can start before graduation. Federal loans charge simple daily interest, and on unsubsidized loans that meter runs from the day the money is sent, right through school and the grace period. This calculator assumes you begin repaying the full amount with a clean slate, so a real balance can start higher.
• Unpaid interest can capitalize. When a grace period or a forbearance ends, the interest that has piled up can be added to your principal, and then you pay interest on that interest. That pushes the real total above a plain amortization.
• Subsidized loans are kinder. On subsidized federal loans, the government covers the interest while you are in school, which this tool does not model.
• Income-driven plans change the shape entirely. Federal income-driven repayment sets your payment from your income rather than this formula, and stretches the term out.
• Rates and fees vary. Federal loans are fixed-rate and may carry a small origination fee; private loans can be fixed or variable. Federal rates change every year, so check the official source below for the current numbers.

Who this is for

• Students and parents sizing up what a loan will cost before signing for it.
• Anyone comparing options, since changing the rate or the term shows how much each one moves the total.
• Borrowers planning a budget, who want a realistic monthly figure to build around.

Already repaying and want to see how extra payments shorten things? The Student Loan Payoff Calculator is built for that. Weighing whether the degree pays off in the first place? The College Value Calculator looks at that side of it.

Things to keep in mind

• This is an estimate, not financial advice. It is a planning tool. For real decisions about borrowing, repayment, or refinancing, your loan servicer and a qualified advisor can see your full picture.
• Use your real rate and term. Federal rates change yearly and depend on the loan type and the year you borrowed, so enter the rate from your own loan documents.
• For exact federal numbers, go to the source. The official Federal Student Aid Loan Simulator, linked below, models grace periods, plan types, and capitalization that a simple calculator cannot.
• A longer term lowers the monthly payment but raises the total interest. Stretching payments out feels easier each month and costs more in the end. Worth seeing the trade-off before you choose.

Questions people ask

References

1. Federal Student Aid, U.S. Department of Education. Understand how interest is calculated and what fees are associated with your federal student loan. https://studentaid.gov/understand-aid/types/loans/interest-rates
2. Federal Student Aid, U.S. Department of Education. Loan Simulator. https://studentaid.gov/loan-simulator/
3. Consumer Financial Protection Bureau. Paying for college: student loans. https://www.consumerfinance.gov/paying-for-college/