What Your Student Loan Actually Costs Before You Pay It Off
Maya graduates with $37,000 in federal loans at 6.5% interest. The standard plan gives her a payment of about $420 a month for 10 years. She does the easy math in her head: 37 grand, paid off, done. Then she runs the full numbers. Over those 120 payments she'll hand the servicer roughly $13,300 in interest on top of the principal. Her diploma cost $37,000. Borrowing for it cost her another $13,300.
That gap is the part the loan statement never spells out, and it's where every real decision lives. Three levers move it, and this calculator lets you pull each one:
- The interest rate. Federal rates are fixed for the life of the loan. A 4.5% loan and a 7.5% loan with the same balance can differ by thousands over a decade.
- The repayment term. Stretching 10 years into 20 or 25 cuts the monthly bite roughly in half, but it can roughly double what you pay in interest.
- How fast principal comes down. Every dollar of an extra payment in year one stops accruing interest for the entire remaining term. Year-one dollars are worth far more than year-nine dollars.
Here's what your servicer won't volunteer: on a standard schedule, a large slice of your earliest payments goes straight to interest, not the balance you actually want gone. That's not a scam, it's how amortization works, but it's the reason a loan that "should" take 10 years feels stuck at the same balance for the first couple of years. Knowing that number changes how you treat a tax refund or a year-end bonus.
One honest caveat: a calculator can't tell you whether to attack the balance or qualify for forgiveness, because that depends on where you work and what you earn. This calculator provides estimates based on the information you enter. For advice tailored to your situation, consult a qualified professional.