Student Loan Payoff Calculator

How to use this calculator

Enter your current loan balance, the annual interest rate on your loans, and the monthly payment you make today. Then add any extra payment you could put toward the loan each month. The calculator simulates your balance month by month and shows your payoff date, the total interest you’ll pay, and how much sooner you’ll be debt-free by paying a little more. Try the example chips to see common scenarios, and adjust the sliders to match your own loans.

How this is calculated

We run a month-by-month simulation. Each month we add interest equal to your balance times the annual rate divided by twelve, then subtract your payment. We do this twice — once with your base payment and once with your base payment plus any extra — and count the months until each balance reaches zero. Total interest is the sum of every interest charge along the way; total paid is your principal plus that interest; time saved is the difference between the two payoff dates. If your monthly payment doesn’t cover the first month’s interest, the balance can never fall, so we flag that case instead of showing a payoff date.

Educational estimate, not financial advice — see our disclaimer.

A worked example

Say you owe $30,000 at 5.5% and pay $350 a month. The first month’s interest is about $137 ($30,000 × 5.5% ÷ 12), so roughly $213 of that first payment goes to principal. Keeping that up, you’d clear the loan in around 9 years and pay close to $8,000 in interest. Now add just $100 extra a month: every dollar of that goes straight to principal, you finish two-plus years sooner, and you save well over a thousand dollars in interest. That’s the power of attacking the balance early, while the interest charges are largest.

How to pay off student loans faster

• Pay more than the minimum — extra dollars skip the interest line and go straight to principal, which shrinks every future interest charge.
• Target the highest-rate loan first — if you hold several loans, throwing extra at the most expensive one saves the most money (the avalanche method).
• Make biweekly payments — paying half your monthly amount every two weeks sneaks in one extra full payment a year.
• Apply windfalls — tax refunds, bonuses, and raises are painless ways to knock down the balance.
• Avoid stretching the term — lower payments feel nice but usually mean far more interest over the life of the loan.

If you’re juggling multiple debts, our debt avalanche calculator shows how to order them to pay the least interest overall.

Tips before you accelerate payoff

• Keep a starter emergency fund first, so a surprise expense doesn’t push you back onto high-interest credit cards.
• Capture any employer match on retirement accounts before going all-in on extra loan payments — that match is free money.
• Tell your servicer to apply extra payments to principal, not to advance your due date.
• Watch for prepayment terms — most student loans have none, but always confirm there’s no penalty.