Student Loan Payoff Calculator
A student loan payoff calculator shows how fast you can become debt-free: enter your balance, interest rate, and payment, then add extra payments, a lump sum, or biweekly payments — it re-runs your full amortization schedule and shows your new payoff date and total interest saved.
Yearly amortization (with extra payments)
| Year | Principal paid | Interest paid | Remaining balance |
|---|
How to use this calculator
- Enter your loan balance — the total you still owe across the loan you're targeting.
- Enter your annual interest rate (find it on your statement or your servicer's site).
- Enter your remaining term in months — 120 is the standard 10-year plan.
- Add any extra monthly payment or one-time lump sum you're considering.
- Watch the green line beat the orange one: that gap is your money back in your pocket.
How extra payments cut interest
Each month, interest is charged on your remaining balance. When an extra payment hits principal, every future month is charged interest on a smaller balance — so the savings compound. That's why $100 extra per month on a typical $37,000 loan at 5.8% saves thousands of dollars and years of payments, far more than $100 in any single month.
Worked example: $37,000 loan payoff date with $100 extra
Take a typical borrower: $37,000 balance, 5.8% rate, 10-year term. The required payment is $407 per month. On the minimum plan you would pay $11,848 in interest and be debt-free in 2036-10. Add just $100 extra per month: debt-free in 2034-05 — 29 months earlier, saving $3,111 in interest. That is the whole game: every dollar of principal you kill early stops charging interest for the rest of the term.
Three payoff strategies, compared
| Strategy | How it works | Best for |
|---|---|---|
| Extra monthly payments | Add a fixed amount on top of your minimum — it goes straight to principal and saves interest from month one. | Steady, automatic progress |
| Lump sum payments | Put a tax refund or bonus directly on the balance for a one-time interest cut. | Windfalls and bonuses |
| Biweekly payments | Pay half your payment every two weeks — 26 half-payments quietly add a 13th full payment each year. | Matching your paycheck cycle |
Want the full comparison? Read debt snowball vs. avalanche when you have multiple loans.
FAQ
How does a student loan payoff calculator work?
It runs a month-by-month amortization schedule from your balance, rate, and payment. Extra payments go straight to principal, reducing future interest and shortening the payoff date.
How much faster will I pay off with extra payments?
Even $100 extra per month typically cuts years off a 10-year student loan. Enter your numbers above for your exact date.
Is extra monthly or a lump sum better?
Both reduce principal. Extra monthly starts saving immediately; lump sums shine when you get a windfall. The calculator compares both directly.
Does paying extra always make sense?
If you're on an income-driven plan or pursuing forgiveness, extra payments may not benefit you. They make the most sense when you plan to repay in full.
This calculator is for educational purposes only and is not financial advice. Figures are estimates based on the inputs you provide; your servicer's official amortization schedule governs your actual loan. Student loan data referenced from studentaid.gov.