Loan payoff calculator
See the date your loan clears, what it costs you in interest, and how much an extra payment each month changes both.
Annual rate (APR).
Paying $420/mo
4 years 3 months
Paid off Saturday 18 January · interest $2,700
With $100 extra
3 years 4 months
11 months sooner · $637 less interest
Keep going
This calculator stays free and works without an account. The app adds your real bills, paydays, cards and loans.
What actually decides your payoff date
A loan payment is split every period. Part covers the interest charged on the balance you still owe; whatever is left reduces the principal. Early on, interest takes the larger share, which is why the balance barely seems to move in the first year. As principal falls, the interest charge falls with it, and each payment pushes harder - the loan collapses fastest at the end.
That is also why the payoff date is far more sensitive to your payment size than to your rate. Raising a payment by ten percent frequently shortens the term by more than dropping the rate by a full point, because the extra lands entirely on principal.
The real value of paying extra
Every dollar of extra principal erases all the interest that dollar would have accrued for the remaining life of the loan. On a five-year loan, an extra hundred a month usually removes the better part of a year and a meaningful chunk of interest. Run the numbers above with your own balance to see the exact trade before you commit to it.
Two practical cautions. First, confirm your lender applies extra payments to principal rather than to next month’s installment - the difference is the entire saving. Second, check for prepayment penalties on older fixed-term loans; they are rare but not extinct.
Should this loan be your target at all?
- Higher-rate debt first. A credit card at nineteen percent costs roughly three times what a car loan at six costs per dollar owed.
- Keep a buffer. Overpaying a loan to zero savings usually just moves the next emergency onto a card at a worse rate.
- Watch the cash flow, not just the total. A bigger payment that makes a particular week impossible is not progress.
Fitting the payoff into your actual month
A payoff calculator answers the question in isolation. The harder question is whether the extra payment survives contact with rent, groceries and a card due date. Lastwell places every loan payment on the same day-by-day cash forecast as the rest of your money, so you can test an extra payment and immediately see whether it creates a tight week - and watch the payoff date move as you do it.
Frequently asked questions
- When will my loan be paid off?
- Divide the balance by the part of each payment that actually reduces principal - your payment minus that period's interest. This calculator walks the loan month by month at your real rate, so the payoff date accounts for interest shrinking as the balance falls.
- How much does paying extra actually save?
- Every extra dollar goes straight to principal, which removes all future interest that dollar would have generated. On a mid-rate loan, an extra fifty a month often removes months of payments and hundreds in interest.
- Should I pay extra or build savings first?
- A small cash buffer usually comes first: without one, a surprise expense goes on a credit card at a much higher rate than the loan you were overpaying. Once the buffer exists, attack the highest rate debt.
- Does my lender apply extra payments to principal?
- Most do, but some apply them to future scheduled payments instead, which does not save interest. Tell the lender the extra is a principal reduction and confirm it on the next statement.
- Is this the same as an amortization schedule?
- Yes - it is a simplified amortization run: interest is charged on the outstanding balance each period, the remainder reduces principal, and the last payment is only as large as what is left.