Find your loan payoff date, then watch what extra payments do to it. This calculator works for personal loans, auto loans, and any other fixed rate loan, and shows exactly how much interest and time each extra dollar saves. It also computes your per diem interest and a real 10 day payoff amount.
Educational tool, not financial advice. SavingsClub is not a licensed financial advisor.
Extra payments only help if your lender applies them to principal. Check the common mistakes section below before sending your lender extra money.
Enter your loan balance, rate, and monthly payment above, then click Calculate to see your payoff date, what extra payments save you, and your year by year schedule.
Enter three numbers: your current balance, your interest rate, and your monthly payment. The tool runs the loan month by month, charging interest on the remaining balance and applying your payment exactly the way a lender does. That produces your true payoff date and total interest cost, not an approximation. It then runs the loan a second time with your extra monthly payment and any one time lump sum included, and places the two side by side. The gap between those runs is the honest answer to what everyone actually wants to know: what does paying extra really buy me. That answer arrives as months removed from the loan and dollars of interest that never get charged.
It serves as a personal loan payoff calculator, an auto loan payoff calculator, or a tool for any fixed rate installment debt. For credit cards, use our credit card payoff calculator instead, since revolving debt behaves differently. To juggle several debts at once, the debt payoff calculator compares avalanche and snowball strategies across your whole list.
Here is the detail most tools ignore, and the reason your final check to a lender rarely matches your statement balance. Every day, interest accrues on what you still owe. That daily figure is your per diem interest, and it is simple to find: multiply the balance by the annual rate, then divide by 365. Some lenders use a 360 day banker's convention instead, which produces a slightly larger daily number. On a 25,000 dollar balance at 9 percent, the per diem is about 6.16 dollars, the interest you add each day you carry that debt.
This is why a current principal balance vs payoff amount question has two answers. The principal balance is what you owed on the statement date. The payoff is that balance plus the per diem for every day until the lender actually receives your money. When you request a quote, the lender gives a figure good through a specific date, commonly a 10 day payoff amount, so a mailed or wired payment still covers the interest piling up in transit. Ask "what is 10 day payoff" and that is the mechanic behind the reply. The small tool below is a quick loan per diem calculator that also returns a 10 day and a 14 day payoff date figure.
A quick per diem interest calculator. Enter a balance and rate to see the daily interest, plus what you would owe if the payoff lands in 10 or 14 days.
This assumes simple daily interest and a payoff quote with no lender fees. Your actual quote may add a small statutory or processing charge, so treat this as a close estimate and confirm the official figure with your lender.
Every dollar of an extra payment goes to principal when applied correctly, and shrinking the principal does two things at once. It directly reduces what you owe, and it reduces the balance that next month's interest is calculated on. That second effect compounds in your favor for the rest of the loan. The numbers beat intuition. On a 25,000 dollar loan at 9 percent with a 500 dollar monthly payment, you would clear the debt in about 63 months with roughly 6,400 dollars of total interest. Add just 100 dollars a month and it is gone about a year sooner, with around 1,400 dollars less interest. Add 250 dollars and you cut nearly two years. A lump sum works the same way, and timing matters enormously: a 2,000 dollar payment in month one erases far more interest than the same amount in year three, because it spends more months reducing the balance that interest feeds on.
You will see this promoted as a magic loan hack. Here is what it actually is. Paying half your monthly amount every two weeks produces 26 half payments a year, which equals 13 full payments rather than 12. It is simply one additional payment annually, automated. The convenience is real, since no willpower or monthly decision is required, but you can reach the identical result by making one extra principal payment yourself each year. If a lender or third party charges setup or per payment fees for a biweekly program, skip it and do the arithmetic by hand. Never pay a fee for something you can do free.
This is the real decision behind every early payoff plan, and the honest answer turns on your rate. Overpaying a loan is a guaranteed return equal to its interest rate. Retiring a 9 percent balance is a locked 9 percent, which beats what most diversified portfolios can promise. Retiring a 3 percent balance while skipping investments that have historically averaged 6 to 7 percent after inflation usually leaves money on the table over long horizons. The rough framework many educators use: high rate debt above roughly 7 to 8 percent is worth attacking hard, low rate debt below about 4 to 5 percent is usually worth paying on schedule while you invest the difference, and the middle is a judgment call where guaranteed savings, risk tolerance, and the value you place on being debt free all weigh in. Clearing a payment also lowers your risk if income drops, something no spreadsheet captures. Compare the investing side with our investment calculator and decide with real figures on both sides. One rule almost everyone agrees on: build a basic emergency fund before making large extra payments, because overpayments are usually irreversible and you cannot ask a lender to refund them when the transmission dies.
The expensive one is failing to direct extra money to principal. Many lenders apply a surplus to your next scheduled installment by default, which prepays interest rather than shrinking your balance. When you overpay, choose apply to principal in the app or say those exact words on the phone, then verify on the following statement that the balance dropped by the full extra amount. Watch for prepayment penalties too. Most personal and auto loans today carry none, but some do, especially older agreements and certain subprime auto loans. Scan your contract for the words prepayment penalty or precomputed interest before writing a large check, since a precomputed loan calculates interest up front and makes early payoff far less valuable. Order also matters: paying extra on a 6 percent loan while carrying a 24 percent credit card is backward, so send spare dollars to the most expensive debt first. Finally, do not drain every cent into the loan while holding zero savings. Keep the emergency fund funded, capture any 401k employer match first for an instant 50 to 100 percent return, then attack the balance with what remains.
Enter your current balance, interest rate, and monthly payment above, then add the extra amount you can pay each month or as a one time lump sum. The tool runs your loan month by month and shows the new payoff date, the months you save, and the interest you avoid compared with your current plan.
Not always, and this mistake costs people real money. Some lenders apply extra money to your next scheduled installment, interest included, instead of reducing principal. When you send more, mark it as principal only in the app or say the words apply to principal on the phone, then confirm the next statement shows your balance dropping by the full amount.
It depends on your balance and rate, but the effect is bigger than most people expect. On a 25,000 dollar loan at 9 percent with a 500 dollar payment, adding 100 dollars a month clears the debt roughly a year sooner and saves about 1,400 dollars in interest. Run your own figures above to see the exact impact.
Per diem interest is the amount your loan accrues each single day, found by multiplying the balance by the annual rate and dividing by 365, or 360 under a banker's convention. On a 25,000 dollar balance at 9 percent, that is about 6.16 dollars a day. Knowing this daily figure lets you work out an exact payoff amount for any future date.
A 10 day payoff amount is your current principal plus ten days of per diem interest, the figure a lender quotes so a mailed or wired payment still covers the interest accruing while it is in transit. It is why your payoff is slightly higher than the balance on your statement. The per diem tool above calculates a 10 day and 14 day payoff date figure for you.
Because a principal balance and a payoff amount are two different numbers. The balance is what you owed as of the statement date, while the payoff adds the interest that has accrued each day since, the per diem, up to the day the lender receives your money. On most loans the gap is small, but it grows the longer the payoff quote sits unpaid.
They are almost the same thing in disguise. Paying half your monthly figure every two weeks produces 26 half payments a year, which equals 13 full payments instead of 12. The advantage is psychological, since the additional payment happens automatically. If your lender charges a fee to run a biweekly program, skip it and make one extra principal payment yourself each year.
Compare your rate to what you could reasonably earn elsewhere. Retiring a 9 percent loan is a guaranteed 9 percent return, which beats most realistic market expectations, while overpaying a 3 percent loan and skipping investments that might earn 6 to 7 percent usually costs you over time. Weigh the non math factors too, since a cleared loan frees monthly cash flow and lowers risk if your income drops.
It can cause a small temporary dip, since closing an installment account can reduce your credit mix and lower the average age of your accounts. For most people the dip is minor and recovers within months, and the interest savings are worth far more than a few points. Never keep a loan open purely to feed your score.