Free Mortgage Payoff Calculators That Show Real Numbers
AmortWise gives you three free calculators and four comparison guides covering how mortgage and personal loan payoff actually changes. Every tool runs standard amortization math, requires no registration, and has no hidden charges. Type in your loan details and the numbers update instantly — payoff date, total interest, and what you would save.
Biweekly Mortgage Calculator
See what happens when you pay half your monthly payment every two weeks: your new payoff date, the interest you save, and a year-by-year balance comparison against the standard schedule.
Extra Payment Calculator
See how a fixed extra amount each month or year shortens your loan: the new payoff date versus the original one, months saved, and total interest saved, plus a balance table every 5 years.
Loan Payoff Calculator
Enter the balance, rate, and monthly payment from your statement and the site solves for your payoff date — then shows what a lump sum or an extra monthly amount would do to it, and how much each extra amount saves.
Which Calculator Fits Your Situation
The tools cover different starting points. Picking the right one saves you from entering numbers twice.
- You have a mortgage and want to know what paying more would do: use the Extra Payment Calculator. Enter the home price, down payment, term, rate, and a fixed extra amount per month. The output is the new payoff date, months saved, and total interest saved against the standard schedule.
- You get paid every two weeks and want to align payments to that: use the Biweekly Mortgage Calculator. Paying half the monthly amount every 14 days produces 26 payments a year, which equals 13 monthly payments — one extra per year, which is what the calculator prices out.
- You only know the balance, rate, and payment on your statement: use the Loan Payoff Calculator. It solves backward for the payoff date instead of asking for a term, then prices out a lump sum or extra monthly amounts.
- You have a personal, auto, or student loan: use the Personal Loan Payoff Calculator. Rates are usually higher and balances smaller, so each extra dollar blocks more interest than on a mortgage.
- You have several debts and one monthly budget: use the Debt Payoff Calculator. It shows which debt clears first and what the avalanche order saves against snowball.
What the Math Does, and What It Assumes
Every tool runs the same amortization engine. Interest is charged each month on the balance that remains at that point, at the annual rate divided by twelve. Whatever is left of the payment after that interest reduces the balance. The loan ends when the balance reaches zero. Nothing is estimated and nothing is rounded in your favour.
Two consequences follow, and both are worth understanding before you run a number.
Timing beats size. Interest is charged on the balance every month, so money paid earlier removes interest that has not yet accrued. On the $240,000 default example here, $200 extra per month saves about $96,270 in interest and clears the loan 98 months sooner. The same $8,000 as a single lump sum in month 40 saves far less, because 39 months of interest on that money has already been charged before the lump sum arrives.
Half payments are the efficient version of the same idea. Paying $758.48 every two weeks instead of $1,516.96 once a month produces 26 half payments a year: 13 full monthly payments instead of 12. On the same default loan that shortens the term from 360 months to 290 and cuts total interest from $306,106.77 to $236,301.74. The extra money per month is $126.41, about 8.3% of the payment — the arithmetic of one extra payment a year spread across the calendar.
What the engine assumes: a fixed rate for the whole term, every payment made on time and in full, and every extra dollar reaching principal in the month you pay it. Adjustable rates, missed payments, escrow adjustments, and servicer handling of partial payments all move the real date. If an extra payment lands in a suspense account instead of on principal, the projection is right and the outcome is not — the payment routing guide covers that case.
Where the Numbers Come From
Two numbers on a statement are worth reading before you trust any payoff figure.
Read interest first. A $240,000 balance at 6.5% carries a $1,300.00 first-month interest charge. Your $1,516.96 payment reduces the balance by about $216.96 in month one. That is why the first years of a mortgage move the balance so slowly, and why the same $200 that saves $96,270 over 30 years saves far less if you start in year 20.
Interest is not the same as payment. A 30-year $240,000 loan at 6.5% costs $546,106.77 in total payments, of which $306,106.77 is interest. The payoff date is the month the balance hits zero, not the month the total paid reaches the loan amount.
On the personal loan side the numbers are smaller but the ratio is worse. The $8,000 default at 9% for 60 months costs $1,963.96 in interest on an $8,000 loan. Adding $50 a month clears it in 44 months and cuts that interest to $1,406.91 — $557.05 saved for $2,200 paid early, and every dollar of that $2,200 was principal, not cost.
Why AmortWise?
- Transparent math shown step by step — the same amortization formula banks use, with the numbers explained in plain English.
- No sign-up or email required — enter your loan details and read your results immediately.
- Free forever for core tools — every calculator and every page on this site costs nothing to use.
- Nothing leaves your browser — the arithmetic runs locally, and no loan details are sent anywhere.
Payoff Strategy Guides
- Biweekly vs Extra Payments — the two main prepayment patterns compared on the same loan: payoff months, interest saved, and which cadence fits your paycheck.
- Debt Snowball vs Avalanche — which payoff order clears multiple debts first and how much interest each ordering really costs.
- Recast vs Refinance — a cash-in recast lowers your payment with no new rate, a refinance lowers the rate at a closing cost: which one saves more on the same loan.
- Loan Payoff Calculator — start from the balance and payment on your statement and solve for the exact payoff date, then price out what extra monthly amounts or a lump sum would save.
- Personal Loan Payoff Calculator — built for small high-rate loans: auto, personal, and student loans, where each extra dollar blocks far more interest than on a mortgage.
- Debt Payoff Calculator — list several debts against one monthly budget and see which clears first, total interest, and exactly how much the avalanche order saves over snowball.
- Why Extra Payments Miss Principal — what a servicer may do with a payment that is not a full periodic payment, how to make the money reach principal, and how to verify it did.
FAQ
What do these calculators actually compute?
Each one runs a standard amortization schedule: interest is charged on the remaining balance at the stated rate divided by twelve, and whatever is left of each payment reduces the balance. The output is the payoff date, total interest, and a balance table, plus the difference an extra payment makes against the same loan. All arithmetic runs in your browser.
Why does an extra payment per month save more interest than a lump sum of the same total?
Because interest is charged every month on the balance. Money paid earlier removes interest that has not yet accrued, while a lump sum paid later only removes interest from that month onward. On the $240,000 default here, $200 extra per month saves about $96,270 and clears the loan 98 months sooner; the same $8,000 paid as a lump sum in month 40 saves far less.
Do biweekly payments require a lender's permission?
Not with a do-it-yourself schedule, which is what this calculator models: you pay half the monthly amount every two weeks from your own account. Third-party biweekly services usually charge a setup fee plus a per-payment fee, and they require enrollment. Doing it yourself costs nothing and produces the same 13 payments a year.
What is the difference between the mortgage and personal loan calculators?
The mortgage tools start from a home price, down payment, term, and rate. The personal loan tool starts from the balance, rate, and payment printed on your statement, because personal, auto, and student loans rarely show a clean remaining term. It solves backward for the payoff date instead of asking you for it.
Do these calculators include taxes, insurance, or mortgage insurance?
No. They model principal and interest only. Property tax, homeowners insurance, and mortgage insurance change independently of the loan balance, so including them would make the payoff numbers less accurate. Enter the principal and interest figure from your statement.
How accurate is a payoff date from a calculator?
It is exact given its assumptions: a fixed rate, every payment made on time and in full, and every extra dollar reaching principal immediately. Adjustable rates, missed payments, escrow adjustments, and servicer re-amortization all move the real date. Treat the result as the best case under a fixed rate.
Is any of this financial advice?
No. AmortWise is an independent educational tool. Whether prepaying beats investing, and which debt to clear first, depends on your rate, your budget, and your goals. The calculators show the arithmetic, not the decision.
Sources
The payment-handling rules on the routing guide come from Consumer Financial Protection Bureau consumer guidance and Regulation X (12 CFR Part 1024). The amortization math is the standard fixed-rate schedule lenders use. See the terms of use for how to read these estimates, the about page for what this site is and is not, and the contact page to report a number that looks wrong.