Mortgage Payoff Calculator

A mortgage payoff calculator helps homeowners see exactly how much interest they could save — and how many years sooner they could own their home outright — by making extra payments each month. Enter your current loan balance, interest rate, remaining term, and any extra monthly amount, and the calculator shows your updated payoff date alongside a clear breakdown of total interest saved.

Even modest extra payments make a meaningful difference. On a typical 30-year mortgage, consistently directing an extra $100 to $200 toward your principal each month can shave several years off your loan term and save tens of thousands of dollars in interest over the life of the loan. The savings compound over time: every extra dollar reduces the balance on which interest is calculated, accelerating your payoff with each passing month.

How to Use This Calculator

Using the mortgage payoff calculator is straightforward. Start by entering your current loan balance — the amount you still owe, not the original purchase price. Next, add your annual interest rate and the number of years (or months) remaining on your loan. Finally, enter how much extra you plan to pay each month beyond your required payment. The calculator shows your updated payoff date, the number of months you will save, and the total interest you will avoid paying. You can adjust the extra payment amount at any time to compare different scenarios and find a contribution level that fits your budget.

How Extra Payments Reduce Your Mortgage

When you make your regular mortgage payment, part of that payment covers the interest charged for the month, and the remainder reduces your principal balance. The key insight is that next month's interest charge is calculated on your new, lower balance. By adding extra money to each payment, you reduce the principal faster, which shrinks the interest portion of every future payment — creating a compounding benefit that grows throughout the remaining life of your loan. In the early years of a mortgage, the majority of each payment goes toward interest, so extra payments applied to principal during this period tend to produce the largest savings.

Example: $200 Extra Per Month

Consider a $300,000 mortgage at 6.5% interest with 30 years remaining. The standard monthly payment works out to approximately $1,896. Adding just $200 per month — bringing your total to $2,096 — typically trims more than five years from the loan term and saves roughly $50,000 to $60,000 in total interest, based on standard amortization math. The exact savings depend on your specific loan details and when you begin making the extra payments, so entering your own numbers in the calculator above gives the most accurate picture for your situation.

Explore More Mortgage Tools

• Mortgage Payoff Calculator with Extra Payments — model monthly, annual, and lump-sum extra payments side by side
• How to Pay Off Your Mortgage Early — practical strategies from biweekly payments to refinancing
• Is Paying Off Your Mortgage Early Worth It? — a balanced look at the interest-savings vs. investment trade-off

Frequently Asked Questions

Does paying extra on a mortgage reduce the monthly payment?

In most cases, no. Making extra principal payments does not lower your required monthly payment — it shortens the overall loan term instead. Your required payment stays the same, but you pay the loan off sooner and pay less total interest. Some lenders allow you to formally recast (reamortize) the loan after a large lump-sum payment, which does lower the required monthly payment, but this typically involves a fee and a formal request.

How do I make sure extra payments go toward principal?

When submitting extra payments, indicate clearly that the additional amount should be applied to principal only. Many lenders allow you to specify this in your online payment portal; if not, include a written note with mailed payments or call your servicer. Without this designation, some servicers may apply extra funds toward future scheduled payments rather than reducing your principal balance immediately.

Are there prepayment penalties I should know about?

Most conventional mortgages originated in recent years do not carry prepayment penalties. However, some loan types — particularly certain adjustable-rate mortgages and portfolio loans — may include a prepayment penalty clause. Check your loan documents or contact your servicer before making large extra payments to confirm whether a penalty applies and, if so, how it is calculated.