Mortgage Payoff Calculator — Pay Off Your Mortgage Early
Find your new debt-free date and total interest saved with extra monthly payments, yearly lump sums, or a one-time principal payment. See the side-by-side interest comparison chart.
Mortgage Payoff
Results update instantly as you type
Enter Values
Total Interest — Accelerated Schedule
$126,325.86
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Standard Payoff
January 2044
212 payments · 17.7 years
Debt-Free Date
June 2038
145 payments · 12.1 years
Interest Comparison
Remaining Balance Over Time
The Formula
Each extra dollar of principal paid today eliminates one dollar of future principal — plus all the interest that dollar would have accrued for the remainder of the loan term. The savings compound because reducing principal early prevents interest from accumulating on that principal in every subsequent month.
Variable Definitions
Principal & Interest
The portion of your payment that goes to the loan principal and interest — excluding property taxes (T) and homeowners insurance (I) in a full PITI payment. Use only the P&I amount when entering your current monthly payment.
Debt-Free Date
The specific month and year when your final mortgage payment is made and the balance reaches zero. This is a real date, not just a number of months remaining.
Principal, Interest, Taxes, Insurance
The full monthly housing payment including all four components. Only the principal and interest portion is applied to the loan balance; taxes and insurance go into an escrow account.
How to Use This Calculator
- 1
Enter your original mortgage amount and current remaining balance to establish where you started and where you are today.
- 2
Enter your interest rate and current monthly P&I (principal and interest only, not including taxes and insurance).
- 3
Add extra monthly payments, annual lump sums (like a tax refund), or a single one-time payment made today.
- 4
The calculator shows your new debt-free date as a real calendar month and year, total time saved, and total interest saved.
Common Applications
- Calculate how much time and interest you can save by adding extra principal payments to your monthly mortgage.
- Compare the impact of a one-time lump-sum payment versus recurring extra monthly payments on your payoff timeline.
- Determine the exact month and year you will become mortgage-free under different accelerated payment strategies.
In the early years of a mortgage, most of your payment goes to interest — extra principal payments reduce total interest by years and thousands of dollars
Understanding the Concept
The early years of a mortgage are heavily front-loaded with interest — in year 1 of a 30-year mortgage at 6.75%, over 80% of each payment may go to interest and less than 20% to principal. This is because the interest is calculated on the full outstanding balance, which is largest at the beginning. Extra principal payments are uniquely powerful because they permanently eliminate future interest charges on that principal for the entire remaining term. A $300/month extra payment on a $350,000 mortgage at 6.75% can save you over $100,000 in interest and cut nearly 9 years off your loan. The calculator simulates this month by month: every extra dollar you pay today potentially saves multiple dollars in future interest.
Frequently Asked Questions
Sources & References
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