Mortgage Payoff Calculator
Plan extra principal payments and compare your original mortgage timeline with a faster payoff scenario.
Extra principal plan
Add monthly, yearly, or one-time principal payments. Use number of payments for a limited run, or leave it blank for ongoing recurring payments.
Result
You could pay off your mortgage 7 years, 1 months earlier and save $132,102.96 in interest.
Payoff timeline
Before
December 2053
After
November 2046
Interest comparison
New payoff date
November 2046
Years/months saved
7 years, 1 months
Interest saved
$132,102.96
Original payoff date
December 2053
Updated payoff date
November 2046
Original total interest
$510,177.95
Updated total interest
$378,074.99
Total extra payments made
$84,300.00
Learn the calculation
What this calculator does
The Mortgage Payoff Calculator estimates how additional principal payments change your payoff month, interest cost, and total time in debt. It is designed for real-world “what if I add $100 a month?” planning.
When to use it
Use it when you are deciding whether to make recurring extra payments, apply a bonus or tax refund to principal, or compare the emotional value of an earlier payoff against other savings goals.
How it works
DynoCalc builds a month-by-month amortization schedule from the original loan amount, rate, term, and start date, then applies extra payments directly to principal in the months you choose. Interest is recalculated each month on the remaining balance.
Example scenario
If a homeowner adds an extra $250 per month beginning this year, the calculator compares the original payoff date with the accelerated payoff date and estimates the interest avoided.
Common mistakes
- Using the original loan balance when your current balance is much lower.
- Entering extra payments as regular payment increases instead of principal-only payments.
- Ignoring whether your lender applies extra money to principal automatically.
FAQs
Do extra mortgage payments reduce principal or interest?+
Extra payments should be applied to principal. Reducing principal lowers future interest because less balance remains for the lender to charge interest on.
Why does the start date matter?+
The start date tells the calculator how far into the loan you are and how much interest has already accrued in the original schedule.
Can I model several future extra payments?+
Yes. Use recurring and one-time extra payment rows to model monthly increases, yearly payments, or lump sums.
Last updated: 2026-05-24
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