How the Mortgage Payoff Calculator works
Estimate when your mortgage could be paid off. Adjust the inputs above, then use the calculate button to generate a fresh estimate based on the numbers you entered.
The result is designed to give you a quick planning number, plus a short breakdown of the major figures behind it. You can reset the form at any time and try a different scenario.
When to use this calculator
Use this mortgage payoff calculator when you want to estimate how long it may take to fully repay your mortgage. It is useful for testing your current payment, adding a small extra payment, or seeing whether a faster payoff goal is realistic.
Formula
New balance = balance + monthly interest - payment - extra payment
- Balance is the current mortgage amount still owed.
- Monthly interest is based on the annual rate divided by 12.
- Regular payment and extra payment reduce the balance each month.
Worked example
For a $350,000 mortgage balance at 5%, a $2,200 monthly payment and $200 extra per month, the calculator estimates the payoff timeline and total interest.
Common mistakes
- Adding extra payments without checking your mortgage prepayment rules.
- Using a payment amount that does not cover enough interest and principal.
- Forgetting that rate changes at renewal can affect the payoff timeline.
FAQs
Can extra payments really shorten the mortgage?
Yes. Extra payments reduce principal faster, which can reduce future interest and shorten the payoff time.
Do all mortgages allow extra payments?
No. Check your mortgage terms for annual limits, payment increase options and prepayment penalties.
Does this assume my rate stays the same?
Yes. The estimate uses the rate entered for the full payoff projection.