How to Calculate Mortgage Payoff Calculator
What is Mortgage Payoff Calculator?
A mortgage payoff calculator shows how making extra principal payments accelerates payoff and reduces total interest paid. Because mortgage interest is front-loaded (amortized), even small extra payments in the early years save disproportionately large amounts of interest.
Step-by-Step Guide
- 1Standard amortization: each payment covers interest first, then principal
- 2Extra payments go entirely to principal, reducing future interest
- 3Interest saved = (Standard total paid) − (With extra payments total)
- 4Months saved = Standard term − Actual payoff month with extra payments
Worked Examples
Input
$300,000 loan, 7%, 30yr, +$200/month extra
Result
5 years faster, ~$70,000 interest saved
Extra $200/month makes a large difference
Input
$250,000 loan, 6.5%, 30yr, +$500/month extra
Result
~9 years faster, ~$100,000 saved