David Chen is a Certified Financial Analyst with over 10 years of experience in mortgage amortization and accelerated payoff strategies.
Use this free how quickly to pay off mortgage calculator to see how extra payments shorten your loan term and slash total interest—no spreadsheets required.
How Quickly to Pay Off Mortgage Calculator
Accelerated Payoff Formula
Original P&I: M = P × [ r(1+r)^n ] / [ (1+r)^n – 1 ]
Payoff Speed: Extra principal reduces term iteratively until balance = 0
Formula Sources: Bankrate | Investopedia
Variables
- P: Original loan amount.
- r: Monthly interest rate (annual rate ÷ 12).
- n: Original amortization in months.
- Extra Monthly: Additional principal paid each month.
Related Calculators
- Bi-Weekly Extra Payment Calculator
- One-Time Lump-Sum Calculator
- Refinance to 15-Year Calculator
- Mortgage Amortization Schedule
What Is a Payoff Speed Calculator?
It simulates month-by-month amortization with extra principal payments, showing exactly how many months or years you shave off your loan and how much interest you save compared to the original schedule.
How to Calculate Payoff Speed (Example)
- Enter the original loan amount (e.g., $400,000).
- Input the interest rate (e.g., 6.0%).
- Set the original term (e.g., 30 years).
- Add the extra you can pay monthly (e.g., $300), then click “Calculate”.
Frequently Asked Questions (FAQ)
Does this include taxes or insurance? No—only principal and interest. Add escrows separately for PITI.
Can I compare bi-weekly vs monthly extra? Yes—divide bi-weekly amount by 2 and enter as monthly equivalent.
Is there a penalty for paying extra? Most modern loans have no prepayment penalty; verify your note.
How accurate is the payoff date? Accurate to the month for fixed-rate loans; variable-rate results may differ.