Debt calculator
Debt Payoff Calculator
Estimate your payoff timeline and interest saved with an extra payment.
Last reviewed
September 2026
September 2026
Enter your details
Results update privately in your browser.
How we calculate
A transparent estimate you can inspect.
Formula
Standard amortization using the monthly interest rate and total payment.
Privacy
Your values are calculated locally and are not sent to a server by this calculator.
Use with care
Results are for informational purposes, not financial, tax, legal, lending, or investment advice.
Understanding your results
Payoff duration and interest are simulated month by month, including a partial final payment.
Assumptions and limitations
- Assumes a fixed APR and fixed monthly payments.
Common questions
Before you decide
Why might payoff be impossible?
A payment must exceed monthly interest for the balance to decline.
Will my lender match this?
This is an estimate. Fees, payment timing, and rate changes can affect actual payoff.