$10,000 at 12% with $400.00/mo
- Total interest
- $1,564.88
- Total paid
- $11,564.88
- Base monthly payment
- $300.00
- Extra monthly payment
- $100.00
Real balances can change with fees, payment timing, minimum-payment rules, collections, or new charges.
Debt Payoff Calculator
Use this free debt payoff calculator to estimate payoff months, total interest, total paid, and final payment from debt balance, interest rate, monthly payment, and extra payment.
Formula steps Estimate limits shown Examples included Private history
Formula steps
- Convert the annual interest rate to a monthly rate.
- Add monthly interest to the remaining balance.
- Subtract the base payment plus any extra monthly amount.
- Repeat until the balance reaches zero, then add up interest and total paid.
How to use the debt payoff calculator
- Enter the requested dollar amounts, rates, terms, tax settings, or contribution details.
- Use rates as percentages, such as 6.5 for 6.5%, and check whether a field asks for a monthly or annual amount.
- Press the calculate button to see the answer, supporting metrics, and formula steps.
- Use the result as a planning estimate only, then copy it if the assumptions look right.
Common uses
Estimate how long a debt balance may take to repay.
Compare payoff speed with and without an extra payment.
Estimate total interest before choosing a repayment plan.
Check whether a monthly payment is high enough to reduce principal.
Examples
Payoff months and interest
Baseline payoff time
Shorter payoff estimate
Frequently asked questions
Plain-language answers about when to use the estimate, what your numbers mean, what is left out, and how privacy works.
When should I use the Debt Payoff Calculator?
Use it for early planning and side-by-side comparisons, especially for tasks like these: Estimate how long a debt balance may take to repay. Compare payoff speed with and without an extra payment. Treat the answer as a planning estimate, not a final quote.
What is the Debt Payoff Calculator doing with my numbers?
In plain language: The calculator adds monthly interest to the balance, subtracts the monthly payment plus extra payment, and repeats until the balance reaches zero. If the result seems too high or too low, first check whether each field expects a monthly amount, annual amount, dollar value, or percent.
What does this estimate leave out?
This is a fixed-rate payoff model. It does not include fees, penalties, settlement terms, collection rules, creditor agreements, changing rates, or legal advice. Real finance decisions can also depend on fees, timing, local rules, credit details, and provider-specific terms.
Does the site save my finance inputs?
No. The calculator runs in your browser tab. Recent answers stay only on the page while you use it, and they are not sent to a server.