Debt Payoff Calculator
Show the math
What Your Result Means
- Months to payoff: How long it takes to eliminate the debt at your current fixed payment. Even small increases in monthly payment can cut this number dramatically on high-interest debt.
- Total interest: The cumulative interest paid over the entire payoff period. On long payoff timelines, this can approach or exceed the original debt amount.
- Total paid: Principal plus interest — the full cost of carrying this debt to completion. Use this to compare payoff strategies or weigh whether to accelerate payments.
- Payoff date: The estimated calendar month when the last payment is made, based on today's date and the calculated number of months.
How This Calculator Works
You enter the total debt balance, the annual interest rate, and a fixed monthly payment. The tool converts the annual rate to a monthly rate, then simulates each month: it charges interest on the remaining balance and subtracts your payment. It repeats until the balance reaches zero or 600 months (50 years), whichever comes first. If the payment does not exceed the first month's interest, the tool reports "Never." The calculation assumes a fixed rate, no fees, and no additional borrowing.
Quick Questions
Why does it say "Never pays off"?
Your monthly payment is not large enough to cover the monthly interest charge, so the balance grows each month instead of shrinking. Increase your payment above the interest threshold — shown as the first-month interest in the Show the Math section — to begin making progress.
How much faster does an extra $100/month pay off the debt?
It depends on your rate and balance, but the effect is often dramatic. On a $10,000 balance at 20% APR, going from $200 to $300 per month cuts the payoff time roughly in half and saves thousands in interest. Try adjusting the payment field to see the difference live.
Should I use the avalanche or snowball method?
The avalanche method (highest rate first) minimizes total interest. The snowball method (smallest balance first) provides quicker wins for motivation. Both work — the best method is the one you will stick with consistently.
Does this include fees like late charges?
No. This calculator assumes a clean payoff with no late fees, over-limit fees, or annual fees. Real-world payoff may take longer if fees are added to the balance.
Sources
- CFPB — Debt Collection (consumer rights, repayment strategies)
- Federal Reserve G.19 — Consumer Credit (average interest rates on consumer debt)
- National Foundation for Credit Counseling (nonprofit debt counseling resources)
Method & review
Estimate only. Results reflect your inputs and standard formulas — they are not financial, tax, legal, health, or investment advice. Verify important decisions with a qualified professional.