Debt Payoff Calculator
Calculate how long it will take to pay off your debt and see a monthly payment plan. This calculator uses the standard amortization formula to determine the number of months needed to become debt-free.
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator estimates how many months it will take to pay off a debt given a fixed monthly payment and annual interest rate.
- Enter Total Debt Amount ($) – The total principal you owe (e.g., 10000 for $10,000).
- Enter Annual Interest Rate (%) – The yearly interest rate on the debt (e.g., 5.0 for 5%).
- Enter Monthly Payment ($) – The fixed amount you plan to pay each month (e.g., 200).
- Click "Calculate" – The calculator will show:
- Months to pay off – The number of months required.
- Total interest paid – The cumulative interest over the repayment period.
Important: The monthly payment must be greater than the monthly interest due (otherwise the debt never decreases). All inputs must be positive numbers. Use a decimal point for cents (e.g., 200.50).
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Frequently Asked Questions
It uses the standard amortization formula to calculate the number of months required to pay off a debt given a fixed monthly payment and annual interest rate.
If the monthly payment is less than or equal to the interest accrued each month, the debt will never be paid off. The calculator will show an error message in that case.
The result is rounded up to the nearest whole month. The total interest paid is calculated by simulating each month's payment.
