Debt Payoff Calculator
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This calculator helps you understand how long it will take to pay off a debt, like a credit card or personal loan, based on your monthly payments. Small extra payments can make a big difference.
How It Works
By entering your total debt, the interest rate, and your monthly payment, we can project the payoff timeline. The key is making sure your payment is higher than the interest that accrues each month.
The Power of Extra Payments
Paying more than the minimum can dramatically shorten your payoff time and save you a significant amount in interest. Try increasing your monthly payment in the calculator to see the impact.
Logic & Formulas
This calculator uses an iterative (month-by-month) approach to determine the payoff schedule, as there isn't a single formula to directly solve for the time. Here's the process for each month:
- Calculate Interest: The interest for the current month is calculated on the remaining balance.
Interest This Month = Balance * (Annual Rate / 100 / 12)
- Update Balance: The interest is added to the balance, and the monthly payment is subtracted.
New Balance = (Balance + Interest This Month) - Monthly Payment
- Repeat: This process repeats, incrementing the month count and tracking the total interest paid, until the balance reaches zero.
The calculator first checks if the monthly payment is high enough to cover the first month's interest. If not, the debt would grow indefinitely, and an error is shown.