Debt Payoff Calculator

Debt Payoff Calculator

This calculator determines how long it will take to become debt-free and how much total interest you will pay based on your current balance, interest rate, and monthly payment. It also shows the projected debt-free date and what percentage of your total payments go to interest versus principal.

How Debt Payoff Is Calculated

Each month, the calculator applies Monthly Interest = Balance x (APR / 12), subtracts that from your payment to determine principal reduction, then carries the new balance forward. This iterative process repeats until the balance reaches zero. Your payment must exceed the monthly interest charge, or the balance will never decrease.

Example

Key Factors That Affect Debt Payoff

• Interest rate — at 18% APR on $15,000, monthly interest starts at $225; at 12%, it starts at only $150, saving thousands over the life of the debt
• Payment amount — increasing your payment by $100/month on a $15,000 debt at 18% APR saves roughly $1,700 in interest and shortens payoff by over a year
• Minimum payments — paying only the minimum extends payoff dramatically and maximizes total interest paid
• Extra payments — even small one-time extra payments reduce the principal directly, saving interest on every future month
• Debt balance — the larger the balance, the more interest accrues each month, making early aggressive payments most impactful

Tips

1. Pay as much as possible above the minimum — every extra dollar goes directly to principal and reduces future interest
2. Use the debt avalanche strategy (highest rate first) to minimize total interest across multiple debts
3. Consider consolidating high-interest debts into a lower-rate personal loan to reduce the APR and simplify payments
4. Set a target debt-free date and work backward to find the monthly payment needed to hit that goal