Debt Payoff Calculator
Find out how long it will take to pay off your debt and how much interest you will pay. See how extra payments speed up payoff. Works for credit cards, personal loans, and any debt.
How the Debt Payoff Calculator Works
This calculator simulates your debt repayment month by month. Each month, interest accrues on the remaining balance at your annual rate divided by twelve. Your payment first covers that interest charge, and the remainder reduces the principal. The simulation repeats until the balance reaches zero, giving you an exact payoff timeline and total interest cost. When you add extra payments, the calculator runs a second simulation to show how much time and money you save. Even small extra payments can shave years off your debt because they reduce the principal faster, which means less interest accrues each subsequent month.
Debt Payoff Formula
Monthly Interest = Balance × (Annual Rate / 12)
Principal Payment = Monthly Payment − Monthly Interest
New Balance = Old Balance − Principal Payment
The calculator iterates monthly until the balance reaches zero.
Snowball vs Avalanche Method
When paying off multiple debts, two popular strategies exist. The avalanche method targets the debt with the highest interest rate first while making minimum payments on everything else. This approach minimizes total interest paid and is mathematically optimal. The snowball method, popularized by Dave Ramsey, targets the smallest balance first regardless of interest rate. Once the smallest debt is eliminated, you roll that payment into the next smallest. The snowball method costs slightly more in interest but provides psychological wins that keep people motivated. Choose avalanche if you are disciplined with numbers. Choose snowball if you need early victories to stay on track. Both are far better than making only minimum payments.
Tips to Pay Off Debt Faster
Make extra payments whenever possible — even an additional $50 per month on a $5,000 credit card balance at 20% APR can save over $1,500 in interest and cut the payoff time by more than two years. Consider a balance transfer to a card offering 0% introductory APR, giving you a window where every dollar goes straight to principal. Automate your payments to avoid missed deadlines and late fees. Build a simple budget that prioritizes debt repayment above discretionary spending. Sell unused items, pick up side income, or redirect windfalls like tax refunds directly to your highest-rate balance. The key principle is simple: every extra dollar applied to principal today prevents interest from compounding on that dollar for the remaining life of the loan.