How to Use
List each debt with its current balance, annual interest rate, and current minimum monthly payment.
Enter any extra monthly amount you can add toward debt repayment beyond the minimums.
Choose a strategy: avalanche (highest interest rate first) or snowball (lowest balance first).
Review the payoff date and total interest under each strategy to see which saves more money.
Adjust the extra payment amount to see how even small increases change your payoff timeline and total interest.
What Is This Tool?
A debt payoff calculator shows how long it will take to eliminate your debts and how much total interest you will pay under different repayment strategies. The two most common methods are: the avalanche method, which targets the highest-interest debt first (mathematically optimal - minimizes total interest paid), and the snowball method, which targets the smallest balance first (psychologically motivating - quick wins build momentum). The true cost of making only minimum payments is often the most important output this calculator reveals. On a $5,000 credit card balance at 22% APR, minimum-only payments can take over 15 years and cost more in interest than the original balance itself.
Why It Matters
The difference between minimum-only payments and adding even $100 extra per month can mean years of debt and thousands of dollars in interest. Many people underestimate how long minimum payments take because the math is buried in small print on statements. Seeing a concrete payoff date and a dollar figure for total interest makes the real cost visible in a way that abstract APR percentages do not. That visibility is often what motivates real action - and the numbers are almost always more urgent than people expect.
Worked example: fixing the payment amount
Take a $5,000 credit card balance at 22% APR. If the minimum is set at about 2% of the balance - roughly $100 at first - and you always pay only that shrinking minimum, payoff stretches past 15 years and total interest ends up larger than the original $5,000. Hold the payment flat at $100 a month instead and the balance clears in about 7.7 years with roughly $4,200 of interest. Raise it to $250 a month and it is gone in a little over 2 years with about $1,200 of interest. The common mistake is paying the minimum plus whatever spare cash happens to be around; an irregular top-up helps far less than a fixed higher payment you schedule and treat like any other bill.