What is a debt payoff calculator?
A debt payoff calculator tells you how long it will take to clear your debts and how much interest you'll pay along the way. When you owe money on several accounts at once — credit cards, a car loan, student loans — the order you pay them off changes the math. This tool runs the two proven strategies, the debt snowball and the debt avalanche, and shows you the debt-free date and total interest for each so you can pick the plan that fits you.
How to use this calculator
- Enter each debt — its current balance, interest rate (APR), and the minimum monthly payment. Add a row for every account you owe on.
- Add your extra monthly payment — any amount above the minimums that you can commit to the plan.
- Press Compare to see how many months each method takes and how much interest each one costs.
Example
Say you have an $8,000 credit card at 23%, a $2,500 student loan at 6%, and a $12,000 car loan at 7%, with $515 in total minimums and an extra $100 a month. The snowball clears the small $2,500 student loan first for an early win and finishes in 3 years 11 months, paying $6,203 in interest. The avalanche attacks the 23% credit card first, finishes a month sooner, and pays only $5,578 in interest — saving about $624. Same debts, same budget: the payoff order is the only difference.
Frequently asked questions
What is the debt snowball method?
The snowball pays off your smallest balance first while making minimums on everything else. When the smallest is gone, its payment rolls into the next-smallest. Fast psychological wins, usually slightly more interest than avalanche.
What is the debt avalanche method?
The avalanche pays off the debt with the highest interest rate first. It mathematically minimizes total interest and usually gets you debt-free fastest, though the first win can take longer.
Which is better, snowball or avalanche?
Avalanche saves the most money on paper. Snowball is easier to stick with. If the interest difference is small, the snowball's momentum often wins in real life. This calculator shows both so you can decide.
Does the extra payment really matter?
Enormously. Even an extra $50–100 a month applied consistently can cut years off your timeline and save thousands, because it attacks principal directly.
What if my minimums are less than the interest?
If your total budget doesn't cover the monthly interest, the balance grows. The calculator warns you that the debt can't be paid off at the current payment level.