Debt Payoff Calculator (Snowball vs. Avalanche)
Enter each debt's balance, interest rate, and minimum payment along with your extra monthly payment to compare the Snowball method (smallest balance first) and the Avalanche method (highest rate first) for payoff time and total interest.
What Are the Debt Snowball and Avalanche Methods?
When you're carrying multiple debts, the order in which you pay them off affects both how long it takes to become debt-free and how much interest you pay along the way. Two popular strategies address this: the Debt Snowball method, which targets the smallest balance first to build momentum through quick wins, and the Debt Avalanche method, which targets the highest interest rate first to mathematically minimize total interest paid.
This calculator takes your debts (balance, APR, and minimum payment) plus any extra amount you can pay each month, then simulates both strategies to show the payoff timeline, total interest, and total amount paid for each. In both methods, you pay the minimum on every debt while directing all extra payment toward your top-priority debt; once a debt is paid off, its minimum payment rolls into the extra payment pool for the next debt in line.
How to Use
- Enter each debt's balance, APR, and minimum payment Include credit cards, personal loans, auto loans, and any other debt you're actively paying down
- Add more debts if needed Click "Add a debt" to enter additional balances beyond the default two
- Enter your extra monthly payment This is the amount you can comfortably put toward debt beyond your combined minimum payments
- Compare the results Review the payoff time and total interest for both Snowball and Avalanche to decide which approach fits you better
Tips for getting more out of it
- Credit card balances often carry APRs of 15-25%, which is why they tend to be the top priority under the avalanche method. Reviewing your highest-rate debts first is usually a good place to start.
- If the payoff time seems too long, or the calculator can't find a payoff date at all, consider increasing your extra monthly payment or looking into debt consolidation to lower your interest rates.
- When the interest savings between Snowball and Avalanche are small, it's reasonable to prioritize whichever method keeps you most motivated to stick with your plan.
- Naming your debts (e.g., "Visa Card" or "Car Loan") makes it easier to track which balance is which as you review the results.
Common Use Cases
Planning a payoff strategy for multiple debts
If you're juggling credit card balances, a personal loan, and an auto loan, this helps you decide which one to tackle first
Choosing between motivation and total savings
Compare whether the psychological boost of Snowball or the interest savings of Avalanche better fits your situation
Testing how extra payments speed up payoff
Adjust your extra monthly payment amount to see how much sooner you could become debt-free
Glossary
- debt snowball method
- A payoff strategy that targets the debt with the smallest balance first, regardless of interest rate. Paying off smaller debts quickly can build momentum and motivation to keep going.
- debt avalanche method
- A payoff strategy that targets the debt with the highest interest rate first, regardless of balance. This approach mathematically minimizes the total interest paid across all debts.
- APR
- Annual Percentage Rate — the yearly cost of borrowing, expressed as a percentage of the balance. Credit card balances often carry APRs of 15-25%, making them a common priority for the avalanche method.
- extra payment
- Any amount you pay beyond the minimum required payments. Directing this entirely at one debt at a time (rather than splitting it) pays off debts faster than spreading it evenly.
Frequently Asked Questions
Side Note — Where the Names "Snowball" and "Avalanche" Came From
The snowball method takes its name from the way a small snowball grows as you roll it down a hill, picking up more snow and momentum with every turn. Once you pay off a small debt, the minimum payment you were making on it "rolls into" the payment for your next debt, so the amount you can pay down debt with grows larger and larger — just like a snowball.
The avalanche method, by contrast, borrows its imagery from the way avalanches tend to start at the most unstable point on a slope. Applied to debt, that "most unstable point" is the debt with the highest interest rate — the one that grows fastest and costs you the most if left unaddressed — so the avalanche method knocks that one down first.
Both strategies gained wide recognition in the 2000s through personal finance writers and advisors in the United States. The snowball method, in particular, was popularized by a bestselling personal finance book that argued behavioral psychology often matters more than pure math: the emotional win of eliminating a debt entirely, even a small one, can be the difference between sticking with a payoff plan and giving up on it.