Snowball vs. Avalanche: The Two Most Popular Debt Payoff Strategies
If you're carrying multiple debts — credit cards, personal loans, an auto loan — and you have some extra money to put toward them each month, the question isn't just "how much can I pay," it's "which debt should get that extra money first?" The two most common answers are the debt avalanche and the debt snowball. Both have you keep making minimum payments on everything, then direct every spare dollar toward one target debt until it's gone — then roll that payment into the next one. Where they differ is how you pick the target.
The Debt Avalanche Method
The avalanche method targets the debt with the highest interest rate first, regardless of its balance. Mathematically, this is the optimal approach — every dollar of extra payment is working against the rate that's costing you the most, so over the life of your debts you'll pay the least total interest and become debt-free in the shortest time for a given budget. The tradeoff is that your highest-rate debt isn't always your smallest, so it can take longer to see a debt fully disappear, which some people find less motivating.
The Debt Snowball Method
The snowball method targets the debt with the smallest balance first, regardless of its interest rate. It's not the mathematically optimal choice, but it tends to produce quick wins — you eliminate entire debts faster, which can build momentum and make a multi-year payoff plan feel more achievable. For many people, that motivational boost translates into actually sticking with the plan, which matters more than a theoretically optimal but abandoned strategy.
Which One Should You Use?
If the interest savings between the two methods are small for your specific debts — which often happens when your rates are fairly similar across accounts — the snowball's psychological benefits may make it the better real-world choice. If one of your debts carries a much higher rate than the others (a common case with credit cards next to auto or student loans), the avalanche method's savings can be substantial enough to be worth the slower early wins. Run both above with your actual numbers to see how big the gap is for your situation.
How This Calculator Works
For each method, the calculator simulates your debts month by month: interest accrues on every balance, minimum payments are applied to every debt, and any remaining budget (your extra payment, plus the minimums freed up from debts you've already paid off) goes toward the highest-priority remaining debt — highest rate for avalanche, smallest balance for snowball. The simulation continues until every balance reaches zero, tracking total interest paid and the order debts are eliminated.
A Note on Minimum Payments and Consolidation
This tool assumes your minimum payments stay constant and that you don't take on new debt during the payoff period — both can change your real-world results. If your rates are high enough that minimum payments barely cover interest, consider whether a balance transfer card, personal loan consolidation, or a call to your lender about a lower rate could reduce the total interest in either scenario before you commit to a payoff order.