Snowball vs avalanche: same $8,000 debt, who wins?

Same rules for both

Both methods follow the same three rules: pay every minimum, send everything extra to one target debt, and when a debt hits zero, roll its whole payment into the next target. The only difference is the order.

• Snowball: smallest balance first (A → B → C).
• Avalanche: highest APR first (B → C → A).

The first win

The snowball attacks Card A, the $1,500 balance. It's gone in month 21. The avalanche starts with Card B, the 29% card, which takes until month 28. So the snowball gives you your first paid-off card seven months sooner.

That matters more than it sounds. A paid-off card is proof the plan works, and a freed-up minimum makes the next target move faster.

Both methods start by covering every minimum, and paying only the minimum is what keeps balances around for years. A small sinking fund for irregular costs keeps new charges off the cards while you pay them down. Enter your own cards in the debt payoff calculator.

The finish line and the bill

With the avalanche, all three cards are paid off in month 50, with $4,322 in total interest. With the snowball it takes 52 months and $4,789. The avalanche finishes two months sooner and pays $467 less, because the most expensive balance is gone first.

So which one?

Mathematically, the avalanche wins whenever APRs differ. Practically, the method you'll stick with beats the one you abandon. If you need early momentum, start with the snowball. If the gap in interest is large and you're motivated by the number, use the avalanche. You can also start with one quick snowball win, then switch.

Your real cards calculate interest daily and your minimums may change as balances drop, so run your own numbers in the calculator.

How the roll-over works

The extra payment is what makes either method work. In the example the minimums total $200 and the budget is $250, so $50 goes to the target card on top of its minimum. When Card A is paid off with the snowball, its $35 minimum doesn't disappear: it joins the $50, and $85 extra now goes to the next target. Each paid-off card makes the next one faster.

If you stop rolling payments forward and spend the freed-up minimum instead, both methods slow down dramatically. Keeping the monthly total fixed until the last card is gone is the real rule.

Run your own numbers

The example uses tidy numbers: fixed minimums, monthly interest (APR ÷ 12) and no new charges. Real cards calculate interest daily, and many issuers lower the minimum as the balance falls. The ranking rarely changes, but the months and the interest will.

List every debt with its balance, APR and minimum, decide on a monthly total you can sustain, and compare both orders in the calculator. If the avalanche saves only a few dollars, the faster first win of the snowball may be worth more to you. If it saves hundreds, the avalanche is hard to argue with. Either way, write the order down and keep the monthly total fixed until the last balance is gone.