One budget, two orders
Both methods spend the same total each month. Both pay every minimum and roll a cleared debt's payment into the next one. The only difference is which debt receives the extra money first: the smallest balance under the snowball, the most expensive balance under the avalanche.
Because the monthly total is identical, any gap in the results comes from one source: how long each balance stays open and what it charges in the meantime. The comparison turns that into a single dollar figure and a month count for your specific debts.
When the gap tends to be tiny
For many sets of debts, the two methods land close together. That tends to happen when:
- The rates are similar. If every debt charges roughly the same rate, it matters little which one is cleared first.
- The smallest balance is also the most expensive. Then both methods choose the same first target, and sometimes the same full order, producing identical results.
- The timeline is short. A large monthly extra clears everything quickly, leaving less time for any rate difference to add up.
- There are only two or three debts. Fewer debts means fewer ways for the orders to diverge.
When the gap tends to grow
The difference widens when the snowball's first targets are cheap and the debt it saves for last is expensive. A common pattern is a few small, low-rate balances alongside one large, high-rate card. The snowball clears the small ones first while the large balance keeps charging its full rate.
Long timelines widen the gap too. When the monthly extra is modest, every month the expensive balance waits adds to the difference. Promo rates that end partway through can also shift the result, since a 0% balance may become the costliest debt later in the plan.
Both sides, stated plainly
Some people prefer the snowball because early payoffs are visible and frequent, and closing accounts can make a long plan feel shorter. For them, a modest interest gap may be a reasonable price for that sense of progress.
Others prefer the avalanche because it is built to keep total interest as low as the simple methods allow, and the dollar figure is what they track. Some use a blend, clearing one tiny balance first and then switching to rate order.
The calculator does not pick a side. It shows the cost of each so the trade-off is concrete. For a ranked list that also includes a custom order and the lowest-interest order the math can find, the which debt to pay off first page goes further. The single-method pages for the snowball and the avalanche explain each one on its own.
Reading the difference
The comparison shows each method's debt-free month, months to payoff and total interest, along with the difference between them. It is common to see a dollar gap with little or no change in months, because the same total goes out each month either way and only the interest portion shifts.
A difference near zero means the order hardly matters for these debts. A larger figure shows what the snowball's early wins cost in interest for this particular set.