Avalanche vs. snowball, in short
Both strategies pay every card's minimum, then throw all extra money at one target card until it's gone — they just disagree on which card goes first. Avalanche targets the highest APR; snowball targets the smallest balance. On a $3,000 card at 22.99% and a $1,500 card at 18.99%, with $100 extra a month, avalanche finishes in 25 months for $1,106.91 in interest, and snowball finishes in 26 months for $1,184.03 — a modest $77.12 difference.
Key takeaways
- Avalanche (highest APR first) on the two-card example: 25 months, $1,106.91 total interest.
- Snowball (smallest balance first) on the same example: 26 months, $1,184.03 total interest — $77.12 more.
- Snowball clears the smaller $1,500 card by month 11 for an early psychological win; avalanche leaves it until month 25, prioritizing the higher-rate $3,000 card first (paid off month 21).
- The dollar gap between strategies stays small when APRs are close together (22.99% vs. 18.99% here) — a wider APR spread between cards would make avalanche's advantage larger.
Avalanche vs. snowball: same debt, different order
Take a $3,000 card at 22.99% APR and a $1,500 card at 18.99% APR, with $100 extra a month on top of both minimums:
Avalanche: target the 22.99% card first → payoff in 25 months, $1,106.91 total interest
Snowball: target the $1,500 balance first → payoff in 26 months, $1,184.03 total interest
Avalanche wins on pure math — $77.12 less interest, one month faster. Snowball's edge is psychological: clearing the $1,500 card by month 11 gives a visible win less than a year in, which is worth something if it's what keeps extra payments coming every month.
How the extra payment snowballs (literally)
Once a card hits zero, its minimum payment doesn't disappear from the budget — it gets redirected on top of the extra payment toward the next target card. That's why the payoff accelerates faster than the $100 extra alone would suggest: by the final months of either strategy here, the target card is absorbing $100 plus whatever the already-cleared card used to require every month, which is the actual mechanism behind both methods' names.
When the gap between strategies gets bigger
The $77.12 gap in the example above is modest because the two APRs — 22.99% and 18.99% — are only 4 points apart. Widen that spread (a store card at 29% alongside a card at 15%, for instance) and avalanche's advantage grows substantially, since more of the balance sits at the punishing rate for longer under snowball's ordering. The bigger the APR spread across your actual cards, the more avalanche is worth prioritizing over the psychological boost of snowball.
Related calculators
For a single card without multi-balance strategy comparison, see the credit card calculator. The debt payoff calculator extends avalanche and snowball to non-card debts, and the debt consolidation calculator checks whether combining balances into one lower-rate loan beats either strategy.