The avalanche method targets highest interest rate first. Minimums on everything, extra payments on the highest rate debt. This minimizes total interest paid. The snowball method targets smallest balance first. You get “wins” earlier by eliminating individual debts faster, building momentum.
The Math vs The Psychology
Avalanche always saves more on interest. But the difference is often smaller than expected — for typical $30,000 in mixed debt, maybe $500-$1,500. Research published in the Journal of Consumer Research found people using snowball were more likely to completely pay off their debt. The quick wins provide motivation fuel. Quitting a strategy costs far more than the interest difference.
When Each Makes Sense
Choose avalanche if you have high-rate credit cards (20%+) alongside low-rate student loans (5%). The savings are maximized with a wide rate spread. Choose snowball if you have several small debts that could be eliminated quickly — knocking out three debts in six months creates momentum for the bigger balances.
Compare both with your actual numbers: our free Debt Payoff Calculator shows the side-by-side difference in months, interest, and payoff order.