Free Debt Snowball vs Avalanche Calculator

Two strategies, two different goals

Both methods work the same way structurally: pay minimums on every debt, then throw every spare dollar at one target debt until it's cleared, then roll that payment onto the next one. The difference is which debt you target first. The avalanche method targets the highest interest rate first, which is mathematically optimal — it minimises the total interest paid across all your debts. The snowball method targets the smallest balance first, which clears individual debts faster and gives you an early win.

Why the "worse" method often works better in practice

On paper, avalanche always wins on total interest. In practice, debt payoff is as much a behavioural challenge as a mathematical one, and a lot of people who start with avalanche lose motivation when the biggest, highest-interest debt takes months to see any visible progress. Snowball trades some interest savings for psychological momentum — clearing a small debt in six weeks instead of six months keeps people engaged with the plan long enough to actually finish it.

Which one is right for you

If you're confident you'll stick with a plan regardless of how slow early progress feels, avalanche saves you real money and there's no downside to choosing it. If you've tried debt payoff plans before and lost steam, snowball's faster early wins are worth the extra interest cost — the plan you actually finish beats the plan that's theoretically optimal but abandoned after three months. Some people use a hybrid: avalanche for large gaps in interest rate, snowball when balances are close enough that the interest difference is small.