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Add your credit cards and see the mathematically optimal payoff order to minimize total interest paid.
The debt avalanche is the mathematically optimal way to pay off multiple credit cards. By targeting your highest-interest-rate debt first, you reduce the rate at which interest compounds on your total outstanding balance. Every dollar of extra payment does more work when applied to a 26% APR card than a 17% APR card — the difference compounds month after month.
On a realistic set of cards — say, three cards totaling $15,000 with APRs of 28%, 22%, and 16% — the avalanche method typically saves $400–$1,500 in total interest compared to the snowball, depending on the balance distribution. The savings are larger when the highest-rate card also carries a significant balance. Use this calculator alongside our debt snowball calculator to see the exact dollar difference for your specific situation.
If the difference in interest cost is small for your cards, the snowball's motivational benefits may outweigh the avalanche's mathematical edge. Whatever method you choose, the most important thing is starting. Our payoff guide covers both methods in detail, and our tips page offers practical strategies for finding extra money to direct at debt. Use the main credit card payoff calculator for single-card calculations.
List all your credit cards from highest APR to lowest. Pay minimums on every card, then direct all extra money at the highest-rate card. When that card reaches zero, take its entire monthly payment and add it to the minimum on the next highest-rate card. Repeat until all balances are gone. This method minimizes the total interest you pay because you're always attacking the debt that accrues interest fastest.
The savings vary based on your specific balances and APRs. In cases where the highest-APR card has a large balance, the avalanche can save $500–$2,000 or more. When the highest-APR card has a small balance (which would be paid off quickly with either method anyway), the difference narrows. Run both calculators and compare the total interest paid — sometimes the difference is smaller than expected, which might tip the scales toward the snowball's motivational advantage.
This is where the avalanche requires the most patience. You'll be paying down a large, high-interest balance for a long time before your first payoff milestone. Some people set intermediate goals — for example, paying off each $1,000 increment — to maintain motivation. Others in this situation do a hybrid: use the snowball to eliminate one or two small cards first for a quick psychological win, then switch to the avalanche for the larger balances.
Use the avalanche if you're numbers-driven, disciplined, and motivated by optimizing total cost. Use the snowball if you need fast wins to stay motivated or have struggled to follow through on debt payoff plans before. Research from Harvard Business School found that people focused on paying off individual accounts were more likely to become debt-free — suggesting behavioral factors often outweigh mathematical optimization. Run both with our calculators and compare, then choose the one you'll actually stick with.
Last updated: June 2025