Debt Avalanche Calculator

The debt avalanche method is the mathematically optimal strategy for paying off multiple debts — it minimizes the total interest you pay over the life of all your debts. It works by directing every extra dollar to the highest-interest-rate debt first, regardless of balance size.

How the debt avalanche works: list all debts from highest to lowest interest rate. Make minimum payments on all debts. Put every extra dollar toward the highest-rate debt. When it's paid off, roll its former payment into the next-highest-rate debt. The total payment amount never decreases — it just gets redirected as each debt is eliminated.

Avalanche vs. Snowball — the math: The avalanche method almost always results in paying off debt faster and with less total interest compared to the snowball. The advantage grows with the interest rate spread between your highest and lowest rate debts. If your debts range from 5% to 25% APR, the avalanche saves significantly more than if they all hover between 10–15%.

The psychological challenge: if your highest-rate debt also has a large balance, you might not see a debt fully paid off for a year or more. Some people find this demotivating. If you find yourself struggling to stay on track, switching to the debt snowball — or a hybrid approach — is better than abandoning the payoff plan entirely.

Hybrid approaches: Some financial planners recommend paying off one or two small debts first (snowball) to build momentum and simplify the debt list, then switching to the avalanche for the remaining larger debts. This "slingshot" approach captures both the motivational benefits of quick wins and the interest savings of rate-prioritization.

Balance transfers can supercharge either method: moving high-rate balances to a 0% APR promotional card (12–21 months) eliminates interest entirely during the period, making the mathematical advantage of the avalanche even more powerful.