Debt Avalanche Calculator

What is the debt avalanche method?

The debt avalanche directs every extra dollar at your highest interest-rate debt first, while paying minimums on the rest. Once the priciest debt is gone, you roll its payment onto the next-highest rate. Because you're killing the most expensive interest first, this method mathematically saves the most money and time. The trade-off versus the snowball (smallest balance first) is fewer early "quick wins" — switch the strategy above to compare both on your exact debts.

How this is calculated

We simulate month by month: interest is added to each balance (APR ÷ 12), minimums are paid on every debt, and your extra payment — plus minimums freed when a debt is cleared — is thrown at the target debt. We repeat until every balance is zero, counting months and total interest.

Educational estimate, not financial advice — see our disclaimer.

A debt avalanche example

Say you have three balances and an extra $300 per month to put toward debt on top of the minimums. Imagine a store card at 26% APR with a $2,000 balance, a credit card at 19% APR with a $5,000 balance, and a personal loan at 9% APR with $8,000.

With the avalanche, you keep paying minimums on all three but aim every extra dollar at the highest-rate debt first — the 26% store card. Once it is gone, the freed-up minimum plus your $300 rolls onto the 19% card, then finally the 9% loan. Because the most expensive debt is shrinking fastest, less interest piles up overall. Targeting that 26% balance typically saves more total interest than spreading the same $300 evenly, since the highest rate is where interest grows fastest each month.

When the avalanche wins most

The avalanche shines when there is a big gap between your highest and lowest APRs. If one debt charges 26% and another charges 6%, every dollar you move from the cheap debt to the expensive one works much harder. When all your rates are clustered close together — say everything sits between 14% and 17% — the math difference between avalanche and other orders shrinks, and the choice often comes down to motivation instead of dollars.

• Wide APR spread: the avalanche usually saves the most interest and time.
• Narrow APR spread: the savings gap is small, so pick whichever order keeps you paying.

Avalanche vs snowball: how to decide

The avalanche orders debts by interest rate (highest first) to minimize cost. The debt snowball orders by balance (smallest first) to deliver quick wins that keep you motivated. The avalanche is often cheaper on paper; the snowball often feels better in practice.

A hybrid approach can work well: clear one or two tiny balances first for a confidence boost, then switch to strict highest-rate order for the rest. If most of your debt sits on plastic, the credit card payoff calculator can help you see how a focused extra payment shortens a single card's timeline.

Tips and common mistakes

A few habits make the avalanche method easier to stick with:

• Always keep paying every minimum so you avoid late fees and credit damage.
• Roll each cleared debt's payment into the next target instead of absorbing it back into spending.
• Re-check your rates periodically, since promotional APRs and variable rates can change your order.
• Automate the extra payment so the plan runs even on busy months.

Mistakes that often slow people down:

• Chasing a balance instead of the rate, which can leave costly debt lingering.
• Adding new charges to a card you are trying to pay off.
• Draining every dollar of savings and then leaning on credit again when a surprise bill hits.