Debt Avalanche Calculator

What this calculator does

This calculator runs the debt avalanche strategy across the debts you enter. It pays the minimum on each one and applies any leftover from your monthly budget to the debt with the highest APR. When that's cleared, the freed-up payment moves to the next-highest-rate debt. Mathematically, this minimizes total interest paid — that's always the avalanche's claim to fame.

Why the avalanche wins on math

Every dollar you send to a 22% APR credit card reduces a balance that was charging you 22% per year. Every dollar to a 6% auto loan reduces a balance charging only 6%. Targeting the highest rates first eliminates the most expensive interest the fastest. The snowball method makes you feel good faster, but the avalanche puts more dollars in your pocket.

When to pick snowball instead

If you've tried payoff plans before and lost momentum, the psychological win of clearing a small debt fast can be worth the small extra interest. The two methods often differ by only a few hundred dollars over the full plan.

How to maximize the avalanche

• Refinance the highest-APR debt first. A balance transfer card or personal loan can drop a 22% APR to under 10% and dramatically accelerate the avalanche.
• Don't add to balances. The avalanche works only if balances keep shrinking. Switch to debit or cash while paying off.
• Roll over freed-up payments. When debt #1 clears, its full minimum + extras goes to debt #2. This rollover is what accelerates the schedule.
• Keep a small emergency fund. A surprise expense shouldn't push you back to the cards mid-plan.

Frequently asked questions

What is the debt avalanche method?

The avalanche method orders your debts from highest to lowest interest rate (APR), regardless of balance. You pay the minimum on everything and throw any extra at the highest-APR debt first. When that's cleared, the freed-up payment moves to the next-highest APR. Mathematically, this minimizes the total interest you'll ever pay.

How much can I save vs the snowball method?

It depends on the spread between your highest and lowest APRs. A typical multi-debt scenario (credit card at 22%, auto loan at 6%) saves a few hundred to a few thousand dollars in interest with avalanche. Run both options in this calculator with your actual numbers — the gap might be smaller than you'd expect.

What if I have a 0% APR card mixed with high-APR debts?

Pay only the minimum on the 0% card while it lasts (capture the interest-free period). Throw all extras at your highest-APR debt. Just put a calendar reminder a month before the 0% promo expires — if there's still a balance, the rate will jump and you may need to re-prioritize.

Should I consolidate before starting?

If you can refinance high-APR credit card debt to a fixed-rate personal loan in the 8–12% range, you'll save substantially. A balance transfer card with 0% intro APR for 12–21 months is even better, if you have the discipline to clear the balance during the intro period. Run the avalanche on the new, lower rate after consolidation.

Why does the avalanche save more than the snowball?

Every extra dollar you pay reduces the principal a debt is charging interest on. Sending those dollars to the highest-APR debt eliminates the most expensive interest fastest. Sending them to the smallest debt (snowball) feels good but loses ground each month on the high-APR account.

What if I lose motivation halfway?

Switch to snowball. The math advantage of avalanche is small enough that finishing the plan with snowball will always beat abandoning the plan with avalanche. Many people use a hybrid — clear one or two small debts first for the wins, then switch to avalanche on the larger remaining balances.