Highest interest rate first — the mathematically fastest way to save on interest
💡 Why This Matters The avalanche method targets your highest-interest debt first, no matter the balance — minimizing every dollar of interest you'll pay before you're debt-free. If saving the most money matters more to you than early psychological wins, this is the optimal order. Enter up to 4 debts and see your exact timeline.
Credit cards routinely carry APRs above 20-25% while personal loans and auto loans often sit in the single digits or low teens — so in a mixed debt load, avalanche almost always means attacking credit card balances first, regardless of which one is largest.
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List every debt with its balance, interest rate, and minimum payment, then sort them by interest rate — highest to lowest, ignoring balance size entirely. Put every extra dollar toward the highest-rate debt while paying only the minimum on the rest. Once it's paid off, roll its minimum payment into the next-highest-rate debt, and repeat until everything is gone.
Your payoff order tells you exactly which debt to attack first for maximum interest savings — this may not be your largest or smallest balance, just whichever carries the steepest rate. The months-to-debt-free and total interest figures account for interest compounding on every debt every month, giving you the real mathematical cost of your current plan.
Avalanche is the cheapest method on paper, but it can mean your first "win" takes much longer if the highest-rate debt also has a large balance — some people lose motivation before reaching that first payoff. If staying motivated matters more to you than shaving off the last few hundred dollars of interest, the snowball method's early quick wins may serve you better in practice.
Set up autopay for the minimum on every debt except your current target, then send every spare dollar there. When it hits zero, redirect its full payment immediately to the next highest-rate debt on your list. Re-run this calculator any time a rate changes (a promotional APR expiring, a balance transfer, a refinance) since that can reshuffle your optimal order.
Example: Same three debts as the snowball example — an $800 store card at 9% APR, a $4,000 personal loan at 14% APR, and a $7,000 credit card at 26% APR — with an extra $250/month. Avalanche order: the $7,000 credit card first (highest rate), then the $4,000 loan, then the $800 store card. Result: debt-free in 27 months, paying $2,734 in total interest — $814 less than the snowball method on the same debts.
Interest accrues fastest on your highest-rate debt, so eliminating it first minimizes the total interest you pay over the life of all your debts combined. It's the mathematically optimal order — you'll almost always pay less overall than with any other strategy.
No. Avalanche orders debts by highest interest rate first to minimize total interest paid. Snowball orders by smallest balance first to maximize early psychological wins. Avalanche usually saves more money; snowball is often easier to stick with.
It depends entirely on your specific debts — the savings are largest when a big balance also carries a high interest rate. In some cases the two methods land on nearly the same order and cost about the same; in others avalanche saves hundreds of dollars. Run both calculators with your real numbers to see your own gap.