Avalanche vs Snowball: Two Ways to Eliminate Debt
I built this calculator to help you compare the two most popular debt payoff strategies and see exactly how long each one takes. Both methods work — the difference is in how you prioritize which debt gets your extra payment each month once you are paying minimums on everything else.
Add all your debts — credit cards, personal loans, car loans — with their balances, minimum payments, and interest rates. The calculator will show you the total interest paid and the payoff timeline under each strategy so you can pick the one that fits your situation.
How Each Method Works
- Debt Avalanche: Pay minimums on all debts, then direct any extra money toward the highest-interest debt first. Once that is paid off, roll that payment into the next highest-rate debt. This method minimizes total interest paid over the life of the debt.
- Debt Snowball: Pay minimums on all debts, then direct extra money toward the smallest balance first. Each paid-off account creates a psychological win and frees up its minimum payment to accelerate the next debt. You may pay slightly more interest overall, but many people find the momentum easier to sustain.
- Extra monthly payment: The single most impactful lever in either strategy. Even a small additional amount each month dramatically shortens the payoff timeline.
Which Strategy Should You Choose?
Use this calculator to run the numbers for your specific debts and decide based on what you see. If the difference in total interest between the two methods is significant, the avalanche is the financially optimal choice. If the difference is small and you know you struggle to stay motivated, the snowball may serve you better in practice — a strategy you stick with beats a mathematically superior one you abandon.
Regardless of which method you choose, the key is to commit to a fixed extra payment each month and not raid the progress you have made. As each debt is paid off, resist the temptation to spend the freed-up minimum payment elsewhere — roll it forward into the next debt to keep accelerating.
Frequently Asked Questions
Should I pay off debt or build an emergency fund first?
Most financial advisors recommend building a small emergency fund — enough to cover one to three months of essential expenses — before aggressively paying down debt. Without any cushion, an unexpected expense forces you back onto credit cards, undoing your progress. Once you have a basic buffer, the math typically favors directing extra income toward high-interest debt rather than low-yield savings.
Does paying off debt improve my credit score?
Yes, in most cases. Paying down revolving debt like credit cards reduces your credit utilization ratio, which directly improves your score. Paying off installment loans like auto loans has a smaller but still positive effect. The biggest credit score gains come from reducing balances on credit cards and consistently making on-time payments.
What if I get a windfall — should I pay off debt all at once?
A lump-sum payoff on high-interest debt is almost always a good use of a windfall, as long as you maintain enough liquidity to cover near-term expenses and emergencies. Before applying a windfall to a loan, check whether there are any prepayment penalties — these are rare on credit cards but do occasionally appear in personal loan or auto loan agreements.
