Debt Payoff Calculator: Avalanche vs. Snowball
There are two well-known strategies for paying off multiple debts faster: the avalanche method, which targets the highest-interest-rate debt first, and the snowball method, which targets the smallest balance first. Avalanche is the mathematically optimal choice — it minimizes total interest paid — while snowball tends to build motivation faster because you eliminate individual debts sooner. Enter up to three debts with their balances, APRs, and minimum payments, plus any extra amount you can put toward payoff each month, and this calculator simulates both strategies month by month so you can compare them side by side.
Avalanche (highest APR first)
Snowball (smallest balance first)
Avalanche: The Mathematically Optimal Choice
The avalanche method directs every extra dollar toward the debt with the highest interest rate, regardless of its balance, while still paying the minimum on everything else. Because high-APR balances accrue interest fastest, eliminating them first minimizes the total interest you pay across all your debts combined. The trade-off is psychological: if your highest-rate debt also happens to be your largest balance, it can take a while before you see any single debt disappear entirely.
Snowball: Built for Momentum
The snowball method instead targets your smallest balance first, so you rack up quick wins — full payoffs — earlier in the process, even though it usually costs somewhat more in total interest than avalanche. Behavioral research on debt payoff (popularized by Dave Ramsey) suggests that this early sense of progress helps many people actually stick with a payoff plan long enough to finish it, which matters more in practice than optimizing for a theoretically lower interest bill you might abandon halfway through.
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A note on these calculators: Every tool in this Finance section is an original implementation built directly from standard, publicly known financial formulas — the same loan-amortization math used industry-wide for the mortgage and auto loan calculators, the standard compound-interest future-value-of-an-annuity formula (and its algebraic inverse) for the retirement and savings-goal tools, month-by-month interest-accrual simulation for the debt payoff and credit card payoff tools, the classical “Rule of 72” approximation alongside its precise logarithmic form, and straightforward arithmetic for the budget, net worth, and emergency fund tools. None of these were copied, scraped, or licensed from any specific third-party calculator, publication, or company, and Freedom Wealth Lab is not affiliated with or endorsed by any outside calculator provider. Every formula was independently checked against manual calculations before publishing.
