Debt Payoff Calculator
Avalanche method — highest interest first
See exactly when you'll be debt-free and how much interest you'll save using the avalanche method vs. minimum payments.
Avalanche method — highest interest first
Two strategies dominate personal finance advice on debt payoff: the avalanche, which targets the highest interest rate first, and the snowball, which targets the smallest balance first. They are often presented as opposites. They are really solving different problems — one optimizes for math, the other for psychology. Both beat the minimum-payment trap by a wide margin.
The avalanche method directs all extra payments toward the debt with the highest APR while making minimum payments on everything else. Once the highest-rate debt is eliminated, you roll that freed-up payment into the next highest-rate debt. The result: you pay less total interest over the course of your payoff. For a $20,000 credit card balance at 24% APR at $500 per month, you would pay roughly $7,400 in total interest. Paying a lower-rate debt first while the 24% balance accrues is costly — the math is unambiguous.
The snowball method ignores interest rates and targets smallest balances first. You get wins faster — eliminating one debt entirely creates momentum and simplifies your financial picture. Research in behavioral economics consistently shows that debt payoff rates improve when debtors see accounts close, even when those closures are mathematically suboptimal. The practical difference in total interest paid between avalanche and snowball is often $500–$2,000 over a multi-year payoff. For many people, that premium buys enough motivation to actually finish.
Both methods share a critical insight: minimum payments are designed to keep you in debt as long as possible. On a $10,000 balance at 21% APR, paying only the minimum (typically 2% of the balance) will take over 30 years and cost more than $16,000 in interest — more than the original balance. Adding just $100 per month above the minimum drops the payoff timeline under 8 years and cuts total interest by more than half. The size of the extra payment matters less than the consistency of making one.
Many people find the best approach is a hybrid: snowball to get the first quick win, then switch to avalanche. Closing one small account immediately creates the psychological momentum of the snowball method, while the remaining debt is attacked in the mathematically optimal order. If you have one account that is nearly paid off, finish it before switching strategies — the cost of that one deviation from avalanche is small, and the motivational boost is real.
A 0% APR balance transfer card — if you qualify — effectively changes the avalanche math entirely. Moving a high-rate balance to a 0% promotional offer (typically 12–21 months) allows 100% of your payment to reduce principal. The transfer fee is typically 3–5% of the transferred balance. Compare that fee against the interest you would pay during the promotional period: on a $5,000 balance at 22% APR over 15 months, you would pay approximately $1,375 in interest versus a $150–$250 transfer fee. The math usually favors the transfer.