The math-optimal payoff plan. Pay the minimum on everything, put every extra dollar against the highest-APR debt, and watch your total interest shrink to the lowest possible number. See exactly how much you will save below.
Interest is the cost of debt. The higher the APR, the more each dollar of balance costs you per month. The avalanche eliminates the most expensive dollars first — credit card debt at 24%, then a personal loan at 12%, then a car loan at 6%. By attacking the highest rate, you stop the most interest from accruing as quickly as possible.
The trade-off is patience. Your highest-APR debt may also be a large balance, so the first payoff can take 12–24 months. The snowball method delivers a win in 30–60 days because it targets your smallest balance regardless of rate. Behavioral research is mixed but tends to favor whichever method you will actually finish.
Run both in the calculator above and see the side-by-side comparison to decide which suits your psychology.
The avalanche pays off debts in order of interest rate, highest first. You make minimum payments on every debt and put every extra dollar against the one with the highest APR. Mathematically, this is the cheapest possible payoff path — you eliminate the most expensive interest first.
It depends on the spread between your highest and lowest interest rates. With one or two high-APR credit cards in the mix, the avalanche typically saves a few hundred to a few thousand dollars in total interest. With debts at similar rates, the savings shrink to near-zero. Use the calculator to see your specific number.
Always, on dollars. Almost always, on months. The catch is execution — the first payoff with the avalanche may take a year or more if your highest-APR debt is also a large balance. If you need quick wins to stay motivated, the snowball usually finishes faster in the real world even though it costs more on paper.
Most people exclude long-term low-rate debt (mortgages, federal student loans under 6%) from any payoff plan and focus the avalanche on consumer debt — credit cards, personal loans, and high-rate private student loans. The math gets complicated when tax deductions or income-driven repayment plans enter the picture.
Pure avalanche says it does not matter, but in practice attack the smaller balance first. You get a snowball-style win without losing any interest savings. Most calculators (including this one) handle ties by smaller-balance preference automatically.
Yes, and many people do. Run the snowball until you have eliminated two or three small debts and built momentum, then re-rank your remaining debts by APR and switch to avalanche. The hybrid captures behavioral wins early and math wins late.