Debt Payoff Calculator

The debt avalanche method is a debt payoff strategy where you direct all extra payments toward the debt with the highest interest rate (APR) while making minimum payments on all other debts. Once the highest-APR debt is paid off, you roll its minimum payment plus the extra payment onto the next highest-APR debt. This method is mathematically optimal — it minimizes the total interest you pay over the life of your debts. For example, if you have a credit card at 22% APR and a car loan at 7% APR, the avalanche method tackles the credit card first even if its balance is larger.

The debt snowball method is a debt payoff strategy popularized by personal finance author Dave Ramsey. Instead of targeting the highest interest rate, you focus extra payments on the debt with the smallest balance first, regardless of its interest rate. Once that debt is paid off, you roll its payment into the next smallest balance, and so on — creating a growing "snowball" of payments. While the snowball method typically costs more in total interest than the avalanche method, research in behavioral economics (including a Harvard Business Review study) suggests it produces higher rates of success because early wins build motivation and momentum.

The avalanche method almost always saves more money in total interest paid, sometimes by hundreds or even thousands of dollars depending on your debt mix and interest rates. The difference is largest when you have high-APR debts with large balances — in those cases, paying them off faster prevents interest from compounding for an extended period. The snowball method may cost more but can keep you psychologically motivated. A 2016 study by Ravi Dhar and colleagues found that eliminating individual accounts (snowball behavior) improved the likelihood of staying on a debt payoff plan. The best method is the one you will actually stick with.

Debt rollover (also called the debt snowball or avalanche roll) is what happens when one of your debts reaches a zero balance. Instead of reducing your total monthly payment, you redirect that debt's former minimum payment toward the next target debt. This accelerates payoff dramatically over time because your effective payment toward the focus debt keeps growing with each payoff. For example, if you were paying $100/month minimum on a card you just paid off, that $100 gets added to your extra payment, increasing the attack on your next target. Combined with your original extra payment, the cumulative payoff power compounds with each debt eliminated.

The classic rule of thumb is to compare your debt's interest rate with your expected investment return. If your debt carries an interest rate higher than your expected after-tax investment return (historically around 7–10% for a diversified stock index), paying off the debt first is the better risk-adjusted choice. High-interest consumer debt (credit cards at 20–30% APR) should almost always be paid off before investing beyond an employer 401(k) match. For lower-rate debt (student loans or car loans at 5–7%), the decision is closer — many financial planners suggest a hybrid approach: invest enough to capture employer match, build a 3–6 month emergency fund, then aggressively pay off any debt above 7–8% APR before adding more to investments.

Debt consolidation replaces multiple debts with a single new loan, ideally at a lower interest rate. This simplifies payments and can reduce total interest if you qualify for a significantly lower APR. However, consolidation requires good-to-excellent credit to secure a better rate, and some loans carry origination fees (1–8%) that reduce savings. The avalanche and snowball methods do not require any new financing — they work with your existing debts and a disciplined payment structure. Consolidation can be combined with the avalanche or snowball approach: after consolidating higher-rate debts, you can still apply the rollover strategy to remaining debts. Use our Debt Consolidation Calculator to compare interest costs side-by-side before deciding whether to consolidate.