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Free Debt Payoff Calculator — Avalanche vs Snowball Strategy Comparison

Enter all your debts, add an extra monthly payment, and instantly compare how much faster and cheaper the debt avalanche pays off vs. the debt snowball.

This free debt payoff calculator runs both the avalanche (highest APR first) and snowball (lowest balance first) strategies simultaneously, shows you the interest savings and months saved, and lists the exact payoff order for each debt. No sign-up required.

Avalanche vs Snowball — How Each Works

Debt Avalanche: Pay minimums on all debts. Send every extra dollar to the highest-APR debt. When that's paid off, roll its full payment to the next highest-APR debt. This method minimizes the total interest paid — mathematically optimal.

Debt Snowball: Pay minimums on all debts. Send every extra dollar to the lowest-balance debt. Quick wins build momentum and motivation. Research (Harvard Business Review, 2016) found snowball users eliminate more debt over time because momentum drives behavior.

The choice depends on your psychology as much as your math. Use this calculator to see exactly how much the avalanche saves over snowball for your specific debts — then choose the strategy that matches your personality. For more on managing individual debts, see our credit card payoff calculator.

How to Use This Calculator

  1. 1

    Enter Each Debt

    Name each debt (Credit Card, Car Loan, etc.), enter the current balance, APR, and minimum monthly payment. You can add up to 20 debts. Get these numbers from your statements.

  2. 2

    Set an Extra Monthly Payment

    How much extra can you pay per month on top of all minimums combined? Even $100 extra per month makes a significant difference. This extra amount is applied to your priority debt in each strategy.

  3. 3

    Compare the Two Strategies

    The calculator runs both strategies simultaneously and shows which saves more interest, how many months faster it finishes, and the exact order each debt gets paid off. Use the result to commit to one strategy and stick with it.

Frequently Asked Questions

What is the debt avalanche method?
The debt avalanche method prioritizes paying off debts with the highest APR first, while making minimum payments on all others. Once the highest-APR debt is eliminated, roll that payment to the next highest-APR debt. Mathematically optimal — saves the most interest dollars. On a $20,000 debt mix (credit card at 24%, car at 6%, personal loan at 12%), avalanche targets the credit card first.
What is the debt snowball method?
The debt snowball method (popularized by Dave Ramsey) pays off the smallest balance first, regardless of APR, while making minimums on the rest. Each paid-off account provides a psychological win that motivates continued payoff. Research shows snowball users are more likely to complete debt payoff because of these psychological rewards — even if it costs slightly more in interest.
Which is better: debt avalanche or debt snowball?
Avalanche saves more money. Snowball provides more motivation. The best strategy is the one you stick with. On a typical debt mix ($5K at 22%, $2K at 16%, $10K at 8%): avalanche saves about $500–$800 more than snowball over the payoff period. But if avalanche feels discouraging because the high-APR balance is large, snowball's wins might help you stay on track and avoid giving up.
How much extra should I pay toward debt each month?
Even $100–$200 extra per month dramatically accelerates debt payoff. On $20,000 in debt at average 15% APR: minimum payments only = 7+ years. Extra $200/month = 3 years, saves $8,000+ interest. Apply all extra money to one debt at a time (your target debt), not spread across all debts — concentration is more efficient than distribution.
What is debt consolidation and when does it make sense?
Debt consolidation combines multiple high-APR debts into one lower-APR loan or balance transfer. Makes sense when: (1) You can qualify for a rate significantly below your current average APR, (2) You won't accumulate new debt on cleared cards, (3) The consolidation fee (3–5%) is less than the interest savings. A $15,000 credit card balance at 22% APR consolidated to 10% personal loan saves $7,000+ over 3 years.
What is the fastest way to pay off $20,000 in debt?
Three-step approach: (1) Stop adding new debt — cut up cards if needed. (2) Build a $1,000 emergency fund first so you don't go back into debt for emergencies. (3) Apply the debt avalanche — minimum payments on everything, every extra dollar to the highest-APR debt. At $500/month extra toward $20,000 at average 15% APR, you're debt-free in under 3 years and save $12,000 in interest vs minimums.

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