Avalanche pays the highest-interest debt first — mathematically optimal, lowest total interest paid.
Snowball pays the smallest balance first — emotionally optimal, fastest sense of progress.
If the interest rate gap is large (e.g., a 24% card vs 6% loan), avalanche wins meaningfully. If rates are similar, snowball's motivation often wins overall, because it is the plan you actually finish.
Key takeaways
- Avalanche minimizes interest; snowball maximizes momentum.
- Pick the method you will actually stick with.
- Re-run the numbers after every paid-off debt.
Apply it with these calculators
Written and reviewed by
Keiron Brown, Psy.D.
Founder & Lead Educator, CalculatingWealth
Keiron Brown, Psy.D., is a clinical psychologist and the founder of Relationale LLC, which publishes CalculatingWealth. His doctorate is in psychology, not finance: he is not a registered investment adviser, accountant, or attorney, and nothing here is financial, investment, tax, or legal advice. His work here focuses on financial education, critical thinking, and decision-making — helping people understand the math behind money so they can plan with clarity and confidence. He writes about wealth building, retirement planning, investing literacy, budgeting, and the behavioral patterns that shape long-term financial outcomes.
Editorial standards: All educational content on CalculatingWealth is reviewed for accuracy, sourced from primary references where applicable (IRS, SSA, Federal Reserve, BLS), and updated when rules or rates change. Content is for educational and informational purposes only and does not constitute financial, investment, tax, or legal advice.
Not advice: Keiron Brown is not a registered investment adviser, broker-dealer, certified public accountant, enrolled agent, attorney, or licensed insurance producer. His work is educational in nature. See our full disclaimer.