Debt Avalanche vs Snowball Calculator
Compare how much interest you save by tackling high-rate debt first (avalanche) versus smallest balance first (snowball). Find out which strategy costs you less overall.
Last updated: September 2026
Formula below · 2 sources (CFPB, Wikipedia) · Updated Sep 2026
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About this calculator
This calculator splits your debt into two buckets, the high-interest amount you enter and the remaining ("low-interest") balance, and simulates both strategies month by month. Each month both balances accrue interest at their own rate, then your whole payment budget goes to the targeted bucket, with any leftover spilling over to the other one. The debt avalanche targets the higher-rate bucket first, which minimizes total interest; the debt snowball targets the smaller balance first for quicker psychological wins. Savings = snowball interest − avalanche interest. Real accounts also require minimum payments on every debt, which narrows the gap a little, so treat the result as a close estimate. When the high-interest bucket is also the smaller balance, both methods target it first and the strategies genuinely tie at $0. If the budget cannot cover the interest, the debt never clears and the calculator says so.
How to use
Assume total debt = $10,000: $6,000 at 20% APR and $4,000 at 6% APR, with a $500 monthly budget. Avalanche pays the $6,000 balance first and is debt-free in 23 months with about $1,135 of interest. Snowball pays the $4,000 balance first while the 20% debt keeps growing, finishing in 24 months with about $1,958 of interest. Choosing avalanche saves $823.27. With the default inputs ($12,000 at 24.99% and $6,000 at 12.5%, $800 a month) avalanche costs about $4,185 in interest over 28 months versus $6,043 over 31 months for snowball, a $1,857.65 saving.
Frequently asked questions
How much money does the debt avalanche method save compared to the snowball method?
The savings depend on the interest rate gap between your debts and how long repayment takes. When the rate difference is large — say 20% vs. 5% — the avalanche can save hundreds to thousands of dollars in interest. When rates are similar, the difference shrinks considerably. Use this calculator with your actual balances and rates to get a personalized estimate before choosing a strategy.
When should I choose the debt snowball method over the avalanche method?
Choose the snowball when you need motivational momentum to stay on track. Paying off smaller balances quickly delivers tangible wins that research shows help people stick to their repayment plans. If you have struggled to maintain discipline with debt payoff in the past, the psychological benefit of the snowball may outweigh its higher interest cost. The best debt strategy is the one you will actually follow through to completion.
Does the debt avalanche method always pay off debt faster than the snowball method?
Not necessarily faster in total months, but it almost always costs less in total interest. The avalanche reduces the principal balance of your most expensive debt first, slowing the compounding of high-rate interest. The snowball can occasionally pay off total debt in a similar timeframe if small balances happen to carry the highest rates. In most real-world scenarios, however, the avalanche finishes at a comparable speed while saving meaningful money on interest charges.