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: May 2026
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 paying them off in sequence, one at a time, putting your full monthly payment budget toward whichever bucket is targeted first. The debt avalanche method always targets the higher-rate bucket first, minimizing total interest paid. The debt snowball method always targets the smaller-balance bucket first, providing quicker psychological wins. Each bucket's interest is approximated as balance × annualRate / 100 / 12 × months, where the targeted bucket's months are ⌈balance / totalMonthlyPayment⌉ and the waiting bucket accrues over the full combined timeline (it isn't paid down until its turn, a simplification since this calculator doesn't model separate minimum payments per bucket). The savings figure shown is snowballInterest − avalancheInterest. When the high-interest bucket also happens to be the smaller balance, both methods target it first and the two strategies genuinely tie at $0 savings — that isn't a bug, avalanche and snowball only diverge when the higher-rate debt and the smaller-balance debt are different buckets.
How to use
Assume total debt = $10,000, high-interest debt = $6,000 at 20% APR, low-interest debt = $4,000 at 6% APR, and monthly payment budget = $500. Avalanche targets the $6,000/20% bucket first (higher rate): it clears in ⌈6,000/500⌉ = 12 months, costing 6,000 × 20%/12 × 12 = $1,200 interest; the $4,000/6% bucket then waits the full 20 months (12 + 8) before its own 8-month payoff, costing 4,000 × 6%/12 × 20 = $400. Avalanche total = $1,600. Snowball targets the $4,000 bucket first (smaller balance): it clears in ⌈4,000/500⌉ = 8 months, costing 4,000 × 6%/12 × 8 = $160; the $6,000/20% bucket then waits the full 20 months before its own 12-month payoff, costing 6,000 × 20%/12 × 20 = $2,000. Snowball total = $2,160. Savings = $2,160 − $1,600 = $560 by choosing avalanche. Enter your real balances to see your personalized savings.
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.