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Free · Highest APR first · Math-optimal

Debt avalanche calculator — highest-APR-first method

The avalanche method attacks debts in descending APR order — mathematically the cheapest path out. See your total interest saved vs the snowball method.

Equal-budget repayment comparison · Snowballr Research · /research/debt-snowball-vs-avalanche-1000-scenarios
Median interest gap $398 across 994 fully repaid synthetic pairs
Avalanche directs extra payments to the highest APR while maintaining minimums on the other debts. Our corrected simulation retains released minimums in every later month under both methods. 6 unfinished profiles are excluded from payoff comparisons; the study does not measure behavioral completion.
Use the downloadable starting debts to reproduce a scenario, then compare your own balances, rates and payment budget.
Strategy
Choose your payoff method
Your debts
4 debts · Total: $35,800
53% utilization
63% utilization
$200
Applied on top of minimum payments to accelerate the snowball
Debt-free in
3y 11m
Interest paid
$4,815
Total paid back
$40,615
Comparison
Snowball vs Avalanche
❄️ Snowball
Time:3y 11m
Interest:$4,815
🏔️ Avalanche
Time:3y 11m
Interest:$4,730
💡 Avalanche saves you $85 in interest, but snowball gives faster psychological wins.
Payoff order
When each debt disappears
Debt payoff chart with 4 debts. Longest payoff: Student loan in 3y 11mo. Total interest paid across all debts: $4,816.Horizontal bar chart showing months until each debt is fully paid off. Hover for individual debt details.Store credit4moCredit card1y 7moCar loan2y 6moStudent loan3y 11mo0mo9mo19mo28mo38mo47mo

Why avalanche saves more interest

Interest accrues daily on every dollar of debt at each debt's APR. A $5,000 balance at 24% APR generates $1,200/year of interest. A $5,000 balance at 6% generates $300/year. Killing the higher-APR debt first stops the bigger interest stream faster.

The gap depends on the balances, APR spread, minimums, fees, payment timing and extra amount. Re-run both orders with the same inputs; a study of modeled profiles is context, not a prediction for your debts.

Avalanche vs snowball — when each wins

ScenarioBetter method
One huge high-APR debt + small low-APR debtsAvalanche
Several small debts of similar APRSnowball (psychological wins)
You've quit debt plans beforeSnowball (momentum matters)
You're a spreadsheet personAvalanche
Debt mix has wide APR spread (5% to 28%)Avalanche (big savings)

Avalanche execution checklist

  1. Sort debts by APR, descending
  2. Pay minimums on every debt every month
  3. Send all extra cash to the top-APR debt
  4. When debt #1 clears, redirect its full payment to debt #2
  5. Continue down the list — never pay any debt below minimum

Debt Avalanche Calculator FAQ

Avalanche vs snowball — which should I use?

Avalanche minimizes modeled interest when rates and payments are fixed. Snowball may fit better when earlier account milestones help you stay engaged. Compare both orders with the same inputs and choose the one you can maintain.

Does avalanche always save money vs snowball?

With the same balances, rates, minimums and extra payment, avalanche is the interest-minimizing order for standard amortizing debts. The gap can be small or large depending on APR differences, fees, payment rules and rate changes; run both orders rather than assuming a fixed percentage.

What if my smallest debt is also my highest APR?

Both methods agree — start there. Snowball and avalanche only diverge when balance and APR rankings conflict. When they align, momentum and math both win at once.

Should I switch from snowball to avalanche mid-plan?

Switching changes the modeled order and may change total interest or milestones. Compare the remaining balances, APRs, fees and payment rules, then choose the order you can follow without missing minimums.

Does avalanche apply to my mortgage?

Include a mortgage only if you are comparing its required payment and extra-principal rules with the other debts. Compare the mortgage rate, tax treatment, liquidity, prepayment terms and unsecured-debt protections instead of applying a universal order.

What if APRs change during my plan?

Re-check the order whenever a rate, fee, minimum payment or promotional period changes. Variable-rate and promotional debts need the current lender disclosure; federal and private student-loan rules also depend on the loan and program.

Related calculators

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Step-by-step framework.
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When to switch focus.

Methodology and editorial standards

Each calculator uses its own inputs and method. Review the labels, units and assumption notes shown with the result. Costs, taxes, fees, benefits and other factors are not modeled unless the page or calculator explicitly says they are. A fixed-rate projection is a scenario, not a forecast or personalized recommendation.

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