Reckix
Free money tools · no signup · nothing leaves your browser

Debt Payoff Planner: Avalanche vs Snowball, on your real debts

List your debts, set one extra monthly payment, and watch both strategies race: the avalanche (highest APR first) against the snowball (smallest balance first). You get a debt-free date for each, total interest for each, and the exact dollars-and-months gap — every payoff uses the debt-rollover method, where each finished debt's minimum joins the attack on the next one.

Updated July 7, 2026 · methodology and formulas below · results update live as you type

Your debts up to 8 — cards, loans, anything with a minimum

Editable examples below — the three starter debts use typical mid-2026 APRs (data as of July 2026, directional). Replace them with your own balances from your latest statements.

The verdict
—
Avalanche
highest APR first — least interest
—
debt-free date
Months to payoff—
Total interest paid—
Total paid—
Payoff order
    Snowball
    smallest balance first — quick wins
    —
    debt-free date
    Months to payoff—
    Total interest paid—
    Total paid—
    Payoff order

      Total balance, month by month

      AvalancheSnowball
      Link copied — your debts are encoded in it.
      Worth checking
      0% balance-transfer intro offers (typically 12–21 months at 0% APR, for a one-time 3–5% transfer fee) can wipe out card interest while you attack the balance — often a bigger win than either strategy alone on high-APR cards. Compare the fee against the interest this planner shows you'd pay. Not yet active. If these links become active, they will be clearly disclosed here and will never affect the result above.

      How this is calculated

      1. Your monthly attack budget. Every month you pay the same total: budget = sum of all minimum payments + extra payment. The budget never shrinks — that's the debt-rollover method. When a debt is finished, its minimum doesn't go back in your pocket; it joins the extra payment and rolls into the next target. That snowballing of freed-up minimums is what makes both strategies fast.
      2. Interest, month by month. Each simulated month, every open debt first accrues interest on its remaining balance: interest = balance × APR ÷ 12. Then every open debt receives its minimum payment, and the leftover budget (extra + freed-up minimums) all goes to the target debt. If the target is finished mid-month, the remainder cascades to the next target the same month.
      3. The only difference between the strategies is the target. Avalanche targets the highest APR (ties broken by smaller balance); snowball targets the smallest balance (ties broken by higher APR). Avalanche is mathematically optimal: every extra dollar retires the most-expensive principal first, so total interest is always the minimum possible and the payoff date is never later than snowball's. Snowball wins on behavior — studies of real borrowers (including Kellogg School research on "small victories") find that closing whole accounts early keeps people paying extra, and a plan you stick with beats a plan you abandon. The verdict box above prices that trade-off for your exact debts.
      4. Guard rails. If a debt's monthly interest is at least as large as its minimum payment, the minimum can never retire it — the planner flags that debt instead of pretending. The simulation also hard-stops at 600 months (50 years) and tells you if the plan never finishes.

      What this doesn't model: daily compounding on average daily balance (real card interest runs slightly different from the monthly model), promotional/deferred rates, variable APR changes, new spending on the cards, late fees, or minimums that shrink as the balance falls (we hold minimums fixed, which is what most payoff plans assume — keep paying the original minimum). It's a planning estimate, not a statement schedule.

      Written and maintained by The Reckix Team, the team behind Reckix — free, transparent calculators that show their formula and cite their 2026 data sources. Methodology follows the standard debt-rollover model used by nonprofit credit counselors; avalanche-vs-snowball behavioral findings per published consumer-finance research. Last reviewed July 7, 2026.

      Frequently asked questions

      Which is better, debt avalanche or debt snowball?

      Mathematically, the avalanche method (paying extra toward the highest-APR debt first) always finishes with the least total interest and never later than snowball. But research on real borrowers finds the snowball method (smallest balance first) produces quick early wins that help people stick with the plan. This planner shows the exact dollar-and-month gap between the two on your debts, so you can decide whether the avalanche savings are worth more to you than the snowball momentum.

      Should I include my mortgage in a debt payoff plan?

      Usually no. Avalanche and snowball plans are designed for consumer debts — credit cards, car loans, personal loans, student loans. Mortgages have low rates, very long terms, and potential tax treatment that make them a separate decision; adding a 30-year mortgage would also dominate the chart and hide your real progress. Most planners recommend attacking consumer debt first, then deciding separately whether to prepay the mortgage or invest.

      What if I can't afford the minimum payments on my debts?

      Neither avalanche nor snowball works until every minimum is covered — this planner will warn you when a debt's monthly interest is as large as its minimum payment, because such a debt never pays off. If you're in that spot, options include calling the lender for a hardship plan, a nonprofit credit-counseling agency's debt-management plan, consolidating at a lower rate, or a 0% balance transfer. Talk to a qualified counselor; this tool is an estimator, not advice.

      How is the interest on each debt calculated?

      Each simulated month, every open debt accrues interest equal to its remaining balance times APR divided by 12 (the monthly periodic rate). Payments are then applied: the minimum on every debt, with the extra payment plus any freed-up minimums from already-paid-off debts going to the target debt. Real card issuers compound daily on average daily balance, so real totals will differ slightly — the monthly model is the standard planning approximation.

      Does this planner store or send my debt information?

      No. Everything runs in your browser and nothing you type is sent to a server. The "copy shareable link" button encodes your debts into the link itself, so only people you share that link with can see them.

      Advertiser disclosure: This page may display ads and, in the future, links to balance-transfer credit cards, consolidation lenders, or other financial products that pay us a referral fee if you use them. That never changes the math above, which is independent of any advertiser. We do not accept payment for favorable results. Affiliate and lead-gen links are not active on this site; if that ever changes, any paid link will be clearly disclosed here and will never affect a tool's result.

      This planner is an educational estimate, not financial advice, not credit counseling, and not a debt-relief offer. Real interest accrual, fees, and minimum payments vary by lender; verify your plan against your statements or with a qualified counselor. No liability is accepted for decisions made from these results.