How this calculator works
Each line should be: balance, APR (example: 3200 14.5). The calculator accrues monthly interest on every balance, pays the smallest first with your full budget, and simulates month by month until everything hits zero.
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Debt Snowball Calculator — Pay Off Multiple Debts
The snowball method: pay minimums on everything, throw all extra cash at the smallest balance, then roll each freed payment into the next debt. List your debts below — one per line.
How the month-by-month simulation works
The calculator treats your budget as a single monthly war chest. Each simulated month it first accrues interest on every open balance at that balance times its APR divided by 12, because interest is charged on what you still owe, not on the original amount. Then it pays the required minimums where they fit inside the budget and throws everything remaining at the target debt, smallest balance first in the snowball order. When a debt hits zero its minimum payment is freed and rolls into the attack on the next balance, which is the snowball effect that makes the payoff accelerate rather than march linearly. Two behaviors fall out of this structure. Early months barely dent total balance because interest consumes a large share of the budget. Once the first debt closes, the freed payment lands on the next balance all at once, and the timeline visibly steepens. If the simulation never reaches zero, your budget is below the monthly interest accruing across all debts, and no ordering can fix that gap.
Snowball versus avalanche with real numbers
The comparison is narrower than the debate suggests. Run the sample debts, $5,200 at 21.9 percent, $3,200 at 14.5 percent, $11,500 at 6.5 percent, with a $1,000 budget and both orders finish in about 22 months; avalanche pays roughly $1,649 of total interest against snowball $1,783, a difference near $134. Avalanche wins more when rate spreads are wide and the high-rate balance is big; it wins less when the smallest balance is also the highest-rate one, in which case the orders converge. Behavioral research consistently shows snowball users are more likely to complete the plan, because closing accounts produces visible wins, and an abandoned avalanche saves nothing. A hybrid is legitimate: clear one small nuisance balance first for momentum, then switch to strict rate order. The real lever in every scenario is the budget line. Adding $100 per month to the war chest typically saves more interest than any reordering of the same $1,000.
Building the monthly budget that actually finishes
The budget field is a promise you can keep for two or three years, not a sprint number. Build it bottom-up: list take-home pay, subtract fixed obligations, then decide the debt line before choosing discretionary spending, so it is funded rather than residual. Anchor it to something durable, a permanent cut in one subscription category, a standing transfer the day after payday, not to a temporary burst of willpower that fades in month four. Stress-test it: if the plan collapses when a $400 repair lands, the budget was too tight, and a slightly lower figure that survives bad months beats an aggressive one that breaks. Two accelerators pair well with this calculator. A one-time lump from a tax refund or bonus, entered by temporarily raising one month of budget, removes interest for every remaining month. And a rate reduction negotiated with a card issuer, typically two to five points for callers who ask, shrinks the interest line without touching your spending at all.
FAQ
Snowball vs avalanche — which saves more?
Avalanche (highest APR first) always saves the most interest; snowball (smallest balance first) closes accounts faster and keeps you motivated. Studies show snowball users are more likely to finish.
What if it says 'never clears'?
Your budget is below the monthly interest accruing on your debts. No payoff plan works at that point — increase income, negotiate APRs, or seek a credit counselor before optimizing order.
How much does avalanche really save over snowball?
Usually less than people expect, because both methods apply the same total budget. On the sample debts pre-loaded in this calculator, roughly $5,200 at 21.9 percent, $3,200 at 14.5 percent and $11,500 at 6.5 percent with a $1,000 monthly budget, snowball and avalanche both finish in about 22 months, but avalanche pays around $134 less interest, about 8 percent cheaper. The gap widens when high-rate balances are large relative to small ones, and nearly vanishes when APRs cluster together. The honest framing: avalanche is the mathematically optimal order, snowball is the behaviorally safer one, and the difference between them is typically a few hundred dollars, while the difference between either method and minimum-only payments is thousands. Choose the order you will actually complete.
Should a 0 percent balance transfer card be part of the plan?
It can accelerate the payoff if, and only if, the balance clears within the intro window, which runs 12 to 21 months on typical 2026 offers. Move the highest-APR balance first: shifting $5,000 from 21.9 percent to 0 percent saves about $92 per month of interest, all of which becomes principal reduction. Account for the 3 to 5 percent transfer fee, $150 to $250 on that balance, and avoid new purchases on the transfer card, which often accrue interest immediately. Model the plan twice here: once with the card APR at zero and once unchanged, and check that the fee-adjusted savings are real. If the intro period will not cover the balance, the transfer only postpones the same interest, and a fixed payment plan on the existing card is simpler and just as effective.
Do debts fall off my credit report before they are paid off?
Timing depends on status. Accounts paid as agreed stay on the report for up to ten years from opening and simply age into less influence. Late payments and collections remain seven years from the first delinquency date, whether or not you pay them, though a paid collection hurts less than an unpaid one in modern scoring models. Paying a charged-off account does not restart or shorten the seven-year clock. This means payoff order should follow interest cost, not report timing: a 21.9 percent card is worth attacking first even if a collection from four years ago will drop off sooner. One exception worth modeling: an unpaid collection can block mortgage approval regardless of age, so if a home purchase is within two years, ask your loan officer which items must be settled and prioritize those lines in the budget.