Snowball versus avalanche in one sentence
The debt snowball attacks the smallest balance first while you keep paying minimums on everything else. The debt avalanche attacks the highest APR first. Both use the same total cash each month; they only change the order. Avalanche usually saves more interest. Snowball often feels faster because accounts disappear sooner.
US revolving balances remain elevated into late 2026. LendingTree’s mid-year consumer credit research put outstanding credit-card debt around $1.263 trillion in Q2 2026. Whether your share is a few thousand dollars or tens of thousands, the order you attack balances changes how much interest you burn before the last statement zeros out.
How this calculator works
Add each debt with its balance, APR and contractual minimum. Enter any extra amount you can put toward debt after those minimums. Choose snowball, avalanche, or compare both side by side. Each month the tool accrues interest with standard monthly compounding (APR ÷ 12), pays every minimum, then pours leftover cash into the focus debt. When a debt clears, its minimum rolls into the next target automatically. Schedules stop at 600 months; if payments cannot cover interest, the tool says so instead of pretending the debt vanishes.
Numbers stay in your browser. We do not store balances, APRs or names. Do not paste account numbers or Social Security numbers into any field.
When snowball is the better behavioural fit
If unfinished debts drain your motivation, clearing a $600 store card in two months can keep you paying the plan. Behavioural finance research and nonprofit counselors often emphasise early wins. The interest “penalty” versus avalanche is sometimes only a few hundred dollars on modest balances — less than the cost of quitting and returning to minimums.
Snowball also simplifies mental accounting when you have many small medical or store balances mixed with one large card. Just remember: after the small wins, keep the same total payment. Shrinking the payment when a card dies is how people stall.
When avalanche is the cheaper math
If you can stick with a plan without needing quick closures, sort by APR. A 27% store card should usually die before a 9% personal loan even if the loan balance is smaller. Over multi-year payoffs with five-figure revolving debt, avalanche’s interest savings can reach thousands of dollars.
Hybrid approaches exist: knock out one tiny balance for a win, then switch to APR order. Model both in the compare toggle before you commit.
Minimums, extras and “good debt”
Always protect required minimums — missing them damages credit and triggers penalty APRs. Extra payment belongs only after rent, groceries, insurance and a small emergency buffer. Mortgage or federal student loans at comparatively low fixed rates are not always the first target if a 24% card is on fire; this tool is for consumer debts you choose to accelerate.
Balance transfers and personal consolidation loans can change the APR inputs mid-plan. Update the rows when a transfer promo ends or a loan funds. See our guides on snowball vs avalanche, balance-transfer math and personal-loan consolidation.
Limits of this model
We ignore late fees, penalty APR hikes, deferred interest (common on store cards), variable-rate resets and creditor-specific payoff quoting rules. Amortizing installment loans with fixed schedules are approximated by treating your stated minimum as constant; confirm with your amortisation schedule. Educational arithmetic only — not credit advice, not a lending offer.
Privacy and honesty
Calculations run locally in your browser on DebtClear. We do not need an account and we do not receive the numbers you type. Advertisers help keep the tools free; ads are labelled. Affiliate links, when present, use rel="sponsored" and are described in the affiliate disclosure.
This site is not a lender, debt settler or credit counselor. Results are estimates. Confirm APRs, fees and payoff quotes with your issuer. For complaints or collection rights, start with consumerfinance.gov and ftc.gov.