Debt Snowball & Avalanche Calculator (Payoff Planner)
Build a debt payoff plan: snowball or avalanche order, months to debt-free, total interest, debt-free date, and savings versus minimum payments only.
Debt Snowball — interactive calculator, computed instantly in your browser.
Debt Snowball vs Avalanche: Choosing a Payoff Order That Sticks
Two Orders, One Destination: Zero Balances
A debt snowball clears your smallest balance first; an avalanche clears your highest interest rate first. Both share the engine: keep paying minimums on everything, throw an extra lump at one target, then roll that target's entire payment onto the next debt like a growing snowball. The order changes psychology versus arithmetic — this calculator runs both plans side by side so you can pick with open eyes.
1. The Mechanics of a Payoff Plan
- Interest accrues each month: balance × APR ÷ 12 — a $2,500 card at19.99% costs about $41.66 the first month alone
- Pay all minimums, then aim the extra at your target debt until it hits zero
- The month a debt dies, its minimum joins the attack budget permanently — payments compound the same way interest does, in your favor
- Our worked example adds only $100/month beyond minimums and still collapses the timeline dramatically versus minimum-only
2. Avalanche Saves Interest, Snowball Saves Momentum
The avalanche is mathematically optimal: highest-APR debt accrues interest fastest, so killing it first minimizes total interest — usually by a few hundred to a few thousand dollars on mid-size debt loads. The snowball trades that margin for early wins: small balances vanish in the first months, and behavioural research (and Dave Ramsey's audience of millions) argues the momentum is what keeps people from quitting at month nine. If your smallest debt is also near your highest rate, both orders converge anyway.
3. Why Minimum-Only Never Ends
- Credit-card minimums are typically 1%–3% of the balance plus interest — early payments barely dent principal, so a $5,000 card can take decades at the minimum
- If a debt's minimum is lower than its monthly interest, the balance grows forever — the calculator flags these "impossible" debts outright
- Levers that accelerate either plan: negotiate a lower APR, a0% balance transfer (mind the transfer fee), or consolidate a high-rate balance into a lower-rate loan
- Keep the plan honest: freeze the cards, automate the extra payment on payday, and re-run this calculator with real balances every quarter
🔗 Debt Payoff Cross-References
Avalanche minimizes interest on paper while snowball buys quick wins — map every balance against the 💰 Financial Hub and keep all your cards in a single plan.
Large minimum payments inflate your debt-to-income ratio; once balances clear, re-check borrowing room with the DTI calculator below.
Frequently Asked Questions (Debt Snowball)
Snowball targets the smallest balance first for quick psychological wins; avalanche targets the highest interest rate first to minimize total interest. Both roll each freed minimum payment onto the next debt — only the attack order differs, never the total monthly outlay.
Avalanche, almost always — paying high-interest balances first reduces compounding. The gap depends on rate spread: with cards at24%,19%, and7%, expect avalanche to win by months of interest. If the spread is under2%, pick whichever order you will actually follow.
Every extra dollar goes straight to principal on the target debt, cutting its remaining interest and letting the rolled payment reach the next debt sooner. The savings are superlinear — modest extras like $100/month routinely remove a year or more from the schedule.
Minimums are sized to cover mostly interest early on, so principal shrinks at a crawl while interest reaccrues on the full balance. A debt whose minimum no longer exceeds its monthly interest never ends at all — increase the payment or stop borrowing against it.