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Debt Payoff Calculator — Avalanche vs. Snowball, Compared

Paying off several debts at once? Enter each balance, APR, and minimum payment plus the total you can put toward debt each month, and this calculator compares the two proven strategies — avalanche (highest APR first) and snowball (smallest balance first) — so you can see the payoff order, the months to debt-free, and exactly how much interest each one saves.

Your debts

Debt 1
$

%

$

Debt 2
$

%

$

Debt 3
$

%

$

$

The total you can put toward all debts each month.

Results

Avalanche saves$1,317.01

Avalanche · highest APR first

Debt-free in29 months (2 yr 5 mo)
Total interest$3,640.53

Order: Debt 1 → Debt 2 → Debt 3

Snowball · smallest balance first

Debt-free in31 months (2 yr 7 mo)
Total interest$4,957.54

Order: Debt 3 → Debt 2 → Debt 1

The avalanche method pays $1,317.01 less interest and finishes 2 months sooner on these debts.

When you owe several debts at once, the question isn’t just “what’s my payment?” — it’s which debt do I attack first, and what does that choice cost me? This calculator answers that. You list every debt and the single total amount you can put toward debt each month, and it simulates the two proven payoff strategies side by side so you can see the real difference in time and interest.

The two strategies

Both methods pay the minimum on every debt, then throw whatever budget is left at one target debt until it’s gone. They differ only in how they pick that target:

  • Avalanche targets the highest-APR debt first. Because it kills your most expensive interest soonest, it always pays the least interest and clears everything fastest.
  • Snowball targets the smallest balance first. You eliminate whole debts quickly, which builds momentum — a motivational edge that helps many people actually finish.

The rollover effect (why a fixed budget is so powerful)

The magic is in what happens when a debt clears. The minimum payment it used to swallow is freed up, and because you keep your total budget the same, that money rolls over onto the next target on top of its own payment. Each payoff makes the next one faster, and the next faster still. This compounding snowball is why a steady monthly budget clears a stack of debts far sooner than paying each one in isolation — and it’s exactly what the month-by-month math here models.

A worked example

The calculator’s defaults show three debts paid from a $700/month budget:

Debt Balance APR Minimum
Debt 1 — Credit card $9,000 24.9% $220
Debt 2 — Personal loan $5,000 11.0% $130
Debt 3 — Car loan $2,500 5.5% $90

The minimums add up to $440, leaving $260 a month for the target debt.

  • Avalanche attacks the 24.9% credit card first, then the personal loan, then the car loan (order: Debt 1 → Debt 2 → Debt 3). You’re debt-free in 29 months and pay about $3,641 in interest.
  • Snowball attacks the $2,500 car loan first, then the personal loan, then the credit card (order: Debt 3 → Debt 2 → Debt 1). You’re debt-free in 31 months and pay about $4,958 in interest.

Same debts, same budget — but here the avalanche saves about $1,317 in interest and finishes 2 months sooner, simply by clearing the highest rate first. Raise the budget and both numbers fall even faster, because every extra dollar above the minimums goes straight to principal.

When the budget is too low

If your total budget is no larger than the combined interest your debts charge in a month, the balances never shrink — the debt is mathematically never paid off. The calculator detects that and tells you the minimum budget you need to exceed before any progress is possible, instead of pretending a payoff date exists. The fix is to free up more budget, lower a rate through a balance transfer or a consolidation loan, or both.

Tips to pay off faster

  • Pick an order and stick to it. Avalanche is cheapest; snowball is most motivating. The best plan is the one you’ll actually follow.
  • Hold the budget steady as debts clear. Don’t reclaim the freed-up payments — let them roll over. That’s where the speed comes from.
  • Lower a rate. Consolidating high-APR balances into one lower-rate loan, or moving them to a 0% balance-transfer card, shrinks the interest you enter here. Model both versions to compare.

Estimates are for planning only and assume fixed minimums, constant APRs, and no new charges or fees; real lender terms vary. Your statements are authoritative — see our disclaimer.

Frequently asked questions

What is the difference between the debt avalanche and debt snowball methods?
Both pay every debt’s minimum and throw all spare money at one target debt, but they pick the target differently. The avalanche method targets the highest-APR debt first, which mathematically saves the most interest and clears your debts soonest. The snowball method targets the smallest balance first, so you eliminate whole debts quickly and get an early motivational win. This calculator runs both on your numbers so you can see the trade-off in dollars and months.
How does paying off one debt speed up the rest (the rollover effect)?
When a debt is cleared, the minimum payment it used to absorb is freed up. Because you keep your total monthly budget the same, that freed-up money rolls onto the next target debt on top of its own payment — so each payoff makes the next one faster. This compounding "rollover" is why a fixed budget clears multiple debts far quicker than paying each one in isolation, and it is exactly what the month-by-month simulation here models.
Which debt should I pay off first?
If your goal is to pay the least interest and be done fastest, attack the highest-APR debt first (avalanche). If you need momentum and want to see debts disappear, attack the smallest balance first (snowball). For many people the interest difference is modest and the snowball’s psychological wins keep them going — but enter your real numbers above to see the actual gap, then choose the order you’ll stick with.
Is debt consolidation better than following a payoff strategy?
Consolidating several balances into one lower-rate personal loan or balance transfer can cut the APR you pay and simplify payments to a single bill — useful if you qualify for a meaningfully lower rate. But it only helps if you avoid running the old cards back up and the fees don’t erase the savings. Use this tool to model your current debts, then compare the total interest against a consolidation quote before deciding.
What if my budget barely covers the minimum payments?
If your total budget is no more than the combined interest your debts charge in a month, the balances never shrink and the debt is mathematically never paid off — this calculator flags that and tells you the minimum budget you must exceed to start making progress. The fix is to raise the budget, lower a rate (a balance transfer or consolidation loan), or both. Even a small amount above the interest line starts moving the balance down.

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