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Debt Payoff Comparison Calculator

Snowball or avalanche? Stop debating it in the abstract. Enter your real balances, APRs, and minimums, and this calculator runs both payoff plans month by month — then shows you the winner in dollars, months, and the exact order each debt gets cleared.

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Your debts, both strategies, one winner

List up to four debts — balance, APR, and the minimum you actually pay — plus one extra amount you can throw at debt each month. The calculator runs the avalanche (highest APR first) and the snowball (smallest balance first) side by side with the same monthly budget.

On top of all minimums — aimed at the current target.

Debt 1
Debt 2
Debt 3
Debt 4 (optional)
Winner: avalanche$188 less interestThe avalanche clears everything in 2y 5m vs 2y 5m for the snowball — same $460.00/mo budget.
Total interest · avalanche$2,692Cheapest
Total interest · snowball$2,880Cheapest
Payoff time · avalanche2y 5mFastest
Payoff time · snowball2y 5mFastest

Avalanche payoff order

Highest APR first — the mathematically cheapest sequence.

Snowball payoff order

Smallest balance first — the fastest early wins.

How it works: each month, interest (balance × APR ÷ 12) lands on every open debt first. Your minimums go next. Then your extra payment — plus the minimums freed up by debts you already cleared — cascades onto the current target: the highest-APR debt for the avalanche, the smallest-balance debt for the snowball. When a target dies, everything rolls to the next. Both plans spend the same monthly budget, so the difference is pure strategy.

How debt payoff math works

The snowball and the avalanche are not two philosophies of life — they are two orderings of the same money. Every month you spend the same total: all the minimums plus your extra. The only choice is which debt the extra attacks first.

The formulas

monthly interest = balance × APR ÷ 12 · avalanche target = highest APR · snowball target = smallest balance · when a target is cleared, its minimum joins the extra payment and rolls to the next target

The avalanche is provably the cheapest: every extra dollar kills the most expensive interest first. The snowball is the fastest to a first victory: killing a small balance early frees its minimum sooner and gives you a win to build on. The calculator runs both so you can see the real trade-off for your debts, not an average person's.

Worked example: $10,300 across three cards

The setup: Store card $1,800 at 26.99% ($50 min), Card A $2,500 at 14.99% ($60 min), Card B $6,000 at 21.99% ($150 min), plus a $200/month extra — a $460/month total budget.

Avalanche (highest APR first): Store card cleared in month 8, then Card B in month 25, then Card A in month 29. Total interest $2,692.03, debt-free in 2 years 5 months.

Snowball (smallest balance first): Store card in month 8, then Card A in month 16, then Card B in month 29. Total interest $2,879.67, debt-free in 2 years 5 months. The avalanche saves $187.64; the snowball kills two debts by month 16 instead of one. Neither is wrong — now you know the price of each.

When the math breaks

If your minimums plus the extra payment don't beat one month's total interest, the balances grow instead of shrinking — the calculator tells you plainly instead of spinning forever. Fix it by raising a payment, not by switching strategies: no ordering trick outruns interest that outpaces your payments.

Where this comes in handy

  • The full method, step by step: the snowball vs avalanche guide walks through the order math, the hybrid strategy, the minimums trap, and consolidation — with worked numbers.
  • One card's true cost: the credit card payoff calculator shows what minimum-only payments really cost on a single balance.
  • The extra-payment effect on any loan: the extra loan payment calculator shows how the same extra shrinks a fixed installment loan.
  • Sequencing by date: once you pick a strategy, the loan payoff date calculator pins your debt-free month for each remaining loan.
  • Your first safety net: keep a small cushion while you attack debt — the emergency fund calculator sizes it so a surprise bill doesn't land back on the cards.

Debt payoff comparison — frequently asked questions

Which method actually saves more money — snowball or avalanche?

The avalanche, always — given the same monthly budget. Every extra dollar aimed at the highest APR kills the most expensive interest first, so no other ordering of the same payments can cost less interest. The real question is how big the gap is: with a wide rate spread it can be hundreds or thousands of dollars; with similar rates on every card, the difference is pocket change.

When is the snowball the better choice, then?

When you need the win. Clearing a small balance in a few months frees its minimum payment and proves the plan works — and a plan you stick with beats a perfect plan you abandon. If the calculator shows the avalanche only saves you $40 on your debts, the snowball's early victories are worth more than $40 of math.

I got a lump sum — a tax refund or bonus. One debt or split it?

Put the whole thing on your current target under whichever plan you're following. Splitting it across balances dilutes the cascade: one dead debt frees its minimum for the next, while three slightly smaller debts free nothing. The one exception: if the lump sum can fully clear a small debt, take the quick win — a cleared debt is cleared.

What happens if I can only pay the minimums?

You stay in debt for years and pay thousands in interest. On the example above ($10,300 at these rates), minimums alone take 70 months — nearly 6 years — and cost $7,783 in interest versus $2,692 with a $200 extra. Run your own numbers with the extra set to $0 to see your personal minimums-only cost.

My 0% balance-transfer promo is expiring — which card gets the extra money?

Model the promo card as its own debt with its post-promo APR and its promo-end date in mind. The balance about to jump to the highest rate is usually the right target — interest that was $0 becomes 20%+ overnight. The avalanche logic still applies: aim at the rate the debt will carry, not the rate it carries today.

Can I start with the snowball and switch to the avalanche later?

Yes — the hybrid is a legitimate strategy, not cheating. Take the snowball's quick wins on your smallest balances to build momentum, then switch the extra payment to the highest APR once only bigger balances remain. Re-run the calculator with your updated balances to see the new orders.

Would a consolidation loan beat both strategies?

Sometimes. A personal loan at, say, 10% beats attacking 22–28% cards if three things hold: the new rate is well below your debts' weighted average, the fees don't erase the savings, and you freeze the freed-up cards instead of refilling them. It loses when the term stretches so long that a lower rate still costs more total interest, or when the cards get spent up again — then you have the loan and the cards.

Should I pay off debt or invest the extra money?

Compare the guaranteed return. Paying off a 24% card is a risk-free 24% return — the market won't reliably beat that. High-rate debt first is almost always the math answer. The common exception is an employer 401(k) match: that's an instant 50–100% return on your contribution, which beats even painful card rates.

Learn the method: the free snowball vs avalanche guide explains the order math step by step, when the gap barely matters, the hybrid play, the minimums-only trap, and when consolidation wins.

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