Plain Finance

Debt Payoff Calculator

List everything you owe and see when you would be free of it — under both the avalanche and snowball methods, with the real cost difference between them rather than an argument about which is better.

Your debts

What you can pay

Minimums total $900.00 · $300.00 extra

Debt-free in

3 years, 9 months

paying $1,200.00 a month

choosing the cheaper order saves $628

Avalanche or snowball?

Avalanche — highest rate first

Debt-free in
3 years, 9 months
Total interest
$6,937.79
First debt gone
1 year, 9 months

Always the cheapest. Never the fastest to a first win.

Snowball — smallest balance first

Debt-free in
3 years, 10 months
Total interest
$7,566.14
First debt gone
6 months

Costs more. Clears an account far sooner.

The actual difference

$628

is all that avalanche saves over snowball, plus 1 month. In exchange, snowball clears your first debt 1 year, 3 months sooner. Pick the one you will actually finish.

The order you would clear them

Avalanche

  1. Credit card 1 year, 9 months
  2. Medical bill 2 years
  3. Car loan 2 years, 6 months
  4. Student loan 3 years, 9 months

Snowball

  1. Medical bill 6 months
  2. Credit card 1 year, 11 months
  3. Car loan 2 years, 7 months
  4. Student loan 3 years, 10 months

Total debt over time

Both strategies trace almost the same path — which is the point. The order matters far less than the amount you put in every month.

  • Snowball
  • Avalanche

How both methods work

The mechanics are identical and simpler than the debate around them suggests. You pay the minimum on every debt, without exception, because missing one triggers fees and damages your credit. Then everything you can spare beyond those minimums goes to a single target debt.

When that target clears, two things happen at once: the spare money is still spare, and the cleared debt's minimum payment is now free too. Both roll onto the next target. That is why payoff accelerates — the first debt is the slowest, and the last one falls surprisingly fast despite usually being the largest.

The only decision is which debt to target first:

  • Avalanche targets the highest interest rate. Because interest is what makes debt expensive, killing the most expensive debt first always produces the lowest total cost. It is mathematically optimal, without exception.
  • Snowball targets the smallest balance. It costs more, but it removes an entire account from your life much sooner.

The gap is smaller than the argument

This question generates a remarkable amount of heat for something so easily measured. So measure it. On the example loaded above — $46,500 spread across a medical bill, a credit card, a car loan and a student loan, paying $1,200 a month:

  • Avalanche: debt-free in 45 months, $6,938 in interest.
  • Snowball: debt-free in 46 months, $7,566 in interest.

Avalanche wins by $628 and one month. On $53,000 of total repayments over almost four years, that is a difference of roughly 1%. It is real, and if the choice were free you should obviously take it. But it is not the decisive margin the internet argues about, and it is nowhere near large enough to justify choosing a method you will abandon.

What snowball buys with that $628 is visible: the first debt disappears at month 6 instead of month 21. Fifteen months earlier. If that is the difference between sticking with a plan and giving up on it, it is cheap at the price.

A wrinkle that weakens the usual argument

Snowball is normally defended on the grounds that avalanche gives you no early wins. Look closely at the payoff order above and you will see that is not quite true.

Under avalanche, the $2,400 medical bill is the last debt the strategy would ever target — it charges 0% interest, so it sits at the bottom of the priority list. It still clears at month 24, because its $100 minimum payment never stopped. Minimums keep paying down every debt in the background regardless of what you are targeting, so small debts tend to fall away on their own even under avalanche.

The early-wins advantage is therefore real but narrower than usually claimed: snowball accelerates a win you would mostly have got anyway. Whether fifteen months of waiting is worth $628 is a question about you, not about arithmetic.

What actually moves the needle

Neither strategy. The monthly amount. On the same example, raising the payment from $1,200 to $1,400 saves far more than choosing the optimal order ever could, and it does so under either method. If you want to be debt-free sooner, the productive question is not "which order" but "how do I find another $100 a month".

Other things worth doing before optimising the order:

  • Ask for a lower rate. Calling a card issuer and asking for a reduction works more often than people expect, and takes ten minutes.
  • Look at a 0% balance transfer — but only with a concrete plan to clear it before the promotional rate ends, and with the transfer fee counted.
  • Keep the employer retirement match. Do not stop contributing enough to get it in order to pay debt faster; a 50–100% instant return beats any interest rate you are carrying.
  • Stop adding to the balances. Obvious, routinely ignored, and it defeats every strategy here.

What this calculator assumes

Fixed interest rates, fixed minimum payments, no new borrowing, and payments applied monthly. Real credit card minimums are typically a percentage of the balance and shrink as you pay down, which makes a fixed minimum slightly optimistic — though the difference is small once you are paying more than the minimum, which is the whole point of using this. It does not model late fees, promotional rates expiring, or debt in collections, and it is not a substitute for advice if you are behind on payments. A non-profit credit counsellor is free and is the right call in that situation.

Frequently asked questions

What is the difference between the avalanche and snowball methods?

Both pay the minimum on every debt and throw everything spare at one target. They differ only in which target. Avalanche picks the highest interest rate, which always costs the least in total. Snowball picks the smallest balance, which clears individual accounts sooner. Whichever you choose, each debt you clear frees up its minimum payment, and that money rolls onto the next target — so the pace accelerates as you go. That rolling effect is where the name snowball comes from, but both methods use it.

Which one should I actually use?

Run your own numbers above before deciding, because the gap is usually much smaller than the strength of the argument suggests. On the example loaded here — $46,500 across four debts, paying $1,200 a month — avalanche saves $628 and finishes one month sooner. That is real money, but it is about 1% of the total repaid, spread over nearly four years. If seeing an account disappear at month 6 rather than month 21 is what keeps you going, snowball is very likely the better choice for you despite costing more. The strategy you finish beats the strategy that is optimal on paper.

Is there evidence that snowball works better?

There is research on consumer repayment suggesting that closing individual accounts early is associated with a greater likelihood of eliminating debt overall — the visible progress appears to sustain motivation in a way that a slowly falling total does not. That does not make snowball cheaper, and it never will be. It means the cheapest method on a spreadsheet is not automatically the one that gets you to zero, and the honest answer depends on how you personally respond to progress.

What if I cannot afford more than the minimum payments?

Then the order barely matters, because there is nothing spare to direct anywhere — every debt simply runs its own course. The calculator will still show you the timeline. The lever that actually changes the outcome is the monthly amount, not the sequence: try raising the total by $50 and watch how much the payoff date moves. If the minimums themselves are unaffordable, or if interest is outpacing what you can pay, that is a situation for a non-profit credit counsellor rather than a calculator.

Should I clear debt or build an emergency fund first?

Usually a small emergency fund first, then debt, then a larger fund. Without any buffer the next unexpected expense goes straight back onto a credit card, which undoes your progress and is demoralising in a way that sets people back further than the arithmetic suggests. A common approach is to hold around $1,000 to one month of expenses while attacking debt, then build to three to six months once the high-interest balances are gone. If your employer matches retirement contributions, capture that match throughout — it is a guaranteed return no interest rate competes with.

Does this calculator handle credit cards correctly?

It models a fixed minimum payment, which is how most people budget, but real card minimums are usually a percentage of the balance and therefore shrink as you pay down. Since a shrinking minimum makes payoff slower, entering your current minimum as a fixed amount is the slightly optimistic assumption — though it makes little difference once you are paying more than the minimum, which is the entire premise of using this tool. It also assumes you stop adding new charges.

Does the order I choose affect my credit score?

Only indirectly. Scores respond strongly to credit utilisation — how much of your available revolving credit you are using — so paying down credit cards tends to help more than paying down instalment loans like a car or student loan. That is a mild argument for targeting cards first, which usually aligns with avalanche anyway since cards typically carry the highest rates. Closing a card after paying it off can actually reduce your available credit and nudge utilisation up, so paying it off and leaving it open is generally the better move.