US Finance Tool
Credit Card Payoff Calculator — snowball vs avalanche
Put in every card you hold and what you can afford each month. This works the payoff month by month under both strategies — highest rate first, and smallest balance first — and tells you exactly what choosing the easier one costs. It also shows what paying only the minimums would do, which is usually the most persuasive number on the page.
- 💳 As many cards as you have
- ⚖️ Both strategies compared
- 🔁 Freed minimums rolled forward
- 🔒 Nothing leaves your browser
Your cards
Use the purchase APR from your statement, not a promotional rate.
Start from a common case
What you can pay
Minimum payment rule
How your issuer calculates the minimum. The modern rule always retires the balance; the flat rule can bill less than the interest at a high APR.
Your payoff
- Total balance
- —
- Weighted average APR
- —
- Total interest
- —
- Total repaid
- —
- Minimums due now
- —
- Interest accruing
- —this month, if nothing changes
Strategy comparison
| Strategy | Time | Interest | Total paid |
|---|
What you still owe, month by month
The gap between the two lines is what the ordering is worth. Both totals are in the table above.
Payoff order
Pay the minimum on everything; put every spare dollar on the card at the top.
| Card | APR | Balance | Interest paid | Cleared |
|---|
Not financial advice. This calculator produces estimates for planning from the figures you enter, assuming rates and minimums stay as entered and no new spending is added. It is not financial, credit or legal advice. Real cards vary: promotional rates expire, issuers change minimum formulas, and fees and penalty APRs are not modelled here. If you are struggling with payments, a non-profit credit counselling agency can help.
Avalanche is cheaper. Snowball is finished more often.
Both strategies do the same two things: pay the minimum on every card, and throw every spare dollar at exactly one of them. They differ only in which card gets the spare money.
The avalanche targets the highest APR. This is mathematically optimal — not usually, always. Interest accrues fastest on the highest rate, so removing that balance first removes the most future interest. No other ordering can beat it.
The snowball targets the smallest balance. It costs more, sometimes a little and sometimes a lot, but it clears an entire account sooner and gives you a finished thing to point at early on. That matters more than a spreadsheet suggests: a plan abandoned in month four returns nothing, and the research on debt repayment consistently finds that visible early wins keep people going.
The comparison table above puts a number on the trade. If snowball costs you sixty dollars, take the momentum. If it costs three thousand, the discipline is worth buying. Either way you are choosing with the actual figure in front of you rather than following whichever approach the last article you read happened to prefer.
Why minimum payments barely move the balance
The minimum payment is not designed to clear your debt. It is designed to cover the interest and shave a sliver off the principal, and to shrink as the balance shrinks so that the sliver gets smaller too.
Most US issuers now bill roughly the month's interest plus about 1% of the balance, subject to a floor of $25 to $35. That formula guarantees the balance falls — the interest is fully covered before the percentage is added — but only just. Run the minimums-only row in the comparison above against your own cards; the number of years is usually the thing that makes people change something.
The older flat percentage rule — a straight 2% of the balance, with no interest component — has a sharper problem. At 27.99% APR the monthly interest is 2.33% of the balance. A 2% minimum bills less than that, so the balance grows every month no matter how faithfully it is paid. Most major issuers abandoned this formula for exactly that reason, but some store cards still use it. Switch the minimum rule above to see the effect; any card where the minimum falls below the accruing interest is flagged in red.
The rollover is what actually gets you there
Both strategies are named for the same mechanism. When a card is cleared, the minimum you had been paying on it does not return to your pocket — it joins the money attacking the next card. Clear a second, and both minimums join. The amount hitting the final card is far larger than the amount that hit the first.
This is why the payoff dates in the results are much better than dividing your balance by your monthly payment would suggest, and it is why the order matters at all. It also explains the one discipline the whole plan depends on: when a card clears, that money has to be redirected rather than absorbed into normal spending. The calculator assumes you do this. If you would not, reduce your monthly budget to something you would genuinely sustain and run it again — a plan built on a number you will not hold to is not a plan.
Frequently asked questions
What is the difference between the debt snowball and the debt avalanche?
Both pay the minimum on every card and put every spare dollar on one target. They differ only in which card is the target. Avalanche picks the highest APR and is mathematically optimal — always the least interest and the fastest payoff. Snowball picks the smallest balance, clearing an account sooner for a visible early win. Avalanche wins on money; snowball wins on momentum.
Which strategy should I actually use?
Use the calculator to see what the choice costs on your cards. If the gap is small — common when the highest-rate card is also fairly small — take snowball and enjoy the early win. If it runs into thousands, avalanche is worth the discipline. The worst strategy is the one you abandon in month four.
Why does paying only the minimum take so long?
The minimum covers the interest plus a sliver of principal, and shrinks as the balance falls. Most US issuers bill roughly the interest plus 1% of the balance, with a $25–$35 floor. That guarantees the balance falls, but only just — a $6,000 balance at 21% takes well over a decade on minimums alone.
Can a minimum payment ever be less than the interest?
Under the older flat rule — a straight percentage with no interest component — yes. A 2% minimum against a 27.99% APR bills 2% while 2.33% accrues, so the balance grows no matter how long you pay. Most major issuers moved away from that formula for this reason, but some store cards still use it. The calculator flags any card where the minimum falls below the interest.
What is the rollover and why does it matter so much?
When a card is cleared, the minimum you were paying on it joins the money attacking the next card. That is what makes both strategies accelerate — each payoff makes the next faster. This calculator models it, which is why the results beat simply dividing your balance by your payment.
Should I use a balance transfer card?
A 0% transfer can save a lot, but only if you clear it before the promotional period ends and after the 3–5% transfer fee. To model one here, zero the old card, add a new card with the transferred balance plus the fee at 0% APR, and check whether your budget clears it inside the window. If not, work out what happens at the go-to rate first.
Does this affect my credit score?
Paying down balances lowers your credit utilisation, a significant scoring factor, so scores generally improve as balances fall. One nuance: closing a card after clearing it reduces your available credit and can raise utilisation on paper, which is why many people leave a cleared card open and unused. This calculator models the debt, not the score.
Is my information sent anywhere?
No. Every calculation runs in your browser. Your card names, balances and rates are saved only in your own browser's local storage so the page remembers them next visit, and clearing your site data removes them. Nothing about your finances is transmitted to ToolAdda.