Multi-Card Debt Payoff Calculator: Snowball vs. Avalanche
Add every card you're carrying a balance on and see, side by side, which order of payoff — smallest balance first or highest APR first — saves you more.
Updated · Published · Built by Ali Ahmad, Founder
Calculation method: This calculator uses a simplified monthly-interest model (APR ÷ 12). Credit-card issuers may calculate interest using daily periodic rates and average daily balances, so your actual statement may differ. See our methodology.
Multi-Card Debt Payoff Calculator (Snowball vs. Avalanche)
The debt avalanche method (highest APR first) usually minimizes total interest. The debt snowball method (smallest balance first) often feels easier to stick with because it delivers quick wins. The calculator above runs both against your cards so you can compare estimated time and interest.
If you're carrying balances on more than one card, the order you pay them off in can change your total cost by hundreds or thousands of dollars. This calculator runs the two most popular strategies against your own cards.
How the Calculator Works
Enter each card's balance, APR, and minimum payment, plus one extra amount you can put toward debt each month. For both strategies, the calculator simulates each month in the same order:
- Interest is added to every open card (APR ÷ 12).
- The minimum payment is paid on every open card.
- Everything left of your monthly budget goes to one target card: the smallest balance (snowball) or the highest APR (avalanche).
- When a card reaches zero, its old minimum “rolls over” to the next target, because your total monthly budget (all starting minimums + extra) stays the same.
It reports total months, total interest, and the order and month each card is paid off.
By default each card's minimum stays the same every month. Set Minimum payments to “Shrink as each balance falls” to model minimums the way your statement recalculates them: each card keeps the same share of its balance it has today (for example, $95 on $4,500 is 2.11%), never below the dollar floor you set. Your extra amount stays the same, and a paid-off card's last minimum still rolls to the next target.
Formula
Each open card: Balance = Balance + Balance × (APR ÷ 12) − Minimum
Target card(s): Balance = Balance − (Budget − minimums paid this month)
Snowball target = lowest balance | Avalanche target = highest APR (ties: the order you entered the cards)
This is a simplified estimate, not an issuer-specific statement calculation. If the budget left over is more than the target card owes, the rest goes to the next target in the same month.
Example: three cards with $200 extra a month
| Card | Balance | APR | Minimum |
|---|---|---|---|
| Card 1 | $1,200 | 19.99% | $35 |
| Card 2 | $4,500 | 26.99% | $95 |
| Card 3 | $2,300 | 22.99% | $55 |
| Strategy | Payoff order (month paid off) | Total months | Total interest |
|---|---|---|---|
| Snowball | Card 1 (month 6), Card 3 (month 14), Card 2 (month 28) | 28 | $2,735.25 |
| Avalanche | Card 2 (month 19), Card 3 (month 26), Card 1 (month 28) | 28 | $2,446.97 |
Both methods finish in month 28, but the avalanche saves about $288 in interest because the extra money attacks the 26.99% card first. The snowball clears Card 1 in month 6, which is the quick win many people find motivating.
Fixed vs. Shrinking Minimums
If you pay only what each statement asks for plus the same $200 extra, the minimums fall as the balances do, so you pay less each month and the plan takes longer. With a $25 floor, the same three cards take 34 months by snowball and 35 by avalanche:
| Strategy | Minimums | Total months | Total interest |
|---|---|---|---|
| Snowball | Fixed | 28 | $2,735.25 |
| Snowball | Shrinking | 34 | $3,096.41 |
| Avalanche | Fixed | 28 | $2,446.97 |
| Avalanche | Shrinking | 35 | $2,901.67 |
Keeping your payments at today's minimums, even as the statements ask for less, is worth about $360 to $455 in interest here and gets you debt-free six or seven months sooner. The avalanche still costs less either way.
Which One Should You Use?
If the interest difference for your cards is small, pick the method you're most likely to stick with — a plan you abandon saves nothing. If the avalanche saves a meaningful amount, it's usually worth the extra discipline.
When the Result May Differ
Treat the results as a planning estimate. Your real numbers can differ because of:
- Daily periodic rate: many issuers apply APR ÷ 365 (or 360) each day instead of APR ÷ 12 once a month, which can produce different interest.
- Average daily balance: your balance moves during the cycle as purchases post and payments arrive; this calculator uses a single month-start balance.
- Fees: annual, late, foreign-transaction, cash-advance, and balance-transfer fees aren't included unless the calculator asks for them.
- New purchases: the estimate assumes you stop adding charges. Any new spending lengthens payoff and raises interest.
- Different APR categories: purchases, balance transfers, cash advances, and penalty APRs can carry different rates on the same card, and how payments are allocated between them affects the total.
- Not keeping the budget fixed: the estimate assumes you keep paying the same total each month after a card is cleared. Spending the freed-up money instead slows both methods down.
- Changing minimums: real minimum payments usually fall as balances fall. The fixed setting keeps each card's minimum the same; the shrinking setting uses a simple share of the balance with a floor, while your card's actual formula (often interest plus 1% of the balance) is in your cardholder agreement.
- Promotional rates: a card with a 0% promo would change which card the avalanche targets.
Your statement and cardholder agreement are the final word. See our methodology for how every calculator on this site works.
Before You Start Either Plan
Check whether a lower rate could beat both strategies outright with the Balance Transfer Calculator or the Debt Consolidation vs. Balance Transfer Calculator.
Frequently Asked Questions
What's the difference between the debt snowball and debt avalanche methods?
Both pay the minimum on every card and put extra money toward one target card. The snowball targets the smallest balance first, for quick wins; the avalanche targets the highest APR first, which usually minimizes total interest.
Which method is faster?
It depends on your cards. The avalanche usually costs less in interest and is often faster in total, but the snowball clears individual cards sooner. Enter your own cards above to compare both.
Can I combine both methods?
Yes — a common hybrid is to pay off any very small balances first for a quick win, then switch to avalanche order (highest APR first) for the rest.
What happens when a card is paid off?
Its old minimum payment rolls over to the next target card. The calculator keeps your total monthly budget (all starting minimums plus your extra amount) the same every month, so each paid-off card speeds up the next one — the standard way both methods work.
Should I close cards after paying them off?
Not necessarily. Closing a card removes its credit limit, which can raise your utilization, and eventually its history. If the card has no annual fee, many people keep it open and unused.
Does this calculator include new purchases or fees?
No. It assumes no new charges or fees, and new spending would lengthen the plan. Minimums stay fixed by default; switch "Minimum payments" to "Shrink as each balance falls" to model minimums that fall with each balance, down to a dollar floor.
This calculator provides estimates for educational purposes only and is not financial, tax, or legal advice. Most results use a simplified monthly-interest model (APR ÷ 12); your card issuer may use a daily periodic rate and average daily balance, plus its own fees and grace period rules, so your actual figures may differ — always confirm against your official statement.
Sources
- Regulation Z § 1026.53 – payments above the minimum go to the highest-APR balance first — Consumer Financial Protection Bureau. Checked September 25, 2026.