How to use this calculator
- Add each debt with its current balance, APR, and minimum payment. You can list up to 10 debts.
- Enter the total monthly budget you can put toward all of these debts combined, including every minimum payment.
- Choose Avalanche (highest interest rate first) or Snowball (smallest balance first) to see how your extra budget gets allocated.
- Review the debt-free date, total interest, and how both strategies compare to paying only the minimums.
- Open the payoff order table and timeline chart to see exactly when each debt disappears, then export the schedule or share your scenario.
How it's calculated
Each month, every debt accrues interest on its remaining balance at balance × APR ÷ 1200. Every debt first gets its minimum payment (capped at its remaining balance plus that month's interest, so you never overpay). Any budget left over — your minimum payments plus extra — is directed entirely at one debt at a time: the highest APR under avalanche, or the smallest balance under snowball.
Once that top-priority debt is paid off, the money that was going to it (its old minimum plus any extra) rolls onto the next debt in line the very next month — this "waterfall" is what makes both methods speed up over time.
The minimum payments only baseline runs the same simulation with no extra budget at all, so you can see exactly how much time and interest your extra payments save.
Debt avalanche always pays the same amount or less total interest than debt snowball for the same budget, because it targets the most expensive interest first. Debt snowball can still be the better real-world choice if clearing small balances quickly keeps you motivated to stick with the plan.
If your monthly budget is less than the sum of every minimum payment, the calculator pays what it can toward each debt in priority order and flags it — get current on your minimums, even a small amount extra, before optimizing for interest.
Assumptions
- APRs and minimum payments stay fixed for the life of the plan; in reality, card issuers can raise your rate or minimum, and promotional 0% periods expire.
- Your full budget is paid every month with no missed or late payments, and no new charges are added to any balance.
- Minimum payments are the dollar amounts you enter, not a percentage-of-balance formula that shrinks as the balance falls (use your statement's actual minimum for the most accurate result).
- This models payoff math only — it isn't a debt management plan, credit counseling, or negotiated settlement, and it doesn't affect your credit score or report.
- Results are estimates for planning. Confirm any extra payment is applied to principal (not held as a future payment) with your card issuer or lender.
Frequently asked questions
What's the difference between debt avalanche and debt snowball?
Debt avalanche puts every extra dollar toward the debt with the highest interest rate first, while paying the minimum on everything else. Debt snowball puts extra money toward the smallest balance first, regardless of its rate. Avalanche minimizes total interest paid; snowball clears individual debts faster, which many people find more motivating.
Which method pays off debt faster: avalanche or snowball?
With the same monthly budget, both methods take about the same total time to become completely debt-free, since the same extra money is applied each month either way. The difference is total interest cost (avalanche is equal to or lower) and the order individual debts disappear — snowball clears your first debt sooner, which can feel faster even when the finish line is the same.
What if my monthly budget is less than my total minimum payments?
The calculator flags this with a warning and pays as much of each debt's minimum as your budget allows, in priority order, rather than falling behind evenly on everything. If this happens to you, contact your lenders — many offer hardship programs — before you miss payments, which can trigger late fees and hurt your credit.
Can I combine credit cards, personal loans, and other debts in one plan?
Yes. Enter each one as its own row with its actual balance, APR, and minimum payment. The strategy works the same way regardless of debt type; only the payoff engine's interest math changes anything, and it's identical for cards and installment loans.
How is credit card interest actually calculated?
Card issuers charge interest daily on your average balance and post it monthly, which this calculator approximates with a monthly rate of APR ÷ 12 applied to your balance. Carrying a balance means you lose the grace period on new purchases too, so interest often starts accruing immediately rather than after a statement cycle.
Will paying more than the minimum hurt my credit score?
No — paying down balances faster generally helps your credit score by lowering your credit utilization (balances relative to your limits), one of the biggest scoring factors. Just keep making at least the minimum payment on every account, since a missed minimum elsewhere can hurt your score more than the extra payment helps.
What if I can't afford even the minimum payments on everything?
This calculator assumes you can cover all minimums plus, ideally, some extra. If you can't, prioritize never missing a payment (autopay for at least the minimum helps), and contact your card issuers directly — many will temporarily lower your rate or minimum through a hardship or forbearance program.
Should I pay off debt or save and invest first?
A common rule of thumb: build a small starter emergency fund, then aggressively pay off any debt with a rate higher than you could reliably earn investing (most credit cards clear that bar easily), then invest. If your employer matches retirement contributions, most planners suggest capturing at least the full match before extra debt payoff, since that match is an immediate, guaranteed return.
Does the order I list my debts in matter?
No. The calculator re-sorts your debts by APR (avalanche) or balance (snowball) automatically, so the order you type them in only affects display order, not the payoff simulation.
Why does the timeline chart show some balances flat before they start dropping fast?
Under both strategies, every debt still gets its minimum payment from month one, which is often barely more than that month's interest — so its balance falls slowly. Once higher-priority debts are paid off, the freed-up money rolls onto that debt and its balance starts falling much faster, which shows up as a steeper drop later in the chart.
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Disclaimer: This calculator provides estimates for educational purposes only and is not financial, tax, or legal advice or an offer of credit. Actual payments depend on your lender, loan terms, taxes, and insurance. Consult a qualified professional before making financial decisions.