Debt Snowball vs. Avalanche Calculator
Compare payoff time and interest for two repayment strategies.
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How this calculator works
Monthly interest = opening balance × APR ÷ 12. Both strategies pay every active minimum first, then target the remaining fixed monthly budget. Snowball targets the smallest opening balance; avalanche targets the highest APR. Freed payments roll forward and any excess continues to the next debt that month. Rates and minimums stay constant; no new debt, fees or rate promotions. Actual credit cards often use daily interest and changing minimums. Results keep full precision internally and round for display. Limit: 1,200 months.
Reference: CFPB: debt repayment strategies.
Source review: October 2, 2026. Planning estimate; individual terms and rules may differ.
Snowball vs. avalanche in one minute
Both methods pay the minimum on every debt and send every extra dollar to one target debt. When that debt is gone, its payment rolls over to the next target, so your total monthly payment stays the same while the number of debts shrinks.
- Debt snowball: target the smallest balance first. You clear whole debts sooner, which many people find motivating.
- Debt avalanche: target the highest interest rate first. This always costs the same or less interest.
Worked example: three debts and $150 extra
The example inputs are a $5,000 credit card at 24% ($150 minimum), a $2,000 personal loan at 8% ($100 minimum) and an $8,000 car loan at 6% ($250 minimum), with $150 a month extra, a total of $650 a month.
| Snowball | Avalanche | |
|---|---|---|
| First debt paid off | Personal loan, month 9 | Credit card, month 21 |
| Credit card paid off | Month 22 | Month 21 |
| All debts paid off | Month 27 | Month 27 |
| Total interest | $2,190.67 | $1,959.01 |
The avalanche saves $231.66 because it attacks the 24% card first. The snowball gives you a paid-off loan in month 9 instead of month 21. Both finish in the same month here because the extra payment is modest; with larger balance and rate differences the avalanche also finishes sooner.
The extra payment matters more than the method
Changing the extra amount moves the result far more than switching strategies:
| Extra per month | Snowball | Avalanche |
|---|---|---|
| $0 (minimums only) | 38 months, $3,604 interest | 37 months, $3,491 interest |
| $150 | 27 months, $2,191 interest | 27 months, $1,959 interest |
| $300 | 21 months, $1,619 interest | 21 months, $1,403 interest |
Going from no extra payment to $300 a month saves about $2,000 of interest and 17 months, while the choice of method is worth a little over $100 to $230 in this example.
Which method should you choose?
Choose the avalanche if your debts have very different interest rates, especially a high-rate credit card next to low-rate loans, and you are confident you will stick with the plan. Choose the snowball if you have several small balances, have struggled to stay motivated before, or simply want fewer bills to track. A practical hybrid is to clear any tiny balances first for quick wins, then switch to the highest rate. The best plan is the one you will follow every month.
Ways to lower the interest you pay
- Ask for a lower rate. A call to a credit card issuer with a record of on-time payments sometimes gets the APR reduced.
- Balance transfer cards. A 0% introductory offer can stop interest for 12 to 21 months, but transfer fees of about 3% to 5% are common and the rate jumps afterward. Pay the balance off before the promotion ends.
- Debt consolidation loans. A fixed-rate personal loan below your card rates can cut interest and give one payment. It only helps if you avoid running the cards back up.
- Nonprofit credit counseling. Accredited agencies can set up a debt management plan with reduced rates. The Consumer Financial Protection Bureau explains how to find a reputable one.
Compare options with our personal loan vs. credit card guide and credit card payoff calculator.
Finding money for the extra payment
Look at the money that arrives irregularly: the third paycheck in a biweekly month, a tax refund, a bonus or a raise. A large refund every year is also a sign you could change your W-4 and have more each paycheck; the W-4 withholding calculator shows how. Pair the plan with a small emergency fund so a car repair does not go back on a credit card.
How paying off debt affects your credit
Paying down credit cards lowers your credit utilization, the share of your card limits in use, which is one of the biggest factors in credit scores. Keep paid-off cards open unless they have an annual fee, because closing them reduces your available credit. Paying off an installment loan such as a car loan can cause a small temporary dip, but on-time payments and lower balances help over time. Learn more in our credit utilization guide.
Setting up your payoff plan
- List every debt with its balance, interest rate and minimum payment. Your statements or online accounts show all three.
- Choose a total monthly payment you can keep up every month: all minimums plus an extra amount from your budget.
- Pick a method and order your debts: smallest balance first for the snowball, highest rate first for the avalanche.
- Automate the minimums on every account so nothing is missed, then send the extra to the target debt each payday.
- Roll payments forward as each debt is paid off, and re-run the calculator every few months with current balances.
The first six months of the example
Under the avalanche plan with $650 a month, interest falls every month as balances shrink, so more of the same payment goes to principal:
| Month | Paid | Interest charged | Total balance left |
|---|---|---|---|
| 1 | $650 | $153.33 | $14,503.33 |
| 2 | $650 | $147.71 | $14,001.04 |
| 3 | $650 | $141.99 | $13,493.03 |
| 4 | $650 | $136.18 | $12,979.21 |
| 5 | $650 | $130.28 | $12,459.49 |
| 6 | $650 | $124.29 | $11,933.78 |
Interest drops from $153 in the first month to $124 by the sixth. Download the full schedule from the calculator to follow your own plan month by month.
How credit card minimum payments work
Card issuers usually set the minimum payment as a small percentage of the balance, often 1% to 3%, plus that month's interest and fees, or a fixed floor such as $25 to $40, whichever is higher. Because the minimum shrinks as the balance shrinks, paying only the minimum can stretch a card balance over many years. Your statement includes a minimum payment warning that shows how long payoff takes at the minimum and what payment would clear it in three years. This calculator holds each minimum fixed at the amount you enter, which pays debt off faster than a shrinking minimum would.
Staying motivated through a long payoff
- Track the total balance monthly, not just the target debt, so progress is visible even before a debt is paid off.
- Celebrate milestones cheaply, such as each paid-off account or every $1,000 of total debt removed.
- Send windfalls to the target debt: tax refunds, bonuses and the third paycheck in biweekly months shorten the plan quickly.
- Stop new borrowing. Remove saved cards from shopping sites and keep a small emergency fund so a surprise bill does not undo months of progress.
Key terms
- APR: the yearly interest rate on a debt. Monthly interest is roughly the balance times APR / 12.
- Minimum payment: the least you must pay each month to keep the account in good standing.
- Target debt: the one debt that receives all extra money until it is paid off.
- Rollover: adding a paid-off debt's payment to the next target, so the total monthly payment stays the same.
- Credit utilization: card balances divided by card limits, a major factor in credit scores.
Medical debt, collections and debts with no interest
Not every debt fits neatly into the snowball or avalanche order. Medical bills often carry no interest while they are with the provider, so the avalanche would put them last; ask the provider for an interest-free payment plan or financial assistance, which many hospitals must offer to eligible patients. Debts already in collection affect your credit differently: paying them may not remove the record, so get any agreement in writing before paying, and check whether the debt is old enough to be past your state's statute of limitations before you restart payments. Keep current on secured debts such as a car loan or mortgage first, because missing those can cost you the car or home, even if their interest rate is lower.
Settlement, hardship programs and bankruptcy
If even minimum payments are not affordable, talk to your lenders about hardship programs before accounts fall behind. Debt settlement companies negotiate to pay less than you owe, but they usually ask you to stop paying while they negotiate, which damages credit and can lead to collection actions, and forgiven debt of $600 or more is generally reported on Form 1099-C and may be taxable unless you were insolvent. Bankruptcy is a legal process with long-lasting credit effects and should be discussed with a qualified attorney. A nonprofit credit counselor can help you compare these options for free or at low cost.
Frequently asked questions
Which saves more, snowball or avalanche?
The avalanche, because it pays the highest interest rate first. In the example above it saves about $232 of interest.
Is the debt snowball a bad idea?
No. It usually costs a little more interest, but clearing small balances quickly helps many people stay on the plan, which matters more.
Should I include my mortgage?
Usually not. Most people focus on consumer debts such as credit cards, personal loans and car loans, and keep paying the mortgage as scheduled.
What happens when a debt is paid off?
Its minimum payment rolls into the payment on the next target debt, so your total monthly payment stays the same and later debts are paid off faster.
Should I stop saving to pay off debt faster?
Keep at least a small emergency fund, often $1,000 or one month of expenses, so a surprise bill does not go back on a credit card. Then put extra money toward debt.
Can I switch methods partway through?
Yes. Re-enter your current balances and run both methods again. Switching after clearing a few small debts is a common hybrid approach.
Does a balance transfer change the plan?
Enter the new card with its promotional rate and the transfer fee added to the balance. Plan to clear it before the promotion ends.
How long does it take to pay off $15,000 of debt?
It depends on rates and payments. In the example, $15,000 across three debts takes 27 months at $650 a month and 21 months at $800.