How does the calculator roll payments down?
Your monthly budget is fixed at the total of all minimum payments plus the extra amount you enter. The calculator sorts the debts by interest rate from highest to lowest and keeps that budget constant until everything is paid.
Each month it adds interest to every open balance at its rate divided by 12, pays each debt's minimum, and sends the remainder of the budget to the highest-rate debt still open. Once that debt reaches zero, its minimum and the extra money no longer go there, so they roll down to the next rate in line. In the payoff month, any leftover dollars flow to the next target immediately.
For comparison, the calculator also projects each debt paid with only its own minimum and no rollover. The difference in total interest is the interest saved versus minimums. Minimums are treated as fixed dollar amounts, which matches installment loans; a credit card whose minimum shrinks would take even longer on its own.
Monthly budget = Σ minimum payments + extra payment Target = open debt with the highest interest rate Interest saved = Interest(minimums only) − Interest(roll-down)
- Σ minimum payments
- sum of the required minimums on all debts
- extra payment
- money paid above all minimums each month
- Target
- the debt that receives every dollar above the other minimums
Example: one expensive card and three cheaper debts
Scenario: Suppose you carry Card A ($9,500 at 27.24%, $285 minimum), Card B ($1,700 at 19.9%, $50), a car loan ($4,300 at 8.9%, $180) and a student loan ($2,100 at 4.5%, $60), and you can add $250 a month.
- Monthly budget$285 + $50 + $180 + $60 = $575 in minimums, plus $250 = $825 a month
- Order by rateCard A 27.24% → Card B 19.9% → car loan 8.9% → student loan 4.5%
- Attack the top rateCard A gets $285 + $250 = $535 a month against about $215.65 of first-month interest; it is paid off in month 23
- Roll downBy then the other debts have been shrinking on their minimums; with Card A's money rolled down, Card B clears in month 25, the car loan in month 26 and the student loan in month 27
- Total costDebt-free in 27 months with $3,959.69 of interest, against $9,873.63 and 63 months on minimums alone
- Interest saved vs minimums$9,873.63 − $3,959.69 = $5,913.94
The avalanche clears all four debts in 2 years 3 months and costs $3,959.69 in interest, $977.02 less than the snowball order on the same budget.
Rates on cards are often variable, so if one rate changes enough to reorder the list, re-run the plan with the new figures.
When is the avalanche the right tool?
A large balance carries your highest rate
This is where the avalanche shines. Targeting the costly balance first stops the biggest source of interest instead of letting it compound while smaller debts are cleared.
You are motivated by numbers
If watching total interest fall keeps you going as well as closing accounts does, the avalanche gives you the lowest-cost route without sacrificing follow-through.
Your rates vary widely
When rates range from single digits to the high twenties, the order matters a lot. The wider the spread, the more the avalanche tends to save.
You are comparing payoff plans
Run the same debts through this calculator and the debt snowball calculator. The difference in total interest is the price of the snowball's quicker early wins, which helps you choose deliberately.
What mistakes weaken an avalanche plan?
Ranking by monthly interest instead of rate
The order is set by the interest rate, not by which debt costs the most dollars this month. A large low-rate loan can accrue more dollars of interest, but paying it first saves less per dollar.
Giving up before the first payoff
If the top-rate debt is also large, months can pass before an account closes. Tracking the falling balance and total interest helps bridge that gap.
Forgetting promotional rates
A card on a temporary low rate looks cheap now but may jump later. Rank it by the rate that will apply for most of the plan, or be ready to reorder when the promotion ends.
Letting the rolled payment shrink
When a debt is paid, its full payment must move down the line. Lowering your total outlay at that point turns the avalanche back into a minimums plan.
Adding new balances to cleared cards
The plan assumes no new charges. Spending on a card you have already cleared, especially your highest-rate card, rebuilds the most expensive debt.
How much more does the avalanche save than the snowball here?
This example is built the way the avalanche likes it: the biggest balance carries the highest rate. The snowball would pay off Card B, the student loan and the car loan first, leaving the 27.24% card to collect interest on most of its balance until month 28. The avalanche pays it off in month 23.
The result is $977.02 of interest saved and a debt-free date one month sooner. The snowball still closes its first account by month 7, which some people value. On other sets of debts the gap can be small, so it is worth comparing with your own numbers.
| Debt | Avalanche | Snowball | Minimums only |
|---|---|---|---|
| Card A ($9,500 at 27.24%) | Month 23 | Month 28 | Month 63 |
| Card B ($1,700 at 19.9%) | Month 25 | Month 7 | Month 51 |
| Car loan ($4,300 at 8.9%) | Month 26 | Month 16 | Month 27 |
| Student loan ($2,100 at 4.5%) | Month 27 | Month 12 | Month 38 |
| Total interest | $3,959.69 | $4,936.71 | $9,873.63 |
| Debt-free in | 27 months | 28 months | 63 months |
How much does the extra monthly payment matter?
The order saves interest, but the size of the budget sets the pace. With no extra at all, the roll-down still beats minimums because each freed payment keeps working. Adding even a modest extra shortens the timeline substantially.
The table runs the same debts with four different extra amounts, all using the avalanche order.
| Extra each month | Total monthly budget | Debt-free in | Total interest | Saved vs minimums |
|---|---|---|---|---|
| $0 | $575 | 45 months | $8,109.75 | $1,763.88 |
| $100 | $675 | 35 months | $5,762.44 | $4,111.19 |
| $250 | $825 | 27 months | $3,959.69 | $5,913.94 |
| $400 | $975 | 22 months | $3,033.66 | $6,839.97 |
Terms used on this page
- Debt Avalanche
- The debt avalanche is a payoff strategy where you pay the minimum on every debt and put all extra money toward the balance with the highest interest rate first. When that debt is gone, its payment rolls to the next-highest rate. Mathematically, it usually minimizes total interest and often finishes as fast or faster than other orders.
- Debt Snowball
- The debt snowball is a payoff strategy where you pay minimums on everything and direct all extra money to the smallest balance first, regardless of interest rate. Each payoff frees up a payment that rolls into the next-smallest debt. It can cost more interest than the avalanche but delivers quick wins that help many people stay on track.
- Promotional APR
- A promotional APR is a temporary, reduced interest rate, often 0%, that a card issuer offers for a set period on purchases, balance transfers or both. When the promotion ends, any remaining balance is charged the card's regular APR. It can save real money if you plan to pay the balance off within the window.
- Minimum Payment
- The minimum payment is the smallest amount a credit card issuer or lender requires each billing cycle to keep the account in good standing. On cards it is often a small percentage of the balance plus interest, so paying only the minimum keeps you current but can stretch repayment over many years and multiply interest.
- Interest Rate
- An interest rate is the price of money, stated as a percentage of the balance per year. Borrowers pay it to lenders, and savers earn it from banks. The rate alone does not include fees or compounding, so it can understate the true yearly cost of a loan or overstate a simple comparison of savings accounts.
Debt Avalanche Roll-Down Calculator: common questions
Is the debt avalanche always the cheapest way to pay off debt?
For a fixed total monthly payment and fixed rates, yes. Sending money to the highest rate first minimizes interest every month, so no other order can cost less. It can tie with other orders when debts share similar rates or when the smallest balance is also the highest-rate one. Real-world factors such as a promotional rate ending or a fee can occasionally change the cheapest order, so re-check when terms change.
What does roll-down mean in debt payoff?
It describes what happens when a debt is paid off: its whole payment rolls down to the next debt on the list instead of leaving your budget. Your total monthly outlay stays level, while the payment aimed at each new target keeps getting larger. The rolling continues until the last debt is gone, so the final target receives the entire monthly budget.
How do I list debts for the avalanche method?
Sort them by annual interest rate, highest at the top. If two debts have the same rate, the order between them makes little difference to interest; many people put the smaller one first for an earlier win. Use the APR from each statement, and if a card has different rates for purchases and cash advances, enter the rate that applies to most of its balance.
Should I use the avalanche if one debt has a 0% promo rate?
Rank it by the rate it will have when the promotion ends, and check whether the balance will be cleared in time. If not, plan to target it before the promo expires, because any remaining balance will then accrue at the regular rate. A 0% debt naturally falls to the bottom of the avalanche list, which is fine as long as it is cleared before the rate jumps.
Does the avalanche method work with credit cards and loans together?
Yes. It treats every debt the same way: minimum on each, extra to the highest rate. Cards often top the list because their rates tend to be higher than auto or student loans, but the calculator follows whatever rates you enter. Installment loans keep a fixed minimum, while card minimums may fall, so the calculator holds each minimum at the amount you enter.
How much interest can the avalanche save?
It depends on how spread out your rates are and how large the high-rate balances are. In this page's example it saves $5,913.94 versus minimums and $977.02 versus the snowball. Enter your own debts to see the figure that applies to you. Wider rate spreads and larger high-rate balances generally mean bigger savings.
What if I cannot afford any extra payment?
Set the extra to zero. The roll-down still helps, because each paid-off debt's minimum moves to the next one instead of leaving your budget. It is slower than with an extra, but faster and cheaper than paying each debt's minimum independently. Once the first debt is cleared, you will see the plan pick up speed as its payment rolls forward.
Is a consolidation loan better than the avalanche?
Not necessarily. Consolidation can lower your rate on high-rate balances, but it adds fees and a new loan term. The avalanche needs no application. Some people combine them: consolidate the most expensive cards at a lower rate, then roll down the rest. The debt consolidation calculator compares costs. If the consolidation loan's rate is only slightly lower than your cards, the avalanche on its own may get you most of the benefit for free.
Does the order of payoff affect my credit score?
Indirectly. Paying down card balances lowers your credit utilization, which can help scores, so an avalanche that targets cards first may show results sooner on that factor. Making every minimum payment on time matters more than the order you choose. Over the length of a plan, steady progress on every account is what scoring models reward most.
Sources
- Credit cards — Consumer Financial Protection Bureau. Accessed October 17, 2026.
- Regulation Z (Truth in Lending), 12 CFR Part 1026 — Consumer Financial Protection Bureau. Accessed October 17, 2026.
- Credit reports and scores — Consumer Financial Protection Bureau. Accessed October 17, 2026.
We cite primary sources: regulators, central-bank data and federal agencies. Worked examples on this page are our own calculations, last checked October 17, 2026. See our methodology.