Finance
Debt Payoff Calculator
Two orderings, one budget: the snowball clears the smallest balance first, the avalanche the highest rate first. Enter your debts to see your debt-free date, the interest each method costs, the order to pay, and what extra payments are worth.
Your debts
NameBalanceAPRMin/mo
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Anything above the minimums, thrown at the target debt
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Strategy
Avalanche — attack the highest rate first, for the lowest cost
Debt-free in · avalanche
1 year 11 months
$11,800 across 3 debts · $620/mo
avalanche
1 year 11 months
$2,269 interest
snowball
2 years
$2,569 interest
The avalanche pays $300.84 less interest than the snowball and finishes 1 month sooner. The snowball clears whole debts faster for motivation.
Total balance
$11,800
Monthly budget
$620
Total interest
$2,269
Total paid
$14,069
Payoff order · avalanche
- 1. Store cardmonth 6
- 2. Credit cardmonth 19
- 3. Personal loanmonth 23
Estimate only. Assumes fixed rates and minimums and that you keep to the budget every month.
Try a scenario
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The basics
Two ways to order the same payoff
Both methods pay the minimum on every debt and throw every spare dollar at one target debt. They differ only in which debt is the target first.
highest rate first
Avalanche — the cheapest order
Interest is the real cost of debt, so killing the highest rate first removes the most expensive dollars first. The avalanche always pays the least total interest, and usually finishes at least as fast as any other order.
On the example debts: 2 years 7 months, $3,840 interest
smallest balance first
Snowball — the order you'll finish
Clearing the smallest balance first gives a quick, complete win that keeps people going. It costs a little more interest than the avalanche, but the momentum is why many borrowers actually reach the end.
On the same debts: 2 years 8 months, $4,156 interest
Method
How the payoff plan is built
Five steps take you from a pile of statements to a single debt-free date.
- 1
Add up the monthly budget
Total every debt's minimum payment, then add whatever extra you can spare. That combined figure is what you deploy every month, and it never shrinks — the whole plan runs on it.
$600.00 minimums + $300 extra = $900.00 a month - 2
Order the debts by your chosen method
Snowball sorts by smallest balance first; avalanche sorts by highest rate first. That single choice is the only difference between the two plans.
avalanche: Store card → Credit card → Personal loan → Car loan - 3
Pay minimums, then attack the target
Each month, interest is charged, every debt gets its minimum, and the entire leftover budget is poured onto the first debt in the order. Nothing spare goes anywhere else.
minimum on all · rest onto Store card until it clears - 4
Roll the freed payment forward
When a debt hits zero, its minimum is added to the extra and the combined amount attacks the next debt. Each payoff makes the next one faster — the snowball effect.
debt clears → its minimum joins the budget for the next target - 5
Repeat to the debt-free date
Continue until every balance is zero. The month the last debt clears is your debt-free date, and the interest paid along the way is the cost of the plan.
debt-free in 2 years 7 months · $3,840.44 interest (avalanche)
Worked examples
Snowball vs avalanche, side by side
The four example debts below — $23,800 in all — paid off with a $900 monthly budget ($600.00 of minimums plus $300 extra). Same money, two orderings.
| Method | Debt-free in | Total interest | Total paid |
|---|---|---|---|
| Avalanche | 2 years 7 months | $3,840 | $27,640 |
| Snowball | 2 years 8 months | $4,156 | $27,956 |
The avalanche saves $315.85 of interest and finishes 1 month sooner. The snowball trades that for clearing whole debts earlier.
Where it shows up
When the plan matters most
Three situations where an ordered payoff beats paying a bit on everything.
20%+ APR
Credit-card debt
Cards carry the highest rates, so ordering them by rate and attacking the worst first saves the most. This is where the avalanche earns its keep.
High rates make the avalanche's saving largest here
cards + loans + car
Mixed consumer debt
When you juggle cards, a car loan and a personal loan, a single plan turns a confusing pile into one target at a time and one debt-free date.
One budget across every balance, not scattered
compare before you borrow
The consolidation decision
Before taking a consolidation loan or a balance transfer, check whether it truly beats simply working the debts you have. Often the plan alone wins.
Beat this plan's cost, or skip consolidating
Reference
The example debts and their payoff order
The four debts used throughout this page, with the month each one clears under each method on a $900 budget. Notice how the two orders diverge after the first debt.
| Debt | Balance | APR | Min/mo | Cleared (avalanche) | Cleared (snowball) |
|---|---|---|---|---|---|
| Credit card | $6,000 | 22.9% | $150 | month 19 | month 24 |
| Store card | $1,800 | 26.0% | $50 | month 6 | month 6 |
| Car loan | $12,000 | 7.5% | $280 | month 31 | month 32 |
| Personal loan | $4,000 | 12.5% | $120 | month 23 | month 14 |
Worth knowing
Six things that decide the plan
Small choices that change how fast, and how cheaply, you get to zero.
momentum vs maths
Pick the method you'll stick to
The avalanche is cheaper on paper, but the snowball's early wins keep more people going. The best method is the one you actually finish, so be honest about what motivates you.
same order, same cost
Sometimes they tie
When your smallest balance is also your highest rate, the two methods choose the same target and cost exactly the same. The choice only matters when the orders differ.
keep them open
Don't close paid-off cards
Closing a card you have cleared cuts your available credit and can raise your utilisation, nudging your score down. Leave it open and unused.
never miss a minimum
Minimums come first
A missed minimum brings late fees, penalty APRs and credit damage that outweigh any interest saved. Pay every minimum, then attack the target with what is left.
throw windfalls at it
Lump sums accelerate everything
A tax refund or bonus applied to the target debt shortens the whole plan, because it removes principal that would otherwise keep earning interest for months.
check the rate first
Consolidation only if it's cheaper
A balance transfer or consolidation loan helps only if the new rate, fees included, beats what you pay now — and only if the old balances stay at zero afterwards.
How extra payments help
What each extra dollar buys
The same example debts on the avalanche, at several extra-payment levels. Even a small addition to the minimums moves the debt-free date sharply — and the interest saved keeps climbing.
| Extra each month | Monthly budget | Debt-free in | Total interest | Interest saved |
|---|---|---|---|---|
| Minimums only | $600 | 4 years 7 months | $9,110 | — |
| +$100 | $700 | 3 years 7 months | $6,009 | $3,101 |
| +$200 | $800 | 3 years | $4,641 | $4,469 |
| +$300 | $900 | 2 years 7 months | $3,840 | $5,270 |
| +$500 | $1,100 | 2 years 1 month | $2,904 | $6,207 |
How we calculate this
The simulation and our assumptions
The calculator runs a month-by-month simulation of your debts, not a shortcut formula, so it handles any mix of balances, rates and minimums.
interest = balance × APR ÷ 12
Each month, in order
Interest is charged on every balance, then each debt gets its minimum, then the whole leftover budget attacks the target debt for the method you chose. Any surplus cascades to the next target the same month.
freed minimums roll forward
The snowball effect, either way
When a debt clears, its minimum is added to the budget for the next target. That rolling is what makes both methods accelerate — and why either beats paying fixed minimums forever.
- Interest rates and minimum payments are held constant for the life of the plan.
- Interest compounds monthly on the outstanding balance of each debt.
- The monthly budget stays fixed; freed-up minimums roll into it as debts clear.
- If the budget cannot even cover total interest, no plan exists — the calculator says so.
Where to get help
Routes out of debt, compared
Ordered by borrower fit, not by any payout — the cheapest route for your situation comes first, whatever it is. Rates and terms are ranges only; get exact figures from the provider.
| Route | Best for | Watch out for |
|---|---|---|
| DIY snowball / avalanche | Debt you can clear in a few years | Requires discipline every month |
| Balance-transfer card | Good credit, card debt | The 0% window ends — and the transfer fee |
| Consolidation loan | A rate below your current average | Fees, and not re-running the cards |
| Debt-relief / settlement | Debt you genuinely can't repay | Credit damage and fees — a last resort |
CalculateThis.io is not a lender or debt-relief provider and does not make credit decisions. When we add partner links they will be marked as sponsored, and we may earn a commission if you apply — it does not change the terms you are offered.
Sources
Where the method comes from
- Consumer Financial Protection Bureau — guidance on paying down debt and choosing an order.
- Research on the debt-snowball effect and repayment behaviour (Harvard Business School / Journal of Consumer Research).
- Standard monthly-compounding interest arithmetic for revolving and installment debt.
FAQ
Common questions
The avalanche is always cheaper: by attacking the highest interest rate first it minimises the total interest. On the example debts it clears them in 2 years 7 months for $3,840.44 of interest, against $4,156.29 for the snowball — a saving of $315.85. The snowball, which clears the smallest balance first, is usually a little more expensive but pays off whole debts sooner, and that visible progress keeps many people going. Pick avalanche if you are motivated by the numbers, snowball if you need momentum. Either beats paying minimums.
The avalanche orders your debts by interest rate, highest first. You pay the minimum on every debt and throw all your spare money at the highest-rate one until it is gone, then roll that freed-up money onto the next-highest rate, and so on. Because interest is the real cost of debt, killing the most expensive rate first always produces the lowest total interest and, usually, the fastest overall payoff.
It does, and its strength is behavioural rather than mathematical. By clearing your smallest balance first you get a quick, complete win — one fewer bill, one fewer minimum payment — and that momentum keeps people paying when a spreadsheet would not. Studies of real borrowers have found the snowball can lead to higher success rates precisely because people stick with it. It usually costs a little more interest than the avalanche, but a plan you finish beats a cheaper one you abandon.
Yes — always pay at least the minimum on every debt, every month. Missing a minimum triggers late fees, penalty rates and credit damage that dwarf any interest you might save by diverting the money. Both the snowball and the avalanche are built on this rule: minimums on everything, then every spare dollar onto the one target debt. When that debt clears, its old minimum rolls into the pile you attack the next one with.
A lot, because extra money goes straight to principal and stops the interest it would have earned. On the example debts, paying nothing extra takes 4 years 7 months and $9,110 of interest; adding $300 a month cuts it to 2 years 7 months and $3,840. The bigger the extra and the earlier you start, the more you save — enter your own numbers to see the effect.
Consolidation can help if it genuinely lowers your average rate — a balance-transfer card with a 0% window, or a personal loan priced below your current cards. The maths only works if the new rate (fees included) beats what you pay now and you do not run the old balances back up. If the rate is not lower, a disciplined snowball or avalanche on the debts you already have is simpler and cheaper. Compare the consolidated payment against the payoff plan here before deciding.
Usually, yes. Paying down credit-card balances lowers your credit utilisation — the share of your available credit you are using — which is one of the largest scoring factors. Keep the cards open after you clear them: closing them cuts your available credit and can nudge utilisation back up. A steady record of on-time payments while you work the plan is the other big driver, so never miss a minimum.
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Ugo CharlesBuilt and fact-checked against our editorial standards · Last updated June 2026
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