Avalanche pays $1,931 interest vs. $2,221 for snowball.
Debt Snowball
Smallest balance first
Debt-free in
2 yr 3 mo
Total interest
$2,221
Total paid
$18,721
Payoff order
Store card — month 4
Credit card — month 18
Car loan — month 27
Debt Avalanche
Least interest
Highest APR first
Debt-free in
2 yr 3 mo
Total interest
$1,931
Total paid
$18,431
Payoff order
Credit card — month 15
Store card — month 17
Car loan — month 27
Minimum due in month 1: $330/mo
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Debt Snowball
Pay the minimum on every debt, then throw all your spare budget at the debt with the smallest balance. When it clears, roll its payment onto the next-smallest. The quick wins build momentum — the psychological case for the snowball.
Extra payment → smallest balance first
Debt Avalanche
Pay the minimum on every debt, then throw all your spare budget at the debt with the highest interest rate. When it clears, roll its payment onto the next-highest APR. This minimizes the total interest you pay — the mathematically optimal order.
Extra payment → highest APR first
How It Works
Both the debt snowball and the debt avalanche are repayment strategies for someone juggling several debts with one fixed monthly budget. Each month the calculator does the same three things: it adds one month of interest to every remaining balance (balance × APR ÷ 1200, since the APR is entered as a percent), it pays the minimum on every debt, and then it applies whatever budget is left to one target debt. The only difference between the strategies is which debt is the target. The snowball targets the smallest balance first, so you clear individual debts quickly and feel progress; the avalanche targets the highest interest rate first, so you stop the most expensive interest from accruing. In both methods, when a debt is paid off the money that was going to it 'rolls over' onto the next target — this is what makes the payoff accelerate over time. The avalanche always pays the same or less total interest than the snowball; the snowball often clears the first debt sooner. This calculator simulates both month by month so you can compare the total interest, the payoff time, and the order debts disappear.
Example Problem
You owe $1,500 on a store card at 8% (min $30), $6,000 on a credit card at 24% (min $120), and $9,000 on a car loan at 6% (min $180), and you can put $700 a month toward debt. Compare snowball and avalanche.
Total minimum payments = $30 + $120 + $180 = $330, so $370 of extra budget is available each month.
Snowball order (smallest balance first): store card ($1,500), credit card ($6,000), car loan ($9,000).
Avalanche order (highest APR first): credit card (24%), store card (8%), car loan (6%).
Snowball clears the store card first (about month 4), then the credit card (about month 18), then the car loan, finishing in 27 months with about $2,221 in total interest.
Avalanche attacks the 24% credit card first (cleared about month 15), then the store card, then the car loan, also finishing in 27 months — but with only about $1,931 in total interest.
Switching from snowball to avalanche saves about $290 in interest at the same $700 monthly budget, because the costly 24% card is cleared sooner.
The strategies save different amounts depending on the debts. Avalanche always pays the least interest; the snowball can still be worth it if clearing the small store card first keeps you motivated. Here both plans finish in the same 27 months, so the only difference is the $290 of interest.
When to Use Each Variable
Choose the snowball — when you are motivated by visible progress and want to clear individual debts as fast as possible to stay committed.
Choose the avalanche — when you want to pay the least total interest and are disciplined enough to stick with the plan without early quick wins.
Key Concepts
The core idea behind both strategies is the payment rollover, sometimes called the debt snowball effect: your total monthly payment stays constant, but as each debt clears, more of that fixed budget attacks the remaining debts, so the payoff accelerates. The two strategies only disagree on order. The avalanche is provably optimal for total interest because interest accrues fastest on the highest-rate balance, so eliminating that balance first removes the most future interest. The snowball trades a little extra interest for behavioral momentum — research on real borrowers has found that the quick wins of clearing small balances improve the odds people stick with repayment. Either way, the single biggest lever is the monthly budget: every extra dollar above the minimums goes entirely to principal on the target debt and compounds into a shorter payoff and less interest. The minimum payments matter too — if your budget only just covers the minimums, almost nothing reaches principal and the debt can take decades to clear.
Applications
Comparing snowball vs avalanche on your actual debts before committing to a plan
Seeing how much interest a higher monthly budget would save
Finding the order to attack credit cards, car loans, and student loans
Estimating your debt-free date under a realistic monthly payment
Deciding whether the interest savings of the avalanche outweigh the motivation of the snowball
Checking whether your current budget even covers the minimum payments
Common Mistakes
Budgeting only enough to cover the minimums — almost none of that reaches principal, so high-interest debt can grow or barely move.
Assuming the snowball and avalanche always differ a lot. When your highest-rate debt is also small, they nearly coincide.
Ignoring the behavioral side. The avalanche saves interest, but if the snowball's quick wins keep you on track, the snowball can win in practice.
Forgetting that interest accrues every month on the full remaining balance, not just on what you don't pay.
Opening new debt while paying down old debt — new balances reset the progress and add new interest.
Not revisiting the plan after a raise or windfall — extra budget shortens the payoff dramatically because it all hits principal.
Frequently Asked Questions
What is the difference between the debt snowball and debt avalanche?
Both pay the minimum on every debt and put all spare money toward one target debt. The snowball targets the smallest balance first for quick motivational wins; the avalanche targets the highest interest rate first to minimize total interest. The avalanche always costs the same or less in interest; the snowball often clears the first debt sooner.
Which is better, snowball or avalanche?
Mathematically, the avalanche is better — it always pays the least total interest because it eliminates the highest-rate balance first. Behaviorally, the snowball can be better because clearing small debts quickly builds momentum that helps people stick with the plan. This calculator shows both so you can weigh the interest saved against the motivation of quick wins.
How does the debt snowball work?
List your debts smallest balance to largest. Pay the minimum on all of them, then put every spare dollar toward the smallest. When it is paid off, roll its entire payment onto the next-smallest debt, and so on. Because your total monthly payment stays the same, each payoff frees up more money and the remaining debts fall faster.
How does the debt avalanche work?
List your debts highest interest rate to lowest. Pay the minimum on all of them, then put every spare dollar toward the highest-APR debt. When it clears, roll its payment onto the next-highest rate. Attacking the most expensive interest first means less interest accrues overall, so you pay less in total than the snowball.
Does paying more than the minimum really help?
Yes, dramatically. Minimum payments are mostly interest early on, so a balance can barely move if you only pay the minimum. Every dollar above the minimum goes straight to principal on the target debt, which reduces future interest and shortens the payoff. Raising the monthly budget is the single most powerful change you can make.
What if my budget does not cover all the minimum payments?
Then neither strategy can work as modeled — you must at least cover every minimum to avoid penalties and growing balances. The calculator flags this and asks you to raise the budget to at least the minimum due in the first month (each debt's minimum, capped at what it actually owes that month). If that is not possible, contact your lenders about hardship options or a credit counselor.
Both strategies follow the same monthly mechanics and differ only in which debt receives your spare budget. Each month, for every debt:
interest = balance × APR ÷ 1200Monthly interest added to each balance (APR entered as a percent)
extra budget → smallest balance (snowball) or highest APR (avalanche)After paying every minimum, the leftover budget attacks one target debt
When a debt reaches zero, the money that was paying it “rolls over” onto the next target debt, so the payoff accelerates over time. The debt snowball targets the smallest balance first for fast, motivating wins; the debt avalanche targets the highest interest rate first, which always pays the least total interest. This calculator runs both simulations month by month on your exact debts and budget.
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