Debt Snowball vs. Avalanche Calculator
List your debts below to see how long each payoff strategy would take, how much interest you'd pay, and which one wins for your specific numbers.
Your debts
Results
Snowball (smallest balance first)
| Months to debt-free | - |
|---|---|
| Total interest paid | - |
Avalanche (highest rate first)
| Months to debt-free | - |
|---|---|
| Total interest paid | - |
When each debt is paid off
The month (and approximate calendar date) each debt reaches a zero balance under each strategy, ordered by how each method attacks them.
| Debt | Balance | Rate | Snowball payoff | Avalanche payoff |
|---|
Total balance over time
Debt snowball vs. avalanche: which payoff method is right for you?
If you are juggling several balances, the hardest question is not whether to pay them down but in what order. Two popular systems answer that differently: the debt snowball and the debt avalanche. They share the same engine and differ by a single rule, yet over a payoff plan that rule can mean thousands of dollars in interest and the difference between a plan you abandon and one you finish. This calculator runs both methods on your exact debts so you can see the trade-off before you commit. Your entries are saved in this browser automatically.
How both methods actually work
Every month, both strategies do exactly two things. First, they pay the required minimum on every debt, so no account goes delinquent. Second, they take one lump of spare cash (the extra monthly payment you enter above) and throw all of it at a single target debt. That is the whole machine. The methods disagree only on which debt is the target.
The real power comes from what happens when a debt reaches zero. Its minimum payment does not vanish from your budget; that freed-up money rolls forward onto the next target, on top of your extra payment. So the amount hitting the current target grows every time an account falls, while your total monthly outlay stays flat. Payoff speeds up as you go, like a ball rolling downhill. The avalanche works the same way, in a different order.
The snowball: smallest balance first
The snowball method orders your debts from smallest balance to largest, ignoring interest rates, and attacks the smallest first. The appeal is behavioral rather than mathematical: wiping out an entire account, even a small one, is a concrete, visible win that often comes quickly. Motivation is the scarce resource in any multi-year payoff, and many people stay on a snowball plan because each cleared debt feels like real, countable progress, where chipping slowly at one giant balance can feel like getting nowhere.
The avalanche: highest interest rate first
The avalanche method orders your debts from highest interest rate to lowest and attacks the highest rate first, regardless of balance size. Because interest is the force that makes debt grow, killing the fastest-growing balance first is mathematically guaranteed to minimize the interest you pay, and in almost every case it clears everything at least as fast. It is the cheapest possible path. The catch is that it does not always feel like progress early on if your highest-rate debt is also large.
Why avalanche usually wins on paper, but snowball sometimes wins in practice
On a spreadsheet, avalanche is never worse: it is the least-interest, fastest-or-tied route by definition. But a payoff plan only works if you keep paying, and research on real borrowers finds that people who get an early win are more likely to stay the course. A snowball plan you finish beats an avalanche plan you quit in month eight. The right method is the one you will actually stick with: if the snowball's extra interest cost is small, the motivation is worth it; if the gap is large, the avalanche's savings may be worth the patience.
A worked example with the sample debts
The three debts loaded above make the trade-off concrete: Credit Card A at $4,000 and 22%, Credit Card B at $2,000 and 18%, and a Car Loan of $10,000 at 6%, with $150 extra a month.
The snowball attacks Credit Card B first (smallest balance), then Card A, then the car loan. The avalanche attacks Credit Card A first (highest rate), then Card B, then the car loan. Both plans finish in the same 36 months, but the avalanche pays roughly $2,484 in total interest while the snowball pays roughly $2,607, so the avalanche saves about $123. The timelines match because the car loan (the largest balance) dominates the finish date under either order, yet the avalanche costs less because it starves the 22% card first. This modest gap is exactly the case where the snowball's motivational edge might be worth a small premium. Change the balances or rates above and watch it widen or close.
Reading the table and chart on this page
The "When each debt is paid off" table lists every debt with the month (and approximate calendar date) it hits zero under each strategy. Read the two payoff columns side by side to see how differently the methods sequence your accounts: a debt that clears in month 10 under one plan may not clear until month 22 under the other. The "Total balance over time" chart plots two lines, one per strategy, showing your combined balance fall month by month. A lower line means less debt remaining at that point.
Common mistakes to avoid
- Not paying any extra at all. With no extra payment, both methods collapse into paying minimums, which can stretch high-rate balances out for decades. Even a small amount, applied consistently, transforms the timeline. The extra payment field is where the leverage lives.
- Closing a paid-off card on impulse. Clearing a card is a milestone, but closing it can shorten your credit history and raise your utilization ratio, which may ding your score. Keep the account open unless it carries a fee you cannot avoid.
- Ignoring high-rate debt. Letting a 22% balance sit means interest compounds against you every month. If your rates vary widely, make sure the worst offender is not being neglected.
- Taking on new debt during payoff. Adding a new balance while paying down old ones is like bailing a boat with the hole still open. Pause new borrowing until the plan is done, or the freed-up minimums you count on never free up.
Frequently asked questions
Which is better, the debt snowball or the debt avalanche?
The avalanche always costs the least interest and is never slower, so on paper it is better. The snowball gives earlier, more motivating wins that help many people stay on the plan. If the interest gap for your debts is small, the snowball's motivation may be worth it; if the gap is large, the avalanche's savings probably win.
How much does the avalanche method actually save?
It depends on your mix of debts. When your smallest balance is also your highest rate, both methods pick the same target and save the same amount. The gap widens when a large balance carries your highest rate. With the sample debts the avalanche saves about $123; with other numbers it could be a few dollars or several thousand.
Should I keep paying the minimums on my other debts?
Yes, always. Both methods pay the full minimum on every debt each month so nothing goes delinquent, and only the spare cash beyond those minimums goes to the target. Missing a minimum triggers late fees and credit damage that dwarf any payoff strategy. The extra payment is on top of your minimums, never instead of them.
What happens to a debt's minimum payment once it is paid off?
It rolls forward. The money that covered the cleared debt's minimum is added to your extra payment and thrown at the next target, so the amount attacking that target grows with each account you eliminate. Your total monthly payment stays the same but concentrates on fewer debts, which is why payoff accelerates toward the end.
Can I include a mortgage or student loan in this calculator?
You can add any debt with a balance, rate, and minimum payment, so a student loan fits naturally. A mortgage can be entered too, but its large balance and low rate usually make it the last target under either method, which can stretch the timeline toward the 50-year cap. These strategies work best on credit cards, personal loans, and auto loans.