Debt snowball vs debt avalanche in one minute
Both methods work the same way: you pay the minimum on every debt, put every extra dollar toward one target debt, and when that debt is gone you roll its payment into the next target. The only difference is the order.
- Debt snowball: target the smallest balance first. You get fast, visible wins that build momentum.
- Debt avalanche: target the highest interest rate first. You pay the least interest overall.
How the calculator models your payoff
For each method the calculator simulates your debts month by month:
- Interest is added to each balance (APR ÷ 12 times the balance).
- The minimum payment is paid on every debt that still has a balance.
- Your extra payment, plus the minimums of any debts already paid off, goes to the current target. If the target is cleared mid-month, the leftover flows straight to the next one.
Your total monthly outlay stays constant (the sum of all minimums plus your extra payment) until you're debt-free. For comparison it also shows a "minimum payments only" scenario, where you pay just the minimums and nothing rolls over.
Worked example
Take four debts: a store card ($1,200 at 18%), a personal loan ($3,500 at 11%), a Visa card ($7,800 at 24.9%) and a car loan ($11,500 at 7.4%), with $630 in combined minimums and $300 extra each month.
- Snowball: the store card is gone in month 4 and the personal loan in month 12. Debt-free in 31 months, about $4,660 in interest.
- Avalanche: the Visa card goes first, but not until month 20. Debt-free in 31 months, about $4,040 in interest.
- Minimums only: 87 months and almost $11,900 in interest.
The avalanche saves about $620 here. The snowball delivers its first win more than a year earlier. Whichever you choose, the big win is the roll-over itself: it cuts the payoff time from over 7 years to under 3.
Which method should you choose?
If the interest difference the calculator shows is small, choose the method you'll stick with. For many people that's the snowball, because closing accounts early keeps motivation up. If the difference is large (typically when a big balance carries a high rate), the avalanche is worth the wait for your first win.
Some people use a hybrid: knock out one or two tiny balances first for momentum, then switch to the avalanche. You can test that by ordering your debts that way and comparing the results.
Tips to get debt-free faster
- Find more "extra." Even $50 more a month can take months off the plan. Change the extra payment field and watch the debt-free date move.
- Call your card issuers. Asking for a lower APR costs nothing, and a few points off a large balance can matter more than which method you choose.
- Stop adding new debt. Neither method works if balances keep growing. Consider pausing card use while you pay down.
- Keep a small emergency fund. A starter cushion keeps one surprise bill from landing back on a credit card.
Frequently asked questions
Which is better, the debt snowball or the debt avalanche?
Mathematically, the avalanche (highest interest rate first) always costs the same or less interest. The snowball (smallest balance first) gives you quick wins that help many people stay motivated. Research on consumer debt has found that closing out individual accounts is linked to people sticking with repayment, so the 'best' method is the one you'll actually follow. Use the calculator to see how big the difference is for your debts. Often it's small.
Why do both methods finish at the same time in my results?
Because you're putting the same total amount toward debt every month, the overall debt-free date is often identical or within a month or two. The difference shows up in total interest and in when you get your first debt paid off.
What counts as the 'extra monthly payment'?
It's anything you pay on top of the combined minimum payments. When a debt is paid off, its minimum payment is 'rolled over' to the next target, so your total monthly payment stays the same while the amount attacking the target debt grows.
Should I include my mortgage?
Most people leave the mortgage out. Its rate is usually lower than consumer debt, and the balance is so large it would distort the plan. Focus the snowball or avalanche on credit cards, personal loans, car loans and student loans.
Would a balance transfer or consolidation loan help?
It can, if it lowers your interest rate and you don't run the balances back up. Model it here by replacing the debts you would consolidate with a single debt at the new rate, and compare the total interest, including any transfer or origination fees.
Sources
- To Beat Debt, Consider Starting Small (Gal & McShane), Kellogg Insight, Northwestern University
- Consumer Credit – G.19 (credit card interest rates), Federal Reserve Board
This calculator is for educational purposes and gives estimates based on the numbers you enter. It is not financial, tax or legal advice. Last reviewed October 2026.