Debt Snowball vs Avalanche Calculator
Snowball or avalanche? The honest answer depends on your debts, not on which guru you follow. Enter your real balances below and watch both strategies play out, month by month.
Snowball vs avalanche: what are they?
Both methods follow one rule: pay minimums on every debt, then throw every spare dollar at a single target. They only disagree on the target.
- Snowball (Dave Ramsey's famous version): attack the smallest balance first. You knock out an entire account every few months. Each freed-up minimum rolls into the next target, so your payments snowball bigger over time. Quick wins, by design.
- Avalanche: attack the highest interest rate first. No psychology, just math. It always minimizes total interest paid.
The calculator above doesn't estimate. It simulates both methods month by month, including the snowballing of freed minimums, so you're comparing reality, not rough guesses.
Which one should you choose?
When your rates sit far apart, say a 24% credit card next to a 6% student loan, avalanche saves real money, often thousands. Take avalanche.
When you've started payoff plans before and stalled out, take snowball. Behavioral research keeps finding the same thing: early wins keep people going, and the best plan is the one you actually finish.
When the APRs are close, the two cost nearly the same. Then motivation wins outright. No shame in that.
Example
Debt 1: $5,000 at 20%, $100 minimum. Debt 2: $2,000 at 15%, $50 minimum. Extra: $200 a month.
Snowball kills Debt 2 first for the quick win, then aims the freed $50 minimum plus the $200 extra at Debt 1. Avalanche goes straight for Debt 1's 20% rate.
Run it above. Avalanche wins on interest, but look how close the finish dates are. That closeness is exactly why the "right" answer is personal, not mathematical.
What the simulation assumes (read this)
Here's precisely what happens in each simulated month. A calculator you can't audit is just a magic box.
- Interest accrues at APR ÷ 12 on each remaining balance, then your payment lands. That matches how most US lenders do it. Cards compounding daily differ by a few dollars across the whole payoff.
- Minimums from a dead debt roll into the attack fund. That's the true snowball mechanic, and it's why payoff accelerates near the end.
- No new charges. No fees. No penalty APRs. No mid-stream balance transfers. Real life is messier, so treat the output as a plan, not a prophecy.
- The simulation caps at 600 months. If you hit the cap warning, your minimums barely cover interest. The math is telling you something urgent: raise payments or cut rates, now.
The hybrid approach nobody talks about
You don't have to marry one method. Plenty of people who've actually gotten out of debt run a hybrid: snowball first, avalanche after. Kill one or two small balances for the psychological win, then switch to highest-APR for the mathematical win. Motivation spike and most of the interest savings.
Another common split: avalanche for anything above 15% APR, snowball for the rest. The calculator shows you the pure versions. Real life rewards pragmatism.
How to speed up either method
- Raise the extra payment. An extra $100 a month usually beats the entire snowball-vs-avalanche debate. Test it above and see.
- Stop adding new debt while you pay down. Otherwise the simulation, and your plan, never ends.
- Consider a 0% intro-APR balance transfer for the high-rate cards. Only if you'll genuinely clear it before the promo expires.
- Call and negotiate your rates. One phone call can shave several points off a credit card APR, and every point compounds monthly in your favor.