Phase 4 · General Utility
Debt Snowball Calculator
The snowball turns small wins into unstoppable momentum. Enter your debts and your extra payment, and get the one number that matters: the date you're finally debt-free.
How does the debt snowball method work?
Order your debts by smallest balance first, ignoring interest rates. Pay every minimum, then throw all remaining budget at the smallest debt. When it clears, its payment rolls onto the next — so the amount attacking your debt grows with each win while your total monthly outlay never changes.
- Total budget = all minimums + your extra, and it stays constant as debts clear. That fixed budget is what makes the snowball accelerate.
- Worked example (defaults on this page): $15,500 across three cards with $725/month total ($325 of minimums plus $400 extra) clears in 24 months with $1,577 of interest.
- The first debt is gone in 3 months. That early win is the entire point of the method — it is a behavioural strategy, not a mathematical one.
- The avalanche (highest APR first) always costs less in interest. Choose the snowball if momentum is what keeps you paying; the difference in total interest is usually small next to the cost of quitting.
Under the hood
The math, fully exposed
We simulate every month until the last balance is gone:
Order debts by smallest balance first
Each month: add interest = balance × APR ÷ 12 to every debt
Pay every minimum, then all remaining budget on the smallest debt
Total budget = all minimums + extra (held constant as debts clear)
Debt-free date = today + months until every balance hits zero
- The snowball stays the same size: a cleared debt\'s minimum rolls into the extra, so the total you pay each month never drops — it just lands on fewer debts, faster.
- First win comes quick: the smallest balance usually clears within months, and that early victory is the whole psychological point.
- Extra is the accelerator: raising your extra payment compounds, because it both clears debts sooner and frees their minimums sooner.
Your directives
What to do next, based on your numbers
Adjust the sliders to generate tailored recommendations.
Answers
Frequently asked questions
What is the debt snowball method?
You pay the minimum on every debt, then throw all your spare cash at the smallest balance first. When it's gone, its payment "rolls" into the next-smallest — a snowball that grows as each debt clears. It ignores interest rates in favour of quick, visible wins, which is what keeps people motivated enough to finish.
Does the debt snowball actually work?
Behaviourally, very well. Research has found people who attack the smallest balance first are more likely to stay the course and become debt-free than those who optimise purely for interest. You may pay slightly more interest than the mathematically optimal order, but a plan you finish beats a cheaper one you abandon.
Snowball or avalanche — which should I use?
The snowball (smallest balance first) maximises motivation; the avalanche (highest rate first) minimises interest. If your debts are similar in size, or you've struggled to stay consistent, snowball usually wins. If you're disciplined and have one big high-rate balance, avalanche saves more. See our snowball vs avalanche comparison to see the exact gap for your debts.
How does the minimum-payment rollover work?
Each month you pay every debt's minimum so nothing goes delinquent, plus extra on the target debt. The key is that when a debt is paid off, you don't pocket its old minimum — you add it to the extra you're already paying. So the amount hitting your debts stays constant (and the snowball accelerates) until the very last balance is gone.