Debt Snowball Calculator
The snowball method pays the smallest balance first; the avalanche pays the highest rate first. Both make minimum payments on everything else and throw every spare dollar at one target, then roll that payment onto the next debt when it clears.
Avalanche always costs less in interest — it is optimising for exactly that. Snowball closes accounts sooner, which matters to anyone who has started a payoff plan before and stopped. The calculator runs both across your actual debts so the trade is a number rather than an argument.
Compare both methods across your debts
Add every debt with a minimum payment, including the ones you would rather not look at. A plan built on a partial list fails at the first thing it did not account for.
How the rolling payment works
The mechanism both methods share is what makes either work. You pay the minimum on every debt, add whatever you can spare to one chosen target, and when that target clears you add its whole payment — minimum plus extra — to the next.
The amount going toward debt therefore stays constant while the number of debts falls, which is why the pace increases sharply toward the end. The last debt is being paid at a rate that would have looked impossible at the start.
The failure mode is spreading the extra evenly across everything. It feels fair, makes progress on every line, and clears nothing — so no payment is ever freed and the roll never begins.
What the two orders actually cost
The cost difference is usually smaller than the argument about it suggests — often a few hundred dollars across a multi-year plan, occasionally more where one debt carries a very high rate on a large balance. Run both above and look at your own gap before choosing on principle.
| Snowball | Avalanche | |
|---|---|---|
| Order | Smallest balance first | Highest rate first |
| Optimises for | Accounts cleared early | Total interest |
| Total cost | Higher | Lowest possible |
| First win arrives | Sooner | Later, sometimes much later |
| Best for | Anyone who has abandoned a plan before | Anyone who will finish regardless |
A hybrid that usually beats both
Take the avalanche order and move any very small balance to the front. Clearing a two-hundred-dollar debt costs almost nothing in extra interest, removes a payment from the list immediately, and buys the psychological start the snowball is prized for.
The same logic applies at the other end: a large debt at a low rate — a mortgage, a subsidised student loan — usually does not belong in the plan at all. Including it delays the finish for years and the money is often better directed at retirement contributions or the emergency fund.
What matters is that the order is decided once and then followed. Reordering the plan every month is how a payoff schedule becomes an ongoing deliberation that never finishes.
Before the plan starts
- Keep a small starter emergency fund. Without one, the first unexpected expense goes back on a card and undoes several months.
- Do not skip an employer retirement match to pay debt faster. A fifty percent match is an immediate return no consumer interest rate matches.
- List every debt, including family loans and anything in collections. A plan missing a line is a plan that breaks when it surfaces.
- Confirm each minimum from the current statement rather than memory — several will have changed.
- Stop using the accounts being paid down. This is the step that decides whether any of the rest matters.
Where extra money comes from
The extra payment is the whole engine, and for most households it is assembled rather than found. The reliable sources are recurring subscriptions nobody would miss, an insurance policy that has not been re-shopped in three years, and a tax refund treated as debt payment rather than income.
Windfalls matter disproportionately because they hit the principal of the current target directly and pull the whole schedule forward. A single bonus applied to the front of the plan can remove several months from the end of it.
Raising income usually beats further cutting once the obvious cuts are made. Overtime, a temporary second job or freelance work has no ceiling, whereas a budget does — and it is worth remembering that the plan is finite, which makes an unpleasant temporary arrangement much easier to sustain.
Staying with it
Multi-year plans fail in the middle, not at the start. The initial enthusiasm carries a few months and the finish is too far away to pull, which is the argument for tracking something that moves visibly — a chart, a total, anything that changes monthly.
Rerun the calculator every few months with real balances. Progress is usually ahead of expectation because minimums fall as balances do, and seeing the finish date move closer is worth more than any budgeting technique.
Build in something for the milestones. A plan with no relief in it competes against every impulse for three years and frequently loses; a small, planned reward at each cleared debt costs a few weeks and saves the whole thing.
Frequently asked questions
Avalanche costs less in interest, always, because that is what it optimises. Snowball clears accounts sooner and is more likely to be finished by someone who has abandoned a plan before. Run both on your actual debts — the gap is often smaller than the debate suggests.
Pay minimums on everything, put every spare dollar on the smallest balance, and when it clears roll its whole payment onto the next smallest. The amount going toward debt stays constant while the number of debts falls.
Keep a small starter emergency fund first, and never skip an employer retirement match to pay debt faster. Beyond that, high-interest consumer debt generally beats additional saving.
Usually not. A large balance at a low rate delays the finish by years, and the money is typically better directed at retirement contributions or a fully funded emergency fund.