The debt snowball method pays off the smallest balance first, regardless of interest rate — a fixed monthly budget covers every debt’s minimum, and whatever’s left goes entirely to the smallest one until it’s gone.
How it works
Every debt gets its minimum payment. Leftover budget goes to the smallest-balance debt. Once that debt is cleared, its entire payment — minimum plus whatever extra was targeting it — rolls onto the next-smallest debt, and so on.
A behavioral strategy, not the mathematically fastest one
Paying off the smallest balance first, regardless of rate, is not what minimizes total interest paid — the debt avalanche calculator on this site, which targets the highest interest rate first, does that instead. Snowball is popular because it produces an early, visible win — a fully paid-off debt — which research on habit formation suggests helps some people stay motivated through a long payoff process. Whether that motivational benefit is worth the extra interest it usually costs is a personal judgment; run the same numbers through both calculators to see exactly what the trade-off costs for your own debts.
How to use this calculator
- List each debt: name, balance, APR, minimum payment — one per line.
- Enter the total you can put toward all debts combined each month.
- Read the payoff order and total time and interest.
Frequently asked questions
Why does the order matter if I’m paying the same total either way?
Because interest keeps accruing on every debt until it’s paid off — concentrating extra payments on one debt at a time clears it faster than spreading extra payments thin across several, and which debt gets targeted first changes how much total interest accrues along the way.
What if my total budget doesn’t cover all the minimums?
Then the plan as stated isn’t achievable — this calculator declines rather than simulating a scenario where some minimums go unpaid, since that would understate real consequences like late fees and credit damage.
Should I include my mortgage in this list?
Most snowball/avalanche discussions focus on consumer debt (credit cards, personal loans, auto loans) rather than a mortgage, which is typically much larger and on more favorable terms — but the calculator will run the numbers on any debts you enter.
How is this different from the avalanche calculator?
Identical simulation, different order — snowball targets the smallest balance first, avalanche targets the highest interest rate first. Avalanche minimizes total interest; snowball produces earlier individual payoffs.
Why do balances stay listed even after I’ve technically paid extra?
Because in this simulation, only one debt at a time receives extra payment beyond its minimum — every other debt keeps accruing interest at its own rate on its own remaining balance until its turn comes.
