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Debt Snowball Calculator
Pay off your debts smallest first and watch the snowball grow. Enter up to five debts plus the extra amount you can pay each month, and this calculator simulates the snowball month by month — showing your payoff order, your debt-free date, and exactly how much interest you will pay along the way.
Estimates only, not financial advice. Results assume fixed APRs and minimum payments; real lenders may change rates or minimums. Consider a nonprofit credit counselor if payments do not cover interest.
How it works
The debt snowball is a payoff strategy built on momentum rather than math. You list all your debts from the smallest balance to the largest, pay only the minimum on every debt except the smallest, and throw every spare dollar at that smallest one. The moment it is paid off, you take the money you were paying on it — its minimum plus the extra — and roll it into the next smallest debt. Your monthly payment on the target debt keeps growing, like a snowball rolling downhill, until the last and largest debt falls too.
Why smallest first, instead of attacking the highest interest rate? Because quick wins keep people going. Clearing a $500 card in a few months feels like real progress, and that feeling is what keeps most people sticking with a plan that takes a year or more. The alternative — the avalanche method, which targets the highest interest rate first — saves more money on paper, but studies of real payoff behavior find that people using the snowball are more likely to finish. A plan you complete beats a perfect plan you abandon in month three.
This calculator simulates that process month by month. Every month it pays the minimum on each debt you still owe, then applies your extra payment — plus the minimums freed up from debts already paid off — to the smallest remaining balance. Interest then accrues on whatever balance is left, at one twelfth of the annual rate. The simulation runs until every balance reaches zero, or until 600 months pass, in which case it tells you the plan will not finish and you need bigger payments or a lower rate. The result is your payoff order, the month each debt disappears, the total number of months until you are debt-free, and the total interest you will pay.
The extra payment is the lever that changes everything. In the example below, adding $100 a month clears two debts in 18 months instead of the years that minimum payments alone would take. Even $25 or $50 extra a month can shave months off the plan, because every extra dollar goes straight at the smallest balance rather than being spread thin. If your budget is tight, start with whatever extra you can find — cancel one subscription, cook two more meals a week — and raise it when you can. The calculator updates live, so try a bigger extra payment and watch the debt-free date move closer.
There is one warning sign to watch for: if a minimum payment is smaller than the monthly interest on that debt, the balance grows even while you pay. That is the minimum-payment trap, and it means the debt can never be paid off at that rate. If the calculator reports that your plan will not finish, that is the first thing to check. The fixes are a larger payment, a lower interest rate through a balance transfer or consolidation loan, or a call to a nonprofit credit counselor, who can often negotiate lower rates with your lenders.
Worked example
Jordan owes $500 on Card A at 20% APR with a $25 minimum payment, and $2,000 on Card B at 15% APR with a $50 minimum payment. Jordan can pay an extra $100 a month on top of the minimums, for a total of $175 a month toward debt.
Step 1: Order the debts smallest first — Card A ($500), then Card B ($2,000).
Step 2: Each month, pay the $25 and $50 minimums, and put the extra $100 toward Card A, so Card A gets $125 a month.
Step 3: Card A is paid off in month 5.
Step 4: From month 6, the whole $175 a month goes to Card B — its $50 minimum plus the $25 freed from Card A plus the $100 extra.
Step 5: Card B is paid off in month 18.
Running this exact plan through the calculator gives: Card A paid off in month 5, Card B paid off in month 18, debt-free in 18 months, with total interest of $256.94 and total paid of $2,756.94. Without the extra $100 a month, the same two debts would take far longer and cost much more in interest — the snowball's extra payment is doing the heavy lifting. Try changing the extra payment above to $150 and see how many months you save.
FAQ
What is the debt snowball method?
The snowball method means paying off your smallest debt first while making minimum payments on the rest. When the smallest debt is gone, you roll its payment into the next smallest debt, so your monthly payment grows like a snowball rolling downhill until every debt is paid off.
Snowball vs avalanche — which is better?
The avalanche method, paying the highest interest rate first, saves more money on interest. The snowball method saves less money but gives quick wins that keep people motivated, and research shows people using the snowball are more likely to stick with the plan and finish. The best method is the one you will actually follow.
What if my minimum payments do not cover the interest?
Then the balance grows every month even though you are paying, and the debt can never be paid off that way. This calculator will warn you if that happens. In that case you need a larger payment, a lower interest rate through a balance transfer or consolidation, or help from a nonprofit credit counselor.
Can I add more than 5 debts?
This calculator handles up to 5 debts at a time. If you have more, enter your 5 smallest first and run the plan, then add the remaining debts afterward. The smallest debts are the ones the snowball attacks first, so they matter most.
Should I save an emergency fund first?
Most financial planners say yes — a small starter emergency fund of around 1,000 dollars first, so that a car repair or medical bill does not go straight back onto a credit card and undo your progress. Once the debts are gone, build the fund up to three to six months of expenses.