Calculator Inputs
Enter your debts, monthly extra payment, and payoff start date. The calculator applies the snowball strategy automatically.
Example Data Table
| Debt | Balance | APR | Minimum | Snowball rank |
|---|---|---|---|---|
| Store Card | $1,200.00 | 18.50% | $55.00 | 1 |
| Credit Card | $3,500.00 | 24.90% | $120.00 | 2 |
| Personal Loan | $7,800.00 | 12.90% | $175.00 | 3 |
Formula Used
Monthly interest formula
Monthly Interest = Current Balance × (APR ÷ 12)
The calculator converts each annual rate into a monthly rate, then adds one month of interest before applying that month’s payments.
Snowball target rule
Target Debt = Smallest Remaining Balance
All debts receive at least their minimum payment. Any extra payment is directed to the smallest open balance first.
Principal reduction
Principal Paid = Total Payment − Interest Charged
After monthly interest is added, payments reduce the debt. The remaining amount becomes next month’s starting balance.
Monthly debt budget
Debt Budget = Sum of Minimums + Extra Monthly Payment
The calculator keeps this budget constant and rolls freed minimum payments into the next target debt as balances disappear.
How to Use This Calculator
- Enter your extra monthly payment above all required minimums.
- Choose the month and year when your repayment plan starts.
- Add each debt name, current balance, APR, and minimum payment.
- Leave unused debt cards at zero balance.
- Press the calculate button to run the snowball simulation.
- Review the payoff summary displayed above the form.
- Check the payoff order and month-by-month schedule.
- Download the summary or full schedule as CSV or PDF.
Frequently Asked Questions
1) What is the debt snowball method?
It is a repayment strategy that pays minimums on all debts and sends extra money to the smallest balance first. Each cleared debt frees more cash for the next target.
2) How is this different from debt avalanche?
Debt avalanche targets the highest APR first. Debt snowball targets the smallest balance first. Snowball usually improves motivation, while avalanche usually minimizes interest more aggressively.
3) Does the calculator include compound interest?
It applies monthly interest based on APR divided by twelve. That creates the standard month-by-month compounding effect used in many consumer debt payoff estimates.
4) Why do I need minimum payments for every debt?
Minimum payments keep all debts current in the simulation. They also define the monthly cash that rolls into the next balance after a debt is eliminated.
5) Can I leave some debt slots empty?
Yes. Any debt card with a zero balance is ignored. You can use one debt or all six without changing the calculation method.
6) Why might my real payoff date differ?
Actual results can differ because lenders use different posting dates, fees, compounding methods, and payment allocation rules. Rate changes and missed payments also affect real outcomes.
7) What does the schedule table show?
It shows each simulated month’s starting balance, total payment, interest charged, principal reduction, ending balance, and the debt currently receiving the snowball payment.
8) Should I always choose snowball?
Snowball works well when quick wins improve consistency. If minimizing interest is your only goal, compare it with avalanche before choosing your repayment plan.