Debt Snowball Calculator
Model the debt snowball method on two debts: pay the smallest balance first while covering interest on the rest, and see months to payoff and total interest.
How to use this tool
- Enter each debt's balance and APR.
- Enter the total monthly budget you can put toward both debts.
- The calculator attacks the smallest balance first, then rolls onto the next.
- Read the months to clear both debts and the total interest paid.
Model the debt snowball method on two debts. The snowball targets the smallest balance first for quick, motivating wins. See months to payoff and total interest.
Formula
Each month every debt accrues interest at its own monthly rate (APR ÷ 12). The total budget then pays interest and reduces principal, directing all available money to the smallest remaining balance first.
When the smallest debt is cleared, its freed-up money rolls onto the next smallest — the snowball.
Total interest is the sum of interest accrued until both debts reach zero.
How it works
The debt snowball method orders debts from the smallest balance to the largest, regardless of interest rate, and throws every spare dollar at the smallest one while paying the bare minimum interest on the rest. When the smallest balance hits zero, the money that was freed up rolls onto the next smallest, building momentum. This calculator models two debts: each accrues interest at its own monthly rate, then the total budget is applied smallest-balance-first until both are clear.
Snowball's appeal is psychological — quick wins from eliminating whole accounts keep people motivated, which research suggests improves follow-through. The trade-off is cost: paying the smallest balance first rather than the highest rate can mean slightly more total interest than the avalanche method. The budget must at least cover the combined interest each month, or the debts never shrink; the tool flags that case.
Reviewed by the AbraCalc Credit Desk. This is general information, not financial advice; confirm your card's terms (APR, fees, minimum-payment rule) with your issuer or a qualified advisor.
Worked example
$1,000 and $2,000 debts at 0%, $1,000/month budget
- Both debts are at 0%, so no interest accrues.
- Month 1: $1,000 clears the smaller $1,000 debt.
- Months 2–3: $1,000 + $1,000 clear the $2,000 debt.
- Total of three monthly payments = $3,000, all principal.
Months to pay off both = 3, total interest = $0.00
Snowball payoff at 0% APR (combined balance vs monthly budget)
| Combined balance | $500/mo | $1,000/mo | $2,000/mo |
|---|---|---|---|
| $2,000 | 4 months | 2 months | 1 month |
| $3,000 | 6 months | 3 months | 2 months |
| $5,000 | 10 months | 5 months | 3 months |
| $10,000 | 20 months | 10 months | 5 months |
Key terms
- Debt snowball
- A payoff strategy that targets the smallest balance first to build motivating quick wins.
- Monthly budget
- The total amount you direct at all debts each month, covering interest plus principal.
- Rollover
- When a paid-off debt's payment is added to the next target debt, accelerating payoff.
- Snowball vs avalanche
- Snowball orders by smallest balance; avalanche orders by highest interest rate.
Frequently asked questions
- How is the snowball different from the avalanche?
- The snowball pays the smallest balance first for motivating quick wins; the avalanche pays the highest APR first to minimize total interest. The avalanche usually costs a little less.
- Why does the snowball method work for many people?
- Eliminating whole accounts quickly creates visible progress and momentum, which helps people stay committed — behavior that often matters more than a small interest difference.
- What if my budget only covers the interest?
- Then the balances never shrink. The calculator flags this case; you need a budget greater than the combined monthly interest to make progress.