Interactive financial calculator
Debt Snowball Calculator
The debt snowball method pays the smallest debt first, then rolls that payment to the next. Simple, motivating, effective.
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Methodology & Assumptions
How this estimate is calculated
Interest is applied monthly to each remaining balance. Minimum payments are made first, then the fixed extra budget targets the smallest remaining balance. The scenario link stores only the extra payment, not the individual debts.
Illustrative result: figures are rounded for display after calculations use full numeric precision. Actual results may differ.
Currency: dollar symbols are a display convention. Enter every monetary amount in one consistent currency; the calculator does not convert currencies or apply jurisdiction-specific tax rules.
How the Debt Snowball Works
The debt snowball method pays off debts from smallest balance to largest, regardless of interest rate. You pay minimums on all debts, then direct every extra dollar to the smallest balance. When it's gone, roll that freed-up payment to the next smallest. The "snowball" grows larger with each debt eliminated.
Enter up to 4 debts above with their balance, interest rate, and minimum payment. Add an extra monthly payment amount — even $100-200/month significantly accelerates payoff.
Snowball vs. Avalanche: The Real Comparison
| Method | Order | Math | Psychology | Best for |
|---|---|---|---|---|
| Snowball | Smallest balance first | Pays more interest | Quick wins, high motivation | People who need momentum |
| Avalanche | Highest rate first | Minimizes interest | Slower wins, requires discipline | Math-driven, disciplined savers |
For the same payments, the avalanche minimizes interest mathematically. The snowball offers earlier balance payoffs, which some people find motivating. A practical method is one you can follow consistently.
How Much Does the Extra Payment Matter?
The extra monthly payment has a far larger impact than the method choice. $5,000 credit card debt at 22% interest:
| Extra Payment | Payoff Time | Total Interest |
|---|---|---|
| $0 extra | Depends on required minimums | Depends on rate and payment terms |
| $100/month extra | 38 months | $2,800 |
| $300/month extra | 16 months | $1,050 |
| $500/month extra | 10 months | $620 |
Once debt-free, consider redirecting former debt payments toward savings or investments, after accounting for cash reserves and other priorities. Use the FIRE number calculator for an illustrative long-term target.
Frequently Asked Questions
Should I pay off debt or invest at the same time?
High-interest debt (above 7-8%) should be paid off before investing beyond employer match. The guaranteed return of eliminating 20% credit card debt exceeds any realistic investment return. Lower-rate debt (below 5%) can coexist with investing, since expected market returns likely exceed the loan rate.
What's the fastest way to pay off $20,000 in debt?
Increase the extra monthly payment as much as possible. At $500/month extra on a $20,000 debt averaging 12% interest, payoff takes approximately 3.5 years with ~$4,000 in total interest. At $1,000/month extra, payoff takes about 1.7 years with ~$2,100 in interest — nearly half the time and interest.
Should I include my mortgage in the debt snowball?
Typically no. Mortgages are excluded from snowball/avalanche strategies because the interest rate is lower than expected investment returns, and the balance is too large for quick wins. Focus the snowball on consumer debt (credit cards, personal loans, car loans, student loans) and make regular mortgage payments.
What if I can't afford any extra payment right now?
Keep required payments current where possible and review the budget for a sustainable amount. You can also ask the lender about rate reductions or hardship options; availability and consequences vary, so confirm the terms before agreeing.