Debt Snowball vs Avalanche Guide: Formula & Worked Example
Short answer
Compare payoff time and interest for both debt strategies. In the fixed example below, avalanche saves is 0.00. Your answer depends on the inputs and assumptions you choose.
Formula
Result = Debt Snowball vs Avalanche calculation using balances (comma separated), aprs % (same order), minimum payments, extra payment / month
The inputs are balances (comma separated), aprs % (same order), minimum payments, extra payment / month. Use the input scale shown beside each field and keep time periods and units consistent. Only round the final result for display.
Worked example
- Balances (comma separated)
- 3000, 8000, 15000
- APRs % (same order)
- 22, 18, 7
- Minimum payments
- 90, 200, 300
- Extra payment / month
- 300
- Avalanche saves: 0.00
- Snowball: time / interest: 34 mo / 4,071.74
- Avalanche: time / interest: 34 mo / 4,071.74
- Total monthly budget: 890.00
Understanding the result
Compare payoff time and interest for both debt strategies. Start with the base example, then replace each value with the figure that matches your situation.
Balances (comma separated)
The example uses 3000, 8000, 15000 for balances (comma separated). This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
APRs % (same order)
The example uses 22, 18, 7 for aprs % (same order). This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Minimum payments
The example uses 90, 200, 300 for minimum payments. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
Extra payment / month
The example uses 300 for extra payment / month. This is an illustration, not a recommended value. Keep the unit and time period shown by the field.
What the comparison means
The comparison changes only extra payment / month, keeping every other example input fixed. This isolates that input's effect on the primary result. It does not predict future outcomes.
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Comparison
| Scenario | Input | Result |
|---|---|---|
| Lower input | Extra payment / month: 240 | Avalanche saves: 0.00 |
| Base example | Extra payment / month: 300 | Avalanche saves: 0.00 |
| Higher input | Extra payment / month: 360 | Avalanche saves: 0.00 |
Common mistakes
- Using the wrong units for extra payment / month.
- Comparing results while changing more than one input at a time.
- Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.
Checklist
- Confirm balances (comma separated).
- Confirm aprs % (same order).
- Confirm minimum payments.
- Confirm extra payment / month.
- Check the result against your source or provider.
Calculators Percentage Editorial Team
Calculator guides from the Calculators Percentage team. These introductory examples are educational, not professional advice.
Last reviewed:
Rates, fees, eligibility, local tax rules and provider rounding can change the final amount. Reference tax and exchange-rate data may be outdated; verify the official source before deciding.