Borrowing
Debt payoff calculator: avalanche and snowball
Compare debt avalanche, snowball and consolidation payoff plans. Include promotional rates, minimum payments, transfer fees and protected emergency cash.
Content updated . Assumptions reviewed .
Your inputs
Showing the example. Edit your inputs, then calculate.
Debt-free month
20 months
Debt-free month under the entered rates, minimum payments and cash floor.
- Total Interest
- 990.03
- Total Fees
- 0
- Remaining Balance
- 0
- Minimum Payment Shortfall
- 0
- Initial Cash Used
- 0
- Emergency Cash Remaining
- 0
- Avalanche Months
- 20
- Avalanche Interest
- 990.03
- Snowball Months
- 21
- Snowball Interest
- 1,128.75
- Consolidation Months
- 19
- Consolidation Interest
- 468.24
- Consolidation Fees
- 0
Illustrative result from your inputs and the dated assumptions shown; not a forecast, recommendation or offer
KlarFort is not financial, investment, tax, or legal advice. Verify outputs before making material decisions. Read the disclaimer.
Personal and commercial use is free with credit to KlarFort. See usage and credit.
About this calculator
Estimate when several debts could be cleared using a fixed monthly payment budget. Compare avalanche, which prioritizes the highest current rate, with snowball, which prioritizes the smallest balance, and an entered consolidation loan.
Add promotional expiry dates, minimum-payment rules and transfer fees for each debt. Cash above your protected emergency amount can reduce the opening debt before monthly payments begin.
How to use this calculator
- Add each debt balance, standard rate and minimum-payment rule. Enter promotion and transfer-fee details only when they apply.
- Set the starting month, total monthly debt budget and maximum projection period.
- Enter available cash and the emergency amount to keep, then add consolidation terms for that comparison.
- Choose a strategy and calculate. Compare payoff months, interest, fees and any minimum-payment shortfall.
Understand your result
Debt-free month is the first month every modeled balance is cleared. When a debt is paid off, the same total monthly budget becomes available for the remaining debts.
An unavailable payoff month can mean the budget fails to cover required minimums or the debt remains at the end of the chosen horizon. Check the shortfall and remaining balance to distinguish these cases.
Questions about this calculator
How do avalanche and snowball allocate extra money?
Both pay the entered minimums first. Avalanche sends the remaining budget to the highest current interest rate, while snowball starts with the smallest remaining balance. Ties keep the order in which debts were entered.
When does a promotional interest rate expire?
The standard rate applies from the beginning of the entered expiry month. Leave the expiry field empty when there is no promotion. The model recalculates avalanche priorities as rates change.
What happens to the emergency cash amount?
Only available cash above that floor is used for initial repayment. The reserve is not replenished by the calculator, and the model does not add delinquency fees when the monthly budget is insufficient.
Where do my figures go?
Your page calculations run in this browser. The API and connected assistants send the inputs supplied to them to our Cloudflare Worker. See Privacy.
How can I reproduce this result?
Use the same inputs and assumptions shown here. Simulation seeds reproduce the same paths. Read the calculation documentation.
Your calculation table
| Month | Payment | Interest | Remaining Balance |
|---|---|---|---|
| 1 | 400 | 95 | 6,695 |
| 2 | 400 | 90.58 | 6,385.58 |
| 3 | 400 | 86.09 | 6,071.66 |
| 4 | 400 | 81.53 | 5,753.19 |
| 5 | 400 | 76.91 | 5,430.1 |
| 6 | 400 | 72.22 | 5,102.31 |
| 7 | 400 | 67.46 | 4,769.77 |
| 8 | 400 | 62.63 | 4,432.4 |
| 9 | 400 | 57.73 | 4,090.13 |
| 10 | 400 | 52.76 | 3,742.89 |
| 11 | 400 | 47.71 | 3,390.6 |
| 12 | 400 | 42.59 | 3,033.19 |
| 13 | 400 | 37.4 | 2,670.59 |
| 14 | 400 | 32.13 | 2,302.72 |
| 15 | 400 | 26.78 | 1,929.51 |
| 16 | 400 | 21.36 | 1,550.86 |
| 17 | 400 | 15.85 | 1,166.71 |
| 18 | 400 | 11.67 | 778.38 |
| 19 | 400 | 7.78 | 386.16 |
| 20 | 390.03 | 3.86 | 0 |
Citable worked example
Debt payoff calculator: avalanche and snowball: fixed public worked-example outputs using the calculator’s published default inputs. Compare debt avalanche, snowball and consolidation payoff plans. Include promotional rates, minimum payments, transfer fees and protected emergency cash. These illustrative figures are independent of visitor inputs and live market feeds. The table contains 20 rows and is available as CSV and JSON. Formula and assumptions reviewed 2026-09-07.
These are fixed public examples. Your calculation above does not change this table.
| Month | Payment | Interest | Remaining Balance |
|---|---|---|---|
| 1 | 400 | 95 | 6,695 |
| 2 | 400 | 90.58 | 6,385.58 |
| 3 | 400 | 86.09 | 6,071.66 |
| 4 | 400 | 81.53 | 5,753.19 |
| 5 | 400 | 76.91 | 5,430.1 |
| 6 | 400 | 72.22 | 5,102.31 |
| 7 | 400 | 67.46 | 4,769.77 |
| 8 | 400 | 62.63 | 4,432.4 |
| 9 | 400 | 57.73 | 4,090.13 |
| 10 | 400 | 52.76 | 3,742.89 |
| 11 | 400 | 47.71 | 3,390.6 |
| 12 | 400 | 42.59 | 3,033.19 |
| 13 | 400 | 37.4 | 2,670.59 |
| 14 | 400 | 32.13 | 2,302.72 |
| 15 | 400 | 26.78 | 1,929.51 |
| 16 | 400 | 21.36 | 1,550.86 |
| 17 | 400 | 15.85 | 1,166.71 |
| 18 | 400 | 11.67 | 778.38 |
| 19 | 400 | 7.78 | 386.16 |
| 20 | 390.03 | 3.86 | 0 |
Computed with KlarFort Calculators, https://klarfort.com/
Calculator reference: https://klarfort.com/tools/debt-payoff-calculator/. Usage and credit.
Formula and assumptions
Monthly balance = prior balance + interest - minimum payment - allocated surplus.
- Promotions end at the beginning of the expiry month. Monthly APR/12 interest is charged before payments.
- Percent minimums apply to the balance including current interest; interest-plus-percent uses interest plus the opening principal percentage; each has an entered cash floor.
- The fixed monthly budget rolls freed payments into the next debt. Rate or balance ties retain input order.
- Transfer fees are capitalized once at the start; consolidation adds its separate fee and contractual amortizing minimum.
- Only cash above the emergency floor repays debt immediately. Insufficient minimum-payment budgets are reported without simulating delinquency fees.
- Consolidation represents one new loan; no eligibility, credit score, tax or legal consequences are modeled.
Assumptions reviewed:
Sources
- KlarFort calculator methodology. KlarFort-authored arithmetic; free to use with credit.; vintage 1.
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