Debt Avalanche Calculator
Calculate the mathematically optimal debt payoff plan by targeting highest APR debts first to save the maximum possible interest.
What this calculator does
The Debt Avalanche Calculator estimates your result instantly from the values you enter, using standard debt payoff formulas. Calculate the mathematically optimal debt payoff plan by targeting highest APR debts first to save the maximum possible interest. Calculations run in your browser, so nothing you type is sent to a server, and the output is an estimate for planning rather than financial advice.
About Debt Avalanche Calculator
The Debt Avalanche Calculator optimizes your debt repayment by directing all extra payments to the highest interest rate (APR) account first, mathematically minimizing total interest paid.
Formula & Mathematical Calculation
Avalanche Order: Sort Debts by Descending Interest Rate (APR_1 ≥ APR_2 ≥ ... ≥ APR_k)
Total Interest Saved vs Minimums = Total Interest (Minimums) - Total Interest (Avalanche)
Calculation Example
Example ($25k Debt across 24% Card, 12% Personal, 6% Auto): Avalanche method clears debt in 26 Months and saves $4,850 in interest compared to standard payoff.
Key Benefits
- Mathematically optimal strategy that saves the absolute maximum interest
- Prioritizes highest APR accounts first (20-29% credit cards)
- Compares Avalanche savings directly against Debt Snowball
- Generates month-by-month rollover payoff schedule
- Free and private debt optimization tool
How to Use this Calculator
-
List All Debts by APR
Input balance, APR, and minimum payment for each account. -
Enter Extra Monthly Contribution
Input extra cash allocated toward debt. -
Generate Avalanche Schedule
Click Calculate to view interest savings and debt-free date.
Assumptions & Limitations
What the calculation assumes
- Every value you enter is treated as an exact, known amount.
- Rates and contributions are assumed to stay constant for the whole period unless the form asks for them separately.
- Results use standard financial formulas and ignore fees, penalties and promotional terms that are not entered above.
- Inflation, tax changes and market volatility are not modelled unless a field for them is provided.
- Amounts are unit-agnostic: results are returned in the same currency you enter.
What it does not cover
- Debt Avalanche Calculator produces estimates for education and planning, not a quote, offer or professional advice.
- Real-world outcomes differ when fees, taxes, rounding rules or provider-specific terms apply.
- Local regulations and tax rules vary by country and change over time; verify current rules for your jurisdiction.
- Figures are only as accurate as the inputs you supply — check them before acting on the result.
- For decisions with lasting financial impact, confirm the numbers with a qualified professional.
Frequently Asked Questions
You May Also Need
Next step: browse the full Debt Payoff calculators or read the related guides for context before you decide.