Debt Payoff

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.

Debt Avalanche Calculator Results

$0.00

Months to Debt-Free

  • Avalanche Payment on Highest-APR Debt —
  • Total Interest (Avalanche) —
  • Interest Saved vs. Minimums-Only —

What This Means

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

  1. List All Debts by APR
    Input balance, APR, and minimum payment for each account.
  2. Enter Extra Monthly Contribution
    Input extra cash allocated toward debt.
  3. 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

Debt Snowball pays smallest balances first for psychological wins. Debt Avalanche pays highest interest rates first to mathematically save the most money.

You enter up to three debts, each with its balance, interest rate, and minimum payment, plus one extra amount. The tool pays every minimum, then sends the full extra to the debt carrying the highest interest rate. When that debt clears, it rolls the freed-up payment into the next highest-rate debt, and continues down the ladder until everything is paid off.

Each debt is charged a monthly rate equal to its annual rate divided by 100 and then by 12. That charge is added to the balance every month, and the calculator steps forward month by month until each balance reaches zero.

The calculator runs the same set of debts twice: once paying only the minimums, and once adding your extra to the highest-rate debt. The gap between the two runs is the number of months and the total interest you save by directing that extra toward the highest APR first.

The debt with the highest annual rate accumulates interest the fastest, so clearing it first stops the largest interest charges the soonest. That ordering is what makes the avalanche method the least-cost route to being debt free.

Free to use, no account needed. Calculations run in your browser, so nothing you type is sent to a server. Results are estimates — how we build and check our calculators.

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