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Debt Avalanche Calculator
Mathematically optimize debt payoff. Target the highest-APR balance first while paying minimums on everything else, and see how much interest the avalanche method saves compared with snowball.
Avalanche method: highest APR first
Target the debt charging the highest interest rate with every extra dollar, then attack the next one. Mathematically the lowest-cost way to pay off debt.
Your debts
Add balance, APR, and minimum payment for each. Order does not matter — the strategy sorts them.
Months to debt free
42
Total interest paid
$5,086
Total amount paid
$23,286
Initial balance
$18,200
Payoff order
Credit Card A → Credit Card B → Personal Loan
vs Snowball method
Avalanche saves $572 in interest and 1 month vs the other strategy.
Monthly repayment schedule
Combined payment, interest, and remaining balance each month.
| Month | Payment | Principal | Interest | Remaining | Focus debt |
|---|---|---|---|---|---|
| 1 | $660.00 | $391.01 | $268.99 | $17,808.99 | Credit Card A |
| 2 | $660.00 | $397.43 | $262.57 | $17,411.56 | Credit Card A |
| 3 | $660.00 | $403.96 | $256.04 | $17,007.60 | Credit Card A |
| 4 | $660.00 | $410.61 | $249.39 | $16,596.99 | Credit Card A |
| 5 | $660.00 | $417.37 | $242.63 | $16,179.62 | Credit Card A |
| 6 | $660.00 | $424.26 | $235.74 | $15,755.36 | Credit Card A |
| 7 | $660.00 | $431.28 | $228.72 | $15,324.08 | Credit Card A |
| 8 | $660.00 | $438.42 | $221.58 | $14,885.66 | Credit Card A |
| 9 | $660.00 | $445.69 | $214.31 | $14,439.98 | Credit Card A |
| 10 | $660.00 | $453.09 | $206.91 | $13,986.89 | Credit Card A |
| 11 | $660.00 | $460.62 | $199.38 | $13,526.27 | Credit Card A |
| 12 | $660.00 | $468.29 | $191.71 | $13,057.98 | Credit Card A |
| 13 | $660.00 | $476.10 | $183.90 | $12,581.88 | Credit Card A |
| 14 | $660.00 | $484.05 | $175.95 | $12,097.83 | Credit Card A |
| 15 | $660.00 | $492.15 | $167.85 | $11,605.68 | Credit Card A |
| 16 | $660.00 | $500.39 | $159.61 | $11,105.29 | Credit Card A |
| 17 | $660.00 | $508.79 | $151.21 | $10,596.50 | Credit Card A |
| 18 | $660.00 | $517.33 | $142.67 | $10,079.17 | Credit Card A |
| 19 | $660.00 | $526.03 | $133.97 | $9,553.14 | Credit Card A |
| 20 | $660.00 | $534.90 | $125.10 | $9,018.24 | Credit Card A |
| 21 | $660.00 | $543.92 | $116.08 | $8,474.32 | Credit Card A |
| 22 | $660.00 | $553.11 | $106.89 | $7,921.22 | Credit Card A |
| 23 | $660.00 | $562.46 | $97.54 | $7,358.75 | Credit Card A |
| 24 | $660.00 | $571.99 | $88.01 | $6,786.76 | Credit Card A |
| 25 | $524.05 | $445.74 | $78.31 | $6,341.02 | Credit Card B |
| 26 | $465.00 | $392.93 | $72.07 | $5,948.08 | Credit Card B |
| 27 | $465.00 | $398.04 | $66.96 | $5,550.05 | Credit Card B |
| 28 | $465.00 | $403.21 | $61.79 | $5,146.84 | Credit Card B |
| 29 | $465.00 | $408.45 | $56.55 | $4,738.39 | Credit Card B |
| 30 | $465.00 | $413.76 | $51.24 | $4,324.63 | Credit Card B |
| 31 | $465.00 | $419.15 | $45.85 | $3,905.48 | Credit Card B |
| 32 | $465.00 | $424.61 | $40.39 | $3,480.87 | Credit Card B |
| 33 | $433.23 | $398.37 | $34.86 | $3,082.50 | Personal Loan |
| 34 | $370.00 | $339.43 | $30.57 | $2,743.07 | Personal Loan |
| 35 | $370.00 | $342.80 | $27.20 | $2,400.27 | Personal Loan |
| 36 | $370.00 | $346.20 | $23.80 | $2,054.07 | Personal Loan |
| 37 | $370.00 | $349.63 | $20.37 | $1,704.44 | Personal Loan |
| 38 | $370.00 | $353.10 | $16.90 | $1,351.35 | Personal Loan |
| 39 | $370.00 | $356.60 | $13.40 | $994.75 | Personal Loan |
| 40 | $370.00 | $360.14 | $9.86 | $634.61 | Personal Loan |
| 41 | $370.00 | $363.71 | $6.29 | $270.90 | Personal Loan |
| 42 | $273.59 | $270.90 | $2.69 | $0.00 | All debts paid |
EveryCalc calculators are designed for fast, practical estimates with transparent inputs and no required account. We use plain formulas, visible assumptions, and related tools so visitors can check the result from more than one angle.
Results are informational only. For financial, tax, legal, medical, construction, or other high-impact decisions, verify the output against primary sources or a qualified professional.
Learn more about our review process on the EveryCalc methodology page.
How this calculator works
What this page estimates
This Debt Avalanche Calculator is built to give a quick, browser-based estimate for debt avalanche. Mathematically optimize debt payoff. Target the highest-APR balance first while paying minimums on everything else, and see how much interest the avalanche method saves compared with snowball. The inputs stay on the page during normal use, and the result should be treated as an estimate for planning, comparison, or education rather than professional advice.
Calculation approach
The calculator applies the standard relationship implied by the inputs, then formats the answer so it can be checked and reused. For finance tools, the most important step is using consistent units, rates, time periods, and assumptions before comparing the result with another calculator or outside quote.
Example workflow
For example, start with a realistic value you already know, change one input at a time, and watch how the answer moves. That makes it easier to tell whether the result is being driven by the main amount, the rate, the time period, or a unit conversion.
Practical checks
- Use current, real-world numbers when the result affects money, health, tax, or legal decisions.
- Run a low, base, and high case when the inputs are estimates.
- Check the related calculators below when the next decision depends on a different assumption.
How to interpret the debt avalanche result
Best use
Use the result as a planning number for comparing payments, rates, returns, tax reserves, or cash-flow choices before you request a quote or make a commitment.
Cross-check
Compare the answer with the contract, lender estimate, tax form, brokerage statement, payroll record, or invoice that will control the real-world outcome.
Watch for
Do not rely on a single optimistic rate, return, or fee assumption. Money pages work best when you run low, base, and high cases and keep professional advice separate from the estimate.
This page belongs to the Finance calculator library, so the answer should be read in the context of the decision you are modeling rather than as a universal rule.
Before relying on this debt avalanche estimate
Most calculator mistakes come from the inputs, not the arithmetic. Use this short audit before you reuse the answer in a spreadsheet, quote, application, or important conversation.
Confirm source numbers
Match balances, rates, fees, taxes, income, and payment dates against the lender quote, payroll record, tax form, statement, invoice, or contract.
Separate cash flow from total cost
A lower monthly payment can still cost more over time if fees, interest, taxes, or a longer term are hidden in the structure.
Run conservative cases
Test at least one higher-cost or lower-return case before using the output for a purchase, refinance, investment, loan, or tax decision.
Rerun this page when the rate, price, term, fee, tax rule, income, expense, or expected holding period changes.
How to Use
- Enter each debt with its current balance, APR, and minimum monthly payment.
- Add any extra monthly amount you can deploy beyond the combined minimums.
- Review the payoff order — avalanche sorts by highest APR first, not by balance.
- Compare the avalanche total interest with snowball to see exactly how much interest you save.
- Use the monthly schedule to track the focus debt and remaining balance each month until debt free.
Frequently Asked Questions
Why does avalanche save the most interest?
Interest is a percentage of remaining balance. Knocking down the debt with the highest interest rate first means fewer dollars are ever charged at that high rate, which reduces total interest over the payoff period.
When does snowball beat avalanche?
Snowball beats avalanche when the psychological wins are what keep you going. If you've stalled on previous payoff attempts, snowball's quick wins often produce a better real-world result than avalanche's theoretically optimal math.
Should the avalanche include my mortgage or student loans?
Usually no for mortgage debt — low rate, long term. Student loans are worth including if their APR is higher than your other debts. Run the math both ways with this tool to see the impact.
What if two debts have the same APR?
Most people break the tie by attacking the smaller balance first (a mini-snowball), since payoff frees up that minimum payment to attack the remaining debt.
Related Calculators
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Debt Consolidation Calculator
Consolidate debts into a single lower-rate loan before running the avalanche.
Credit Card Interest Calculator
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Personal Loan vs Credit Card Calculator
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