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About this tool
Compare snowball and avalanche debt payoff methods with interest, timeline, and payoff order insights.
The Debt Payoff Calculator runs a month-by-month simulation of every debt you enter, capped at 600 months. Each active balance is charged interest at APR ÷ 12 before any payment lands, minimums go out on all debts, and the entire remaining budget is thrown at one target debt — so cleared minimums roll forward automatically. Both orderings are simulated on every edit: avalanche sorts by highest APR first (ties broken by smaller balance), snowball by smallest balance first (ties broken by higher APR), which is how the interest and timeline gap between the two methods is shown side by side. Everything runs in your browser as React state; no balances are sent to a server and nothing is saved when you close the tab.
Open Debt Payoff Calculator on AltFTool — it loads instantly in your browser.
Enter each debt with its balance, APR and required monthly minimum — edit the four sample rows or add your own.
Set your extra monthly payment, then switch between Avalanche and Snowball to compare total interest and months to debt-free.
Read the payoff order and remaining-balance curve, then Export CSV or Copy Summary to keep the schedule.
Snowball and avalanche are simulated in parallel from the same inputs, so the interest difference and the month gap are on screen without switching modes.
Minimums are paid on every active debt first, whatever remains of the budget lands entirely on the current target, and freed-up minimums roll into the next debt.
Export CSV writes month, payment, interest, principal paid and remaining balance for every month to debt-payoff-schedule.csv, generated in the browser.
Balances, APRs and minimums live only in the page's React state. No account, no upload, and the figures are gone on reload.
Avalanche costs less interest; snowball clears individual accounts sooner. Because this calculator simulates both orders from the same inputs, the Avalanche Savings card shows the exact interest difference and the month gap for your own balances instead of a general rule of thumb.
It charges each active balance interest once per month at APR ÷ 12 before any payment is applied, then subtracts the minimum payments and routes the whole remaining budget to the target debt. Next month's interest is charged on the new balance, so it compounds monthly.
Whichever method you select. Avalanche sorts debts by APR from highest to lowest and breaks ties by the smaller balance; snowball sorts by balance from smallest to largest and breaks ties by the higher APR. Minimums are still paid on every debt under both.
Yes. Four sample debts load by default, and you can rename, edit or delete any row and add as many new ones as you need. Each debt takes a balance, an APR between 0 and 99%, and a required monthly minimum — a 0% loan from family is a valid entry.
The whole timeline recalculates the moment you change the Extra Monthly Payment field. The slider covers ₹0 to ₹1,00,000 in ₹1,000 steps and the number box accepts larger amounts; every extra rupee goes to a single target debt once all minimums are covered, which is what shortens the schedule.
It means the monthly budget never clears the balances within the 600-month (50-year) simulation limit — usually because the minimums barely cover the monthly interest. The tool flags this rather than showing an impossible debt-free date.
Yes, two ways. Export CSV downloads debt-payoff-schedule.csv with one row per month (month, payment, interest, principal paid, remaining balance). Copy Summary puts a plain-text block on your clipboard with the method, monthly budget, debt-free month, total interest, total paid and the payoff order.
Indian rupees. Amounts are formatted with the en-IN locale, so ₹1,25,000 uses lakh grouping and the debt-free date appears as a short month and year. The underlying maths is currency-agnostic — the months and interest are identical if you read the figures as any other unit.
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