Debt Snowball Calculator
Debt Snowball & Avalanche Calculator
Hi, it's Ren. Pop your debts in below and you'll see your real debt-free date, the total interest you'll pay, and whether the snowball or the avalanche method gets you there cheaper. Nothing is saved or sent anywhere, it all runs right here in your browser.
Want it to keep working after today?
Track it every week with the Complete Debt Payoff Planner
This calculator shows you the plan. The Complete Debt Payoff Planner keeps it live: snowball, avalanche and hybrid built in, your payoff date recalculating as you log each payment, in Google Sheets and Excel. Built by Ren, trusted by over 76,000 customers.
Get the Debt Payoff Planner →New to this? Start with how to pay off debt fast.
How this debt payoff calculator works
This free debt payoff calculator runs the same month-by-month maths a spreadsheet would. It adds interest to each balance, applies your minimum payments, then throws every spare dollar at one target debt until it clears.
When a debt is gone, its old payment rolls onto the next one. That rolling payment is what gives the snowball its speed, and it is why your debt-free date arrives sooner than paying minimums alone.
Switch between the snowball and avalanche methods at the top to see the trade-off in real numbers: your payoff date, the total interest, and the order each debt clears.
Debt snowball vs debt avalanche
- Debt snowball: pay the smallest balance first for a fast, motivating win, then roll that payment onward. The easiest method to stick with.
- Debt avalanche: pay the highest interest rate first to save the most money overall. Best if the maths matters to you more than quick wins.
Most people finish more often with the snowball, so pick the one you will actually keep going with.
Whichever you choose, the Complete Debt Payoff Planner runs both methods for you and adds custom debt tracking, so you can log any debt type, set your own categories, and watch every balance fall in one place.
For the full walkthrough, see how to pay off debt fast, the one-page debt tracker template, and the debt spreadsheet guide.
Frequently asked questions
Is this debt snowball calculator free?
Yes, completely. It runs in your browser, nothing is saved or sent anywhere, and there is no sign-up.
What is my debt-free date?
It is the month your last balance hits zero if you hold your plan steady. The calculator shows it the moment you enter your debts and a monthly extra payment.
Should I use the snowball or avalanche method?
Avalanche saves the most interest, while snowball clears a balance fastest for motivation. The calculator shows both so you can choose with real numbers in front of you.
How accurate is the calculator?
It assumes fixed balances, rates and payments and no new spending, so treat it as a close estimate. A live tracker that updates as you pay keeps the date accurate over time.
Estimates only, for general information and not financial advice. Results assume fixed balances, rates and payments and do not account for new spending, fees or rate changes.