The first four rows are filled in as an example only, using the balances, minimum payments, and rates published on Calculator.net's debt payoff calculator page. Overwrite them with your own numbers, or press Reset to bring the example back.
Minimum payments come out of this first. Whatever is left goes to the debt at the top of your payoff order.
Each debt also has its own advanced fields: type, annual fee, ongoing new monthly charges, and an exclude switch. Open a row with the ⋯ button.
Snowball vs avalanche, same numbers
| Method | Debt-free in | Months | Total interest | Total paid |
|---|
Payoff order
| # | Debt | Type | Starting balance | APR | Payoff month |
|---|
Month-by-month schedule
| Month | Payment | Interest | Principal | Remaining |
|---|
How the debt snowball method works
The debt snowball method orders your debts from smallest balance to largest. You pay the minimum on every debt, then throw every extra dollar at the smallest one. When that one is gone, you take the minimum you were sending to it and roll it onto the next-smallest debt. Each paid-off debt frees up more cash flow for the next, which is where the name comes from.
How the debt avalanche method works
The debt avalanche method orders your debts from highest APR to lowest and everything else stays the same: minimums on everything, every extra dollar at the top of the list, and the freed-up minimum rolls down to the next debt. Because the extra payment always attacks your most expensive debt, the avalanche method costs you less interest whenever the two methods produce a different order.
Debt avalanche vs debt snowball
On paper the avalanche method wins on cost and the snowball method wins on momentum. Snowball clears a small balance quickly, which is a visible win early; avalanche can leave your first win months away if your highest-rate debt is also your biggest. How much that trade-off is worth depends entirely on your numbers, which is why this page runs both from the same inputs and puts the difference in front of you instead of making you guess. When both methods happen to produce the same order — common when your smallest balance is also your highest rate — the two totals come out identical, and the comparison table will say so.
What this calculator does
You enter each debt with its balance, minimum monthly payment, and APR, then say how much extra you can pay: a fixed amount every month, an amount once a year, a one-time lump sum in a specific month, or a single total monthly budget that the minimums come out of first. The calculator runs month by month — it adds any new charges, charges interest, posts the minimums, then applies the extra plus any freed-up minimums to the top of your payoff order. It stops when every balance reaches zero.
The output gives you your payoff order, time to debt-free, total interest, total principal, total paid, your largest single-month outflow, and what you save versus paying only the minimums. It also runs the other method on the same numbers and shows both side by side. Everything is available as a downloadable CSV you can open in Excel, Google Sheets, or Numbers.
How the monthly rate is derived from APR
The APR you enter is a yearly rate, so the calculator divides it by twelve to get the monthly rate: monthly rate = APR ÷ 12. An APR of 24% becomes a monthly rate of 2%. That is the simple nominal split, not the compounding conversion (1 + APR)1/12 − 1, which would produce a slightly lower monthly rate. The nominal split is the more conservative reading and it is how most US consumer disclosures are built.
Is interest charged before or after the payment
Interest is charged first, then the payment is applied. At the start of each month the calculator adds one month of interest to every balance still outstanding, and only then applies that month's payments. Your payment is always working against a balance that already includes the month's interest. This matters most when your payment barely covers the interest, because that is when a plan stops making progress.
Assumptions and limits
- Fixed minimums. Minimum payments are treated as a fixed dollar amount each month. Real credit-card minimums are usually a percentage of the balance with a floor; this calculator does not model that.
- Fixed APRs. Each debt's APR is held constant. Promotional rates that expire will change the real outcome.
- Interest before principal. Standard amortization: interest accrues on the outstanding balance before the month's payment is applied.
- Monthly compounding. Interest is applied once per month on the current balance.
- New charges are optional. If you fill in new monthly charges on a debt, those are added to the balance each month before interest accrues. Leave at $0 to model "stop using the card."
- Annual fee. If you enter an annual fee per debt, it is charged once every 12 months on that debt's balance. Late fees, cash-advance fees, and over-limit fees are not modeled.
- No penalties or cash advances. The model assumes no cash advances, no over-limit, and no late-payment penalties.
- Safety cap. If the monthly payment can never cover the monthly interest, the loop runs out to 600 months (50 years) and stops with a warning.
- Field limits. The advanced fields cap the annual fee at $200 per debt and new monthly charges at $10,000 per debt; the target is capped at 600 months. Balances and APRs are not capped — enter something extreme and the plan simply will not finish inside the safety cap.
- Single currency. All amounts are in U.S. dollars. No FX conversion.
FAQ
What is the debt snowball method?
A debt repayment strategy where you list every debt from smallest balance to largest, pay the minimum on all, and direct every extra dollar toward the smallest. When it is paid off, you roll that payment into the next debt on the list.
Is a debt snowball method calculator the same thing as a snowball calculator?
Yes. "Debt snowball method calculator," "snowball method calculator," and "snowball calculator" are three ways of describing the same tool: it sorts your debts smallest balance first, pays the minimum on everything, and rolls each freed-up minimum into the next debt. People also search for a "debt snowball spreadsheet," which is the same plan in a spreadsheet — the CSV this page downloads opens as one in Excel, Google Sheets, or Numbers.
Do you also have a debt avalanche calculator?
Yes, it is the same page. Use the Avalanche button at the top of the tool and the whole plan — payoff order, schedule, totals, and the CSV — switches to highest-APR-first. You do not need a second page or a second run to see it, because the snowball result stays in the comparison table either way.
Is an avalanche debt method calculator the same thing as an avalanche calculator?
Yes. "Avalanche debt method calculator," "avalanche method calculator," and "avalanche calculator" are three ways of saying the same thing: a calculator that orders your debts by interest rate instead of by balance. Whichever of those you came here looking for, the Avalanche button above is it.
Which method should I use?
If you want the lowest total cost, use avalanche. If you think an early visible win is what will keep you going, use snowball. The comparison table shows what the difference is worth in your own numbers, which is more useful than a rule of thumb.
How is a debt snowball calculator different from a regular debt calculator?
A generic debt calculator shows interest or a payoff date for one loan. A snowball or avalanche calculator runs across many debts at once, applies the rollover rule as each one closes, and shows the order they disappear.
What's in the downloadable spreadsheet?
A CSV file with a summary of the plan (debt-free date, total interest, total paid, savings versus minimum-only), both methods' totals for comparison, the payoff order with each debt's starting balance and payoff month, and the full month-by-month schedule showing each debt's balance every month. Open it in Excel, Google Sheets, Numbers, or any spreadsheet app.
Does it save or send my data?
No. The page runs entirely in your browser. Nothing is uploaded, stored, logged, or shared. The downloaded CSV is the only thing that leaves the page, and it only contains the numbers you typed in.
Do I need to sign up?
No. Open the page, type your numbers, get the result.
Can I use it on my phone?
Yes. The layout collapses at phone width and the numeric inputs pull up the number keypad.
Why doesn't the result match my bank's payoff date?
Most banks assume you pay only the minimum. This tool assumes you also pay the extra amount you entered. Bigger extra payment means a sooner payoff.