Debt Payoff Calculator — Snowball vs Avalanche

How it works

Enter each debt you owe — credit cards, personal loans, car loans, student loans, medical bills — with its current balance, interest rate (APR), and the minimum monthly payment your lender requires. Then add any extra amount you can pay each month beyond the minimums. The calculator instantly builds a payoff plan and shows exactly when you'll be debt-free and how much interest you'll pay.

It uses the rollover (or "stacking") method: you keep your total monthly payment constant, and every time one debt is cleared, the money that was going to it rolls onto the next target debt. This is what makes both the snowball and avalanche strategies accelerate over time.

Debt snowball vs. debt avalanche: what's the difference?

Both methods make the minimum payment on every debt. The only difference is where your extra money goes first.

The debt snowball method

You attack the smallest balance first, regardless of interest rate. Clearing a whole debt quickly gives a motivating "win" that helps many people stay on track. Research on consumer behavior has repeatedly found that people who feel early progress are more likely to finish paying off all their debt.

The debt avalanche method

You attack the highest interest rate (APR) first. Because high-rate debt grows fastest, killing it first mathematically minimizes the total interest you pay and usually clears all your debt sooner. This calculator shows you the exact dollar difference between the two so you can decide whether the avalanche's savings are worth giving up the snowball's quick wins.

Which should you choose?

If the interest savings between the two are small, pick the snowball — momentum matters more than a few dollars. If the avalanche saves you hundreds or thousands, and you're confident you'll stick with the plan, the math favors the avalanche. Use the comparison above to see your real numbers.

Tips to pay off debt faster

• Find extra money to throw at debt. Even an extra $50–$100 a month dramatically shortens your timeline — try it in the calculator and watch the debt-free date move.
• Call and ask for a lower APR. A single phone call to lower a credit card's rate can save hundreds in interest. Re-run the numbers with the new APR.
• Avoid adding new debt while you're paying down the old balances, so your progress isn't undone.
• Consider a balance transfer or consolidation only if it lowers your overall interest rate and you have a plan to pay it off.
• Automate payments so you never miss a due date and never pay a late fee.

Debt payoff guides

Want to go deeper? These plain-English guides walk through the strategy behind the numbers:

• Debt snowball vs. avalanche: which method is better?
• How to pay off $10,000 in credit card debt
• Which debt should you pay off first?

Frequently asked questions

Is this debt payoff calculator really free?

Yes — it's completely free and there's no sign-up. Every calculation runs locally in your browser, so your balances and rates are never uploaded anywhere.

What is the debt snowball method?

It's a payoff strategy where you put all extra money toward your smallest balance first while paying minimums on the rest, then roll that payment to the next-smallest debt once it's gone.

What is the debt avalanche method?

It's a strategy where you target the debt with the highest interest rate first. It minimizes total interest and is usually the fastest, lowest-cost route to becoming debt-free.

Does the calculator account for interest?

Yes. Interest is compounded monthly on each debt using its APR, which is how most credit cards and loans actually charge interest. The schedule shows your real payoff timeline including interest.

Will paying extra each month really help that much?

Almost always, yes — especially on high-interest debt. Because interest compounds, every extra dollar today removes future interest. Try increasing the "extra monthly payment" field to see the impact.