Plan Your Debt Payoff

How This Debt Payoff Calculator Works

You enter every debt you carry: the balance, the annual interest rate, and the minimum monthly payment. Add the extra amount you can put toward debt each month and, optionally, a one-time lump sum. The calculator then runs a month-by-month simulation of three payoff plans: paying only minimums, the avalanche method, and the snowball method, and shows your projected debt-free date, total interest, payoff order, and a full schedule for each one.

Each month the simulation adds the monthly interest to every open balance, applies each minimum payment, then sends your entire extra budget at one target debt. When a debt is cleared, its old minimum payment rolls into the pool attacking the next debt. That rollover is what makes well-known payoff methods work, and it is why a simple average does not describe your real timeline.

Snowball vs Avalanche

The avalanche method always targets the debt with the highest interest rate, which normally minimizes the total interest you pay and gets you debt-free the fastest. The snowball method targets the smallest balance first, which produces quick wins and keeps many people motivated enough to finish. The right choice depends on whether you are more driven by saving money or by visible progress. This calculator shows the actual dollar difference for your exact debts rather than quoting rules of thumb.

Why AI Chatbots Cannot Replace This Tool

Large language models are unreliable at multi-debt payoff math. They frequently invent payoff dates, apply minimum payments to the wrong accounts, ignore how freed-up minimums roll to the next debt, and give different answers to the same question in separate chats. This tool runs a deterministic simulation with exact cents, standard monthly interest accrual, and no approximation, so the same inputs always produce the same schedule.

How to Use It

  1. Add each debt with its current balance, APR, and minimum payment from your latest statement.
  2. Enter the extra monthly amount you can afford above your minimums, even 25 dollars a month helps.
  3. Add a one-time lump sum if you recently received a bonus or tax refund.
  4. Click Calculate and compare the avalanche, snowball, and minimums-only timelines.

Frequently Asked Questions

Is the avalanche method always better?

Mathematically, the avalanche method (highest interest rate first) minimizes total interest and usually reaches debt-free faster. Behavioral research shows many people stick with the snowball method (smallest balance first) because it delivers early wins that keep motivation high. The best method is the one you will actually follow, and this calculator shows the real dollar difference between them for your specific debts.

How are monthly interest and payments calculated?

Each debt accrues monthly interest equal to balance times APR divided by 12, added before the payment is applied. Minimum payments are applied to every open debt, then all extra money goes to one target debt. When a debt is paid off, its minimum payment is added to the pool for the next debt. This is the same month-by-month model used by major debt planning tools.

What if my minimum payment does not cover the interest?

When a payment is smaller than the monthly interest, the balance grows instead of shrinking. This calculator flags those accounts and, if the plan cannot finish within a reasonable horizon, reports that the debt will never be paid off at the current payment level. The fix is usually a higher payment or a lower interest rate.

How much does an extra payment help?

Even a modest extra payment shortens the timeline noticeably because it reduces principal that would otherwise keep accruing interest. The first extra dollar has the largest effect, and the freed-up minimums compounding onto the next debt accelerate the whole plan. Run the calculator with and without your extra to see the months and interest saved.

Does this save my financial data?

No. Every calculation happens inside your browser. Nothing is uploaded, stored, or transmitted. You can confirm this by opening the developer tools network tab while using the calculator, which shows no outgoing requests.

Is the debt-free date exact?

The projection uses standard monthly interest accrual in the same way lenders and planning tools do, so it is accurate within a month for typical debts. Real results can shift slightly because of due-date timing, rate changes, or extra charges, so rerun the plan whenever your balances change.