Debt Payoff Calculator: See Your Debt-Free Date

Mathematically, the avalanche method always wins or ties — by attacking your highest-APR debt first, it cuts the most expensive interest, so you pay less overall and usually finish sooner. The snowball method targets your smallest balance first instead, which costs a little more interest but gives you a quick 'paid off' win that keeps many people motivated. If you'll stick to the plan either way, choose avalanche to save money. If you've started and quit before, the snowball's early wins may be worth a few extra dollars in interest. This calculator shows both side by side with your real numbers so you can see exactly what motivation costs you.

Pay the highest interest rate (APR) first to save the most money — that's the avalanche method, and it's the financially optimal choice. The size of the balance doesn't change this: a dollar of 23% credit-card debt costs you far more than a dollar of 6% student-loan debt no matter which balance is bigger. The only reason to pay the smallest balance first (the snowball method) is psychological: clearing a whole debt early feels good and helps some people stay on track. Enter your debts above and the tool tells you the exact order for each strategy and the dollar difference between them.

The calculator simulates your payoff month by month. Each month it adds interest to every balance (APR ÷ 12), pays the minimum on each debt, then applies your entire extra payment to one target debt — the highest-APR one for avalanche, or the smallest-balance one for snowball. When a debt is fully paid, its old payment 'rolls over' onto the next target, which is why payoff accelerates near the end. It keeps going until every balance hits zero, and that month becomes your debt-free date. Changing your extra payment by even $25 instantly moves the date.

More than most people expect, because every extra dollar goes straight to principal and stops future interest. In the default example here, adding just $250 a month on top of the minimums clears the debt about 23 months sooner and saves over $5,600 in interest. The effect compounds: the sooner a high-APR balance is gone, the less interest every later month carries. Use the extra-payment slider above to see your own numbers — try nudging it up by $50 and watch the debt-free date jump forward.

Yes — always. Both the avalanche and snowball methods require you to make the minimum payment on every single debt every month, then put your extra money toward just one target debt. Skipping a minimum triggers late fees, penalty APRs, and credit-score damage that wipes out any gains from your strategy. This calculator builds that rule in: it pays all minimums first, then applies only the leftover extra to your target debt, exactly as you should in real life.

It depends on the interest rate. High-APR debt — credit cards at 20-25% — almost always beats investing: paying it off is a guaranteed, tax-free return equal to the APR, which the stock market can't reliably match. For low-rate debt like a 3-6% student or auto loan, the math is closer, and once you have a small emergency fund, investing the difference can come out ahead over the long run. A reasonable order for most people: build a starter emergency fund, kill high-interest debt with the avalanche method, then split extra money between low-rate debt and investing.