Debt Payoff Calculator
Enter your debts and compare snowball vs avalanche strategies side-by-side. See your payoff timeline, total interest paid, and how extra payments accelerate your debt-free date.
Your Debts
Additional amount beyond minimums applied to your priority debt each month
Payoff Strategy
Debt-Free In
6 yr 3 mo
Total Interest
$7,238
Interest Saved
$4,229
Months Saved
40 months
Strategy Comparison
| Minimum Only | Avalanche | Snowball | |
|---|---|---|---|
| Time to Pay Off | 9 yr 7 mo | 6 yr 3 mo | 6 yr 3 mo |
| Total Paid | $53,468 | $49,238 | $49,238 |
| Total Interest | $11,468 | $7,238 | $7,238 |
| Interest Saved | — | $4,229 | $4,229 |
Avalanche Payoff Order
Balance Over Time (Avalanche)
Per-Debt Summary (Avalanche)
Credit Card
$5,000 @ 22.99% APR
1 yr 5 mo
to pay off
Car Loan
$12,000 @ 6.5% APR
2 yr 7 mo
to pay off
Student Loan
$25,000 @ 5.5% APR
6 yr 3 mo
to pay off
Payment Schedule
View the full 75-month payment schedule showing how each payment is applied across your 3 debts.
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How to Use the Debt Payoff Calculator
This debt payoff calculator helps you create a concrete plan to become debt-free. Start by entering each of your debts — credit cards, student loans, car loans, personal loans, or any other balance you owe. For each debt, input the current balance, the annual interest rate (APR), and the minimum monthly payment. You can add as many debts as you need using the “Add Debt” button.
Setting your extra payment: The extra monthly payment field is the key to accelerating your payoff. This is the amount beyond your total minimum payments that you can commit each month. Even a modest extra payment of $50-200 can dramatically reduce your payoff timeline and total interest. The calculator always applies this extra amount to your highest-priority debt based on the selected strategy.
Comparing strategies: Toggle between Avalanche and Snowball to see how each approach affects your timeline and total cost. The comparison table shows all three scenarios side by side — minimum payments only, avalanche, and snowball — so you can see exactly how much interest each strategy saves compared to paying only minimums. The payoff order section shows which debt gets targeted first under each strategy.
Reading the results: The balance-over-time chart visualizes your total debt declining month by month. Hover over any bar to see the exact remaining balance and which debts were paid off that month. The per-debt breakdown shows individual payoff timelines and how much interest each debt will cost you. Monthly schedule rows highlighted in gold indicate months where a debt was fully paid off — the freed-up payment then rolls into the next priority debt.
Sharing your plan: Use the share button to generate a URL that encodes all your debts and extra payment amount. You can bookmark this link to revisit your plan, share it with a partner to align on a debt payoff strategy, or save multiple URLs to compare different extra payment amounts. All calculations happen in your browser — your financial data is never sent to any server.
Frequently Asked Questions
What is the difference between snowball and avalanche methods?
The debt snowball method targets the smallest balance first regardless of interest rate, giving you quick psychological wins as debts disappear. The debt avalanche method targets the highest interest rate first, which minimizes total interest paid and often results in a faster overall payoff. Both methods keep minimum payments on all debts and direct any extra money to the priority debt. This calculator lets you compare both side-by-side so you can see the exact dollar difference.
Which debt payoff strategy is better?
Mathematically, the avalanche method always saves the most money in interest because it eliminates the most expensive debt first. However, research from Harvard Business School shows that people using the snowball method are more likely to stick with their plan because the quick wins build momentum and motivation. The best strategy is the one you will actually follow. Use this calculator to see the difference — if the interest savings between avalanche and snowball are small, go with snowball for the motivation boost.
How does extra payment affect my payoff timeline?
Extra payments beyond your minimums have a dramatic effect on your debt-free date. Even an extra $100 per month can shave years off your payoff timeline and save thousands in interest. The calculator applies your extra payment to your priority debt (smallest balance for snowball, highest rate for avalanche). When that debt is paid off, its minimum payment plus the extra rolls into the next priority debt, creating an accelerating snowball effect.
Should I pay off debt or save money first?
Most financial advisors recommend a balanced approach: first build a small emergency fund of $1,000 to $2,000 to avoid adding new debt for unexpected expenses. Then aggressively pay down high-interest debt (anything above 7-8%). Once high-interest debt is gone, build your emergency fund to 3-6 months of expenses while making minimum payments on low-interest debt. If your employer offers a 401k match, contribute enough to get the full match even while paying down debt — that match is an immediate 50-100% return.
What if I can't afford extra payments?
Even without extra payments, choosing the right strategy still matters. Set the extra payment to $0 in this calculator to see your baseline payoff timeline with minimums only. Then look for ways to free up even $25-50 per month — canceling unused subscriptions, negotiating bills, selling items you don't need, or picking up occasional side work. Small amounts compound over time. You can also call your credit card companies to negotiate lower interest rates, which reduces the total interest you pay.
How accurate is this debt payoff calculator?
This calculator provides accurate projections based on constant interest rates and consistent monthly payments. In reality, credit card rates may change with the prime rate, minimum payments on some cards decrease as balances drop (which slows payoff), and your financial situation may change. The projections work best as a planning tool to compare strategies and set goals. For the most accurate results, enter your current actual minimum payments rather than relying on percentage-based minimums, and update the calculator periodically as balances change.