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A debt payoff calculator shows you exactly when you will become debt-free by analyzing each balance, interest rate, and minimum payment you enter. It runs two popular payoff strategies, snowball and avalanche, so you can compare total interest saved and pick the approach that fits your goals. You can also add an extra monthly payment to see how even a small amount shortens your timeline and reduces the total cost of borrowing.
Compare the Debt Snowball and Debt Avalanche methods to find the fastest and cheapest way to become debt-free. Add your debts, choose a strategy, and see your personalized payoff plan.
Strategy: Debt Snowball
Pays off the smallest balance first for quick psychological wins.
Extra monthly payment: $200.00
Debt Free Date
31 months from now
Total Months
31
≈ 2.6 years
Total Interest
$2,773.43
15.87% of total paid
Total Paid
$17,473.43
Principal $14,700.00 + interest
Monthly Payment
$569.00
All minimums + extra
This calculator provides estimates for informational purposes only. Actual payoff timelines depend on payment processing, fees, and changes to your APR. Always check your statements for accurate balances and rates.
| Metric | Snowball | Avalanche |
|---|---|---|
| Months to Payoff | 31 | 31 |
| Total Interest | $2,773.43 | $2,666.17 |
| Total Paid | $17,473.43 | $17,366.17 |
| Debt Free Date |
Avalanche saves $107.26 in interest
Avalanche is mathematically optimal for minimizing total cost.
Credit Card B
$2,200.00 @ 18.90%
Credit Card A
$4,500.00 @ 22.90%
Personal Loan
$8,000.00 @ 9.50%
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The two most widely recommended payoff strategies differ in how they sort your debts, and the sorting logic directly determines how much interest you pay over time.
Debt avalanche sorts every balance by APR in descending order and attacks the highest-rate debt first. Mathematically, this minimizes total interest because the balance accruing the most expensive interest shrinks fastest. After that debt is eliminated, its minimum payment is freed up and added to the next-highest-APR debt, and so on.
Debt snowball sorts by balance in ascending order and targets the smallest debt first. The idea is behavioral: knocking out a small balance quickly creates momentum and motivation to keep going. The tradeoff is that you may pay more total interest than avalanche, because a low-balance, low-rate card might be prioritized over a high-rate card with a larger balance.
This calculator runs both strategies simultaneously, so you can compare the total months, total interest paid, and final debt-free date side by side before committing to a payoff plan.
Adding an extra monthly payment to the snowball method accelerates every debt in the chain. Here is how the math works: after covering all minimum payments, the remaining budget goes entirely to the smallest balance. That extra amount reduces the principal faster, which means less interest accrues next month, which means even more of the next payment goes to principal.
When the smallest debt reaches zero, two things happen. First, you no longer owe its minimum payment. Second, that freed-up minimum is added to the extra payment pool and redirected to the new smallest balance. This compounding effect is why extra payments feel slow at first and then accelerate dramatically toward the end of your plan.
Snowball Extra Payment Example
Three debts: Card A ($2,000 at 19%), Card B ($5,000 at 24%), Card C ($8,000 at 15%). Minimums total $350. With $150 extra, Card A receives $200/month (its $50 minimum plus $150 extra) and is paid off in roughly 11 months. In month 12, that $200 rolls to Card B, which now gets $350/month. After Card B is cleared, all $580 goes to Card C. The final months are significantly shorter than if you had paid only minimums.
The calculator handles this waterfall automatically. You enter your extra budget once, and the engine distributes it correctly for every month of the schedule.
To illustrate how the numbers work in practice, consider a single credit card with a $10,000 balance and a 22.9% APR. The monthly rate is 1.9083%. With a minimum payment of $250 per month, the first month charges $190.83 in interest and applies only $59.17 toward principal. This slow start means the balance lingers for a long time.
Paying $250/month only: At this pace, paying off $10,000 in credit card debt takes approximately 62 months (just over 5 years). Total interest paid is roughly $5,400, bringing the overall cost to about $15,400.
Adding $100 extra ($350/month): The extra payment goes straight to principal each month. At $350/month, the payoff timeline drops to approximately 37 months (just over 3 years) and total interest falls to roughly $2,800. That extra $100 per month saves you about $2,600 in interest and eliminates 25 months of payments.
The gap widens further with larger extra payments or higher rates. Use the calculator above to model your own balances and see the exact numbers for your situation.
The debt-free date is a projection computed by adding the total number of payoff months to the current calendar month. The engine works backward: it first determines how many months are required to reduce every balance to zero given your payment amounts and rates, then it counts forward from today to produce a specific target date.
Extra payments shift this date forward because they reduce the number of months in the schedule. For instance, if a no-extra plan shows a debt-free date of March 2031, adding $200/month might pull that date back to June 2029, saving nearly two years of payments. The calculator shows the date for both the snowball and avalanche strategies so you can see which method gets you there sooner.
Keep in mind that the date assumes fixed rates and fixed payment amounts. If your card issuer changes your APR or your minimum payment, the actual date could differ. The projection is most accurate for fixed-rate debts like personal loans and less precise for variable-rate credit cards over long timelines.
When you have more than one card, the payoff engine follows a specific allocation order every month. First, it pays the minimum required amount on every single debt to keep all accounts current and avoid penalties. Then, it takes whatever budget remains (your minimums plus any extra payment you specified) and directs 100% of it to the priority debt based on your chosen method.
The key moment comes when a card is fully paid off. At that point, two things change: the minimum payment you were sending to that card is freed up, and the extra payment you were applying to it is also freed up. Both amounts are added together and redirected to the next debt in the priority order. This is often called the "waterfall" or "snowball" effect, because your payment power grows with each card eliminated.
How the Waterfall Works
Suppose you have four cards with minimums totaling $400 and you add $200 extra. The priority card gets its $75 minimum plus $200 extra ($275 total). Once that card is paid off, the next card now receives its own $100 minimum plus the freed-up $275, for a total of $375 per month. After the second card is gone, the third gets $475, and so on. Each payoff accelerates the next one.
The calculator supports credit cards, personal loans, student loans, auto loans, and medical debt in any combination. Enter each debt separately with its balance, APR, and minimum, then choose snowball or avalanche to see the optimized schedule.
Browse all tools on the Debt Calculators hub, or explore our Debt Consolidation Calculator to see whether a single consolidation loan saves you money compared to keeping your debts separate. Additional tools coming soon include the DTI Calculator, Credit Card Payoff Calculator, Credit Card Minimum Payment Calculator, and Balance Transfer Calculator.