Debt payoff calculator
Debt Snowball Calculator: Compare Your Payoff Options
Have one debt or several? Enter the numbers once to estimate your debt-free date, total interest and what extra payments could change. If you have multiple debts, you can also compare snowball and avalanche side by side.
Add the debt you want to pay off
Use one card if you only have one debt. Add more cards if you want to compare payoff order across several debts.
Add anything extra you can realistically pay
Extra monthly payments are added on top of the minimum payments above. A lump sum is treated as an immediate payment before the monthly payoff schedule begins.
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What if you paid a little more?
These scenarios rerun your debts using a higher monthly payment. Tap one to make it your new plan.
How to use the calculator
Start with the numbers on your current statements
The calculator is designed to answer two different questions: how long one debt could take to pay off, and—when you have several debts—whether changing the payoff order meaningfully changes the result.
Add each balance
Enter what you currently owe on each account. You do not need several debts to use the calculator. One balance is enough to build a payoff estimate.
Enter the APR
Use the annual percentage rate shown on the account or statement. Enter 0 if the balance currently has a genuine 0% rate.
Enter the minimum payment
This gives the model a starting monthly debt budget. When one debt disappears, its freed payment stays in the plan rather than disappearing from the budget.
Test extra payments
Add a realistic monthly amount or a one-time lump sum to see whether it changes your payoff date or modeled interest enough to matter.
Only have one debt? That is completely fine.
Snowball and avalanche only differ when there is more than one balance to prioritize. With one debt, both strategies produce the same payoff path.
In that case, the useful questions are simpler: how long will this take, how much interest could I pay, and what happens if I increase the payment?
Multiple debts
What changes between snowball and avalanche?
The monthly debt budget stays the same. The difference is which remaining debt receives the available extra money first.
Smallest balance first
Minimum payments continue on the other debts. Extra money targets the smallest balance. Once that account reaches zero, its payment rolls to the next-smallest balance.
Highest APR first
Minimum payments continue on the other debts. Extra money targets the highest interest rate first, then moves to the next-highest rate after that balance is cleared.
For the deeper strategy decision—including when a quicker first payoff may matter more to you than the lowest modeled interest—read Debt Snowball vs Avalanche .
A worked example
Suppose you have three debts and can pay $150 per month above the required minimums.
$12,600 total debt
| Debt | Balance | APR | Minimum |
|---|---|---|---|
| Store card | $900 | 18.99% | $35 |
| Credit card | $4,200 | 24.99% | $125 |
| Personal loan | $7,500 | 10.50% | $240 |
In the calculator’s monthly model, both methods finish at roughly month 28. Snowball clears the $900 balance first, around month 6. Avalanche attacks the 24.99% credit card first and produces about $71 less modeled interest overall.
That example is useful because the payoff date alone does not tell the whole story. Two plans can finish in the same month while producing different interest costs and very different first-payoff timing.
What each result actually means
The estimated month when the modeled balances reach zero if the entered rates and payment budget stay unchanged.
The interest accumulated by the monthly model over the payoff period. This is useful for comparing scenarios, but it will not exactly reproduce every lender statement.
The first account estimated to reach zero. This can be very different between snowball and avalanche even when their final debt-free dates are close.
The modeled reduction in interest from your entered extra monthly payment compared with using the same debts and lump sum but no additional monthly payment.
The sequence in which the balances reach zero under each strategy. It helps show where the two methods actually diverge.
Why your real lender result can differ
This calculator uses a transparent monthly interest estimate: remaining balance × APR ÷ 12. Real credit cards and loans can use daily interest, changing minimum-payment formulas, fees, promotional periods, variable APRs and statement-cycle rules.
The calculator is best used to compare payoff scenarios—not to replace an official lender payoff quote.
The underlying snowball and highest-interest payoff approaches are also described in Consumer Financial Protection Bureau debt-reduction guidance .
Frequently asked questions
Can I use this calculator with only one debt?
Yes. Enter just one debt and leave the other cards blank. The calculator will show one payoff plan because snowball and avalanche are identical when there is only one balance.
Do I have to fill all three debt cards?
No. Blank cards are ignored. They are shown initially so someone with several debts can start entering them without repeatedly clicking an add button.
Can I add more than three debts?
Yes. Use “Add another debt” to compare up to 12 balances.
What happens if I enter $0 as my extra payment?
The calculator still builds a payoff plan using the total of the minimum payments you entered. As debts disappear, that starting monthly debt budget continues to roll toward the balances that remain.
Is snowball always faster than avalanche?
No. The exact timing depends on the balances, APRs, minimum payments and monthly budget. Sometimes the final payoff month is the same while interest and first-payoff timing differ.
Why does the calculator ask for minimum payments?
They help define your current monthly debt commitment. The model pays those required amounts first, then directs remaining budget according to the selected payoff strategy.