Debt Payoff Calculator
Compare the debt snowball and debt avalanche methods to see which clears your balances sooner and cheaper.
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Quick Tip
Add each debt with its balance, interest rate and minimum payment.
About This Tool
Why use Debt Payoff Calculator?
This debt payoff calculator simulates every month of repayment across all your balances and compares the two strategies people actually use: the debt snowball, which targets the smallest balance first, and the debt avalanche, which targets the highest interest rate first.
Both methods pay the minimum on everything, then throw every spare dollar at one target debt. When that debt clears, its payment rolls onto the next. With balances of $1,200 at 24%, $4,800 at 19% and $9,000 at 12%, the avalanche attacks the 24% card first and always costs the least interest, while the snowball clears the $1,200 balance first and gives you a visible win sooner.
Key Benefits
Month-by-month simulation
Interest is applied to each balance every month and payments are allocated in strategy order, rather than using a rough average.
Snowball vs avalanche side by side
See the real cost of choosing motivation over mathematics, which is often smaller than people expect.
Tells you when the budget is too low
If your monthly budget does not cover the minimum payments, the calculator flags it instead of returning a misleading payoff date.
How to use Debt Payoff Calculator
- 1
Add each debt with its balance, interest rate and minimum payment.
- 2
Enter the total amount you can put toward debt each month — this must be at least the sum of your minimums.
- 3
Switch between snowball and avalanche to compare payoff dates and total interest.
- 4
Check the payoff order to see which debt clears first and when.
- 5
Try raising the monthly budget slightly to see how much sooner you finish.
Best use cases
Decide whether to pay off the smallest card or the most expensive one first.
See a realistic debt-free date instead of guessing.
Work out how much faster an extra $100 a month clears everything.
Check whether consolidating at a lower rate would actually beat your current plan.
How this tool compares
Debt Payoff Calculator FAQs
What is the difference between the debt snowball and the debt avalanche?
The snowball orders debts by balance, smallest first, so you clear individual accounts quickly and stay motivated. The avalanche orders them by interest rate, highest first, which mathematically always costs the least interest and usually finishes soonest. Both pay minimums on everything else.
Which method should I actually use?
The avalanche saves more money, but only if you stick with it. If the gap between the two is small — often a few hundred dollars — the snowball's early wins can be worth it, because the method you finish beats the method you abandon. Run both and let the size of the difference decide.
Why does my payoff date barely move when I add a small payment?
Early extra payments mostly offset interest that is already accruing on large balances. The effect compounds: as each debt clears, its minimum payment rolls onto the next one, so progress accelerates sharply in the later months.
Should I pay off debt or build savings first?
A common approach is to hold a small emergency fund of around one month of expenses, then attack high-interest debt aggressively, then build a fuller emergency fund. Paying down a 22% credit card is a guaranteed 22% return, which no savings account will match.
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