Debt Payoff Calculator
A debt payoff calculator shows how fast you'll be debt-free and how much interest you'll pay by comparing two proven strategies — the debt snowball (smallest balance first) and the debt avalanche (highest interest rate first). Enter your balances, rates, and minimum payments below to see your personal debt-free date.
Debt Payoff Calculator
Compare the Snowball and Avalanche methods. Enter your debts to see when you'll be debt-free and how much interest you'll pay.
Snowball: pay off the smallest balance first for quick wins and momentum.
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How to use the debt payoff calculator
Enter each debt — its name, current balance, interest rate (APR), and minimum monthly payment.
Add any extra amount you can pay each month above the minimums.
Choose your method: Snowball (smallest balance first) or Avalanche (highest APR first).
See your debt-free date, the number of months, and the total interest you'll pay.
Debt snowball vs. debt avalanche
Both methods keep your total monthly payment the same — as each debt is paid off, its payment rolls over onto the next one. The difference is the order you target your debts:
Debt Snowball
Pay the smallest balance first. You clear individual debts quickly, and those early wins keep you motivated.
Best for: staying motivated
Debt Avalanche
Pay the highest interest rate first. This always costs the least total interest, though the first win can take longer.
Best for: paying the least interest
If you'll stick with the plan either way, the avalanche saves the most money. If you need momentum to stay on track, the snowball's quick wins are worth the small extra cost. This calculator shows both, so you can decide with real numbers.
How the math works
Each month, every debt is charged interest (its APR divided by 12, times the balance). Your minimum payments are applied first, then any extra — plus the freed-up payments from debts you've already cleared — goes to your target debt until it hits zero. Then the whole payment cascades to the next debt. That roll-over effect is what gets you to zero faster than paying minimums alone.
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What's the difference between the debt snowball and debt avalanche?
The debt snowball pays off your smallest balance first for quick, motivating wins. The debt avalanche pays off your highest interest rate first, which saves you the most money. This calculator shows both so you can choose.
Which debt payoff method is best?
The avalanche method always costs the least in total interest. The snowball method usually costs slightly more but gives you faster early wins, which helps many people stay motivated. If you'll stick with it either way, choose avalanche.
How is my debt-free date calculated?
The calculator applies your minimum payments plus any extra amount each month, charges monthly interest on each balance, and rolls each paid-off debt's payment onto the next debt in line until everything reaches zero.
Is this debt payoff calculator free?
Yes. The on-page calculator is completely free, and you can get a downloadable Excel and Google Sheets version free by entering your email.
Does paying extra each month really help?
Yes — significantly. Every extra dollar goes straight to principal on your target debt, which shortens your payoff time and cuts total interest. Try raising the extra monthly payment field to see the effect.
Can I use this for credit cards, loans, and other debts together?
Yes. Add any mix of credit cards, car loans, student loans, personal loans, or medical debt. Enter each balance, its interest rate, and its minimum payment, and the calculator handles them together.
