Find your debt-free date and compare the snowball vs avalanche payoff strategies side by side. Enter your balances, APRs, and minimum payments, then see exactly how much interest each strategy costs — free, private, no signup.

Debt Payoff Calculator — Snowball vs Avalanche (Free)

Debt Payoff Calculator: Snowball vs Avalanche

Enter every debt — balances, APRs, minimum payments — and see your exact debt-free date and total interest under both payoff strategies, side by side.

Your debts

Extra monthly payment toward debt ($)

How it works

You keep paying every minimum, plus this extra amount. Each paid-off debt rolls its payment into the next target until you are debt-free.

Debt Snowball

Smallest balance first — quick wins keep you motivated

—

Months to debt-free—

Total interest paid—

Total paid—

Debt Avalanche

Highest APR first — mathematically the cheapest route

—

Months to debt-free—

Total interest paid—

Total paid—

Snowball total interest

Avalanche total interest

Payoff schedule — Snowball order

#	Debt	Balance	APR	Paid off	Interest paid

Payoff schedule — Avalanche order

#	Debt	Balance	APR	Paid off	Interest paid

Estimates only. Interest is applied monthly at APR ÷ 12 on the remaining balance, and your total monthly payment stays fixed until every debt is cleared. Actual results vary with fees, rate changes, and new charges.

100% private

Every calculation runs in your browser. Your debts and payments never leave this page.

No signup

No account, no email, no download. Open the page and start planning your payoff.

Free forever

Unlimited what-if scenarios — test any extra payment amount, any time.

How to use the debt payoff calculator

1
List every debt
Type each debt’s name, current balance, APR, and minimum monthly payment. Add as many rows as you need.
2
Set your extra payment
Enter any amount above the minimums you can pay each month — even $50 changes the math dramatically.
3
Compare both strategies
Hit the button to simulate month-by-month payoff under snowball and avalanche, with your debt-free date, total interest, and full schedule for each.

Why plan your payoff this way

See your debt-free date

A concrete finish line — month and year — turns an abstract balance into a plan you can actually follow.

Know the true cost

Minimum payments hide how much interest you will really pay. This shows the full price of each strategy.

Pick your strategy with data

Avalanche is cheapest on paper, snowball wins on motivation. Compare both and choose the one you will stick with.

Test extra payments

Raise the extra amount and watch months and interest shrink — the fastest way to see what an extra $100 is worth.

Month-by-month simulation

Not a rough estimate: the calculator applies interest and payments every month, rolling freed payments forward exactly like a real payoff plan.

Private by design

Debt is personal. Nothing you type is sent anywhere — close the tab and it is gone.

Debt payoff questions, answered

Debt snowball vs avalanche — which is better?

The avalanche (highest APR first) always costs less in interest — it is mathematically optimal. The snowball (smallest balance first) costs a little more but clears a whole debt sooner, and behavioral research consistently finds that quick wins make people more likely to finish the plan. Rule of thumb: if the interest difference is small, pick snowball for the motivation; if one debt has a much higher rate, avalanche saves real money. This calculator shows you the exact dollar difference so you can decide.

How is the monthly interest calculated?

Credit cards use your APR divided by 12, applied to the remaining balance each month. A $5,000 balance at 24% APR accrues about $100 of interest in one month (5,000 × 0.24 ÷ 12). The simulation repeats this every month as balances shrink, which is why extra payments early save disproportionately more.

Will paying only the minimums ever pay off my debt?

Yes, but slowly and expensively. Minimums are usually 1–2% of the balance plus interest, so a $5,000 balance at 22% APR with minimum-only payments can take over 4 years and cost nearly $2,700 in interest. Adding even a modest extra payment can cut that time and cost dramatically — try it above.

Where does my extra payment go?

In this simulation, every extra dollar goes straight to principal on your current target debt (after all minimums are covered). In real life, confirm with your lender that extra payments are applied to principal, not counted as an early next payment.

Should I include my mortgage or student loans?

You can, but remember the strategies target one debt at a time with everything extra. Mortgages and federal student loans usually carry lower rates, so avalanche naturally puts them last. Many people run this calculator on high-interest consumer debt only and keep mortgages on their normal schedule.

What if my minimums barely cover the interest?

The calculator will warn you: if a minimum payment does not cover a month’s interest, that balance never shrinks on its own. That is the signal to raise your total payment, negotiate the rate, or talk to a nonprofit credit counselor (NFCC member agencies offer free sessions).

How accurate is this estimate?

It is a faithful month-by-month amortization at a fixed APR with a fixed total payment. Real cards vary: penalty APRs, fees, new purchases, and rate changes all shift the outcome. Treat the dates and totals as a planning baseline, not a guarantee.

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