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Debt Payoff Calculator
List up to three debts, add any extra monthly payment, and compare the two famous payoff strategies side by side — including your exact debt-free date.
Debt 1
Debt 2 (optional)
Debt 3 (optional)
For education only — not financial advice. Assumes fixed APRs, no new charges, and no late fees.
How the snowball and avalanche work
Both strategies share one engine: pay every minimum every month, then throw all your extra money at one target debt. When that debt dies, its old minimum rolls into the attack on the next one — the payment "snowballs" bigger each month. The only difference is which debt you target first.
The snowball targets the smallest balance first. The math is slightly worse, but the psychology is unbeatable: killing a whole debt in a few months gives you a win that keeps you going. If you have quit payoff plans before, start here. The avalanche targets the highest APR first. It is mathematically optimal — every extra dollar kills the most expensive debt — and on large balances it can save hundreds or thousands in interest. The tradeoff: your first win may be a year away.
Which should you pick? We compare them head-to-head with real numbers in Debt Snowball vs. Avalanche: Which Pays Off Faster? The honest answer: the best strategy is the one you will actually stick with for the whole payoff. A perfect plan you abandon beats nothing.
Reading your results
The calculator simulates every month: interest accrues on each balance, minimums go out, and your extra payment attacks the target until it is gone — then rolls to the next. Three numbers matter. Months to debt-free is your finish line; add it to today's date and you get the debt-free date shown above. Total interest is the true price of your debt — compare it between strategies to see what the avalanche saves you. Payoff order shows the sequence each strategy clears your debts, so you know which bill to attack first this month.
Watch the extra-payment lever. Even $100 more a month on a $12,000 credit-card balance can shave a year off the payoff and cut interest by 20–30%. If you have room in your budget, raise the extra field and re-run — the difference is usually shocking. That is why the 20% savings bucket in our budget planner doubles as a debt-attack fund until balances are gone.
The average US household carrying credit-card debt pays over $1,300 a year in interest alone — more than a month's rent in many cities. Every extra dollar above the minimum attacks that number directly.
Getting debt-free even faster
1. Stop the bleeding first. No payoff plan survives new charges. Take the cards out of your wallet — literally — and switch daily spending to debit or cash while the plan runs.
2. Call your issuers. A five-minute hardship or rate-reduction call can drop a 29% APR to 15–20%. It works more often than people think, and lower interest supercharges both strategies for free.
3. Automate the minimums, manual the extra. Set every minimum on autopay so a late fee never steals a month, then manually send the extra to your target debt each payday. Automation protects you; the manual extra keeps you engaged.
4. Funnel windfalls. Tax refunds, bonuses, and side-hustle money should go straight to the target debt. One $1,500 windfall a year can cut a typical three-year plan nearly in half when combined with the monthly extra.
5. Guard the finish line. The danger month is the last one: with one debt left, the temptation to "reward yourself" is strongest. Hold the line — then redirect the entire freed payment to savings the month after. That is how debt freedom becomes wealth.
Frequently Asked Questions
Which is better: debt snowball or debt avalanche?
The avalanche always costs less in interest because it kills the highest-rate debt first. But the snowball delivers faster early wins, and research shows people using it are more likely to finish. If the interest difference between your debts is small, pick the snowball for motivation; if one debt is dramatically more expensive, the avalanche's savings are worth it.
What if I can only afford minimum payments?
Then this calculator still helps: run it with $0 extra to see your honest finish date and total interest. That number is your motivation to find even $50–$100 a month — selling unused items, a side gig, or trimming subscriptions. Small extras on top of minimums create outsized results because they cut principal, not just interest.
Should I pay off debt or save first?
Do both in order: keep a small $1,000 starter emergency fund, then throw everything at high-interest debt (anything above ~7–8%), then build a full 3–6 month emergency fund. Low-interest debt like a mortgage can coexist with investing. Credit cards at 20%+ are a financial emergency — treat them like one.
Does the calculator handle changing interest rates?
No — it assumes each debt's APR stays fixed and you add no new charges. If a rate is promotional (like a 0% balance transfer expiring in 12 months), the estimate is still useful as a baseline, but prioritize that balance before the promo ends to avoid the deferred interest.
How accurate is the debt-free date?
It is accurate if your inputs are accurate — same APRs, no new spending, no missed payments. One late fee or new charge shifts the date. Think of it as your plan's promise: follow the plan exactly and the date holds. Re-run the calculator quarterly to stay on track.