Debt Payoff Calculator
Compare the debt avalanche and debt snowball strategies for your credit cards and loans.
Your debts
Beyond the sum of your minimum payments above.
Where your extra payment goes first.
Total interest paid (avalanche)
$2,164
Debt-free in 2 yr 6 mo
Total paid
$19,164
Time to debt-free
2 yr 6 mo
Payoff order (avalanche)
Estimate calculated from the numbers you entered. This is not financial, tax, or legal advice — always consult a qualified professional before making significant financial decisions.
What the Debt Payoff Calculator measures
Enter your debts — credit cards, personal loans, car loans, anything with a balance, an interest rate, and a minimum payment — plus how much extra you can put toward them each month, and this tool simulates paying them off under both the debt avalanche and debt snowball strategies. It shows how many months until you're debt-free, the total interest you'll pay, and the order your debts get eliminated, so you can compare the two approaches with your own numbers instead of guessing.
- Avalanche — highest rate first
- Snowball — smallest balance first
How the simulation works
Each simulated month, interest accrues on every balance, the minimum payment is applied to every debt, and whatever is left of your extra monthly budget goes to a single priority debt: the highest-APR debt under avalanche, or the smallest-balance debt under snowball. Once a debt hits zero, its minimum payment doesn't disappear — it gets added to next month's extra-payment budget, so your payoff power grows every time a debt is eliminated. This rollover is what makes both methods accelerate over time instead of just chipping away at a fixed pace.
A worked example
Two debts — a $5,000 credit card at 22% APR and a $3,000 personal loan at 8% APR, each with a $100/month minimum — with $300/month extra to put toward them. Avalanche puts the $300 toward the credit card first (the higher rate), clearing it sooner and paying meaningfully less total interest than snowball, which would target the personal loan first purely because its balance is smaller.
Common mistakes when paying off debt
- Spreading extra payments across every debt evenly: this feels fair but is mathematically the slowest and most expensive approach — concentrating extra payments on one debt at a time (either strategy) beats splitting them up.
- Only ever paying the minimum: minimum payments on high-rate debt are often calculated to keep you paying for years — even a modest extra payment can cut years off a credit card balance.
- Ignoring the freed-up minimum payment after a debt is cleared: rolling that amount into your next debt's payment, rather than treating it as extra spending money, is what makes the "snowball" effect actually snowball.
- Opening new debt while paying off old debt: new charges on a card you're actively paying down undo the progress this calculator projects.
Frequently asked questions
What is the debt avalanche method?
Debt avalanche means paying the minimum on every debt, then putting every extra dollar you can toward the debt with the highest interest rate (APR) first. Once that debt is paid off, its minimum payment rolls into the extra amount you put toward the next-highest-rate debt, and so on. Mathematically, this is the strategy that minimizes the total interest you pay and gets you debt-free fastest for a given monthly budget.
What is the debt snowball method?
Debt snowball follows the same rollover mechanic, but orders debts by balance instead of rate: your extra payment goes to the smallest balance first, regardless of its interest rate. It usually costs a bit more in total interest than avalanche, but it clears individual debts faster, which many people find more motivating — popularized by financial personality Dave Ramsey as a behavioral strategy, not a mathematically optimal one.
Which strategy should I actually use?
If you mostly care about paying the least interest and can stick with a plan on spreadsheet logic alone, avalanche wins in almost every case — this calculator shows you exactly how much it saves for your specific debts. If you know from experience that seeing debts disappear one by one is what keeps you motivated to keep paying extra, snowball's psychological payoff can be worth the (usually modest) extra interest cost. Try both in this calculator and compare the numbers side by side.
Should extra payments go toward debt or into savings/investing?
It depends on the interest rate. As a rough rule of thumb, paying off a debt at a given APR is equivalent to a guaranteed, risk-free return of that APR — hard to beat with most investments after accounting for risk and taxes. Many people pay off high-rate debt (credit cards, often 18-29% APR) aggressively while still investing enough to capture any employer 401(k) match, then decide between extra debt payments and investing based on the remaining debts' rates.
Does this calculator account for balance transfers or refinancing?
No — it assumes each debt keeps its current balance, APR, and minimum payment for the life of the payoff plan. If you refinance a debt or transfer a balance to a lower-rate card partway through, re-run the calculator with the updated numbers to see the new payoff timeline.
What actually moves this number
Specific levers, and roughly what each one is worth. Not “save more” — the things that change the figure above by an amount you can measure.
Pick the method you will finish, not the cheaper one
Avalanche (highest rate first) minimizes interest. Snowball (smallest balance first) clears accounts sooner and is finished more often in practice. On typical balances the interest difference is a few hundred dollars — abandoning the plan costs far more than that.
Freeze the accounts before you start
A payoff plan and continued card use cancel out. Removing the cards from your phone wallet and any saved-card fields is the mechanical change that makes the projection real, and it is the step most plans skip.
Call and ask for a lower rate
Issuers do lower rates for customers with a good payment history who ask, and the call takes ten minutes. Two points off a $9,000 balance is about $180 a year going to principal instead of interest, for free.
Diary the end of any 0% period
A promotional rate expiring is the single most common reason a payoff plan derails, and deferred-interest offers can retroactively charge the whole period if a balance remains. Put the exact date in a calendar the day you open the offer.
What this calculator does not cover
Every calculator simplifies, and the useful thing is knowing exactly where. These are the specific gaps between this estimate and your real situation:
- It assumes rates and minimum payments stay fixed. Variable card rates move with the prime rate, and minimums are typically a percentage of the balance, so both change as you pay down.
- It does not model a promotional 0% period expiring, which is the single most common reason a real payoff plan goes off track.
- New spending on the accounts is not modeled. A payoff plan and continued card use cancel each other out.
- It compares strategies on arithmetic only. Avalanche minimizes interest; snowball clears small balances first and finishes more plans in practice. The cheaper method is not the better one if you abandon it.
For anything that turns on an exact figure, use the primary sources below or a qualified professional. How these limits are decided and disclosed is described in the editorial standards.