Debt Payoff Calculator
See exactly when you'll be debt-free and how much interest you'll pay — add your debts, set an extra monthly payment, and compare the snowball and avalanche methods side by side.
Debt-free by September 2028
Time to debt-free
2 yr 3 mo
Total interest
$2,839
Starting balance
$10,800
Interest saved
$3,903
vs paying minimums only
Debt-free sooner
2 yr 8 mo
earlier than minimums
Snowball vs. avalanche on these debts
| Method | Debt-free | Total interest |
|---|---|---|
| Avalanche | Sep 2028 | $2,839 |
| Snowball | Oct 2028 | $3,151 |
Avalanche saves $312 in interest here — snowball clears smaller balances first for motivation.
Track this payoff plan automatically as you budget.
BudgetLabs forecasts your debt-free date live as your balances change — free, no card.
Start a free budgetEstimates only. Interest accrues monthly on each balance; real lender terms (daily interest, fees, promo rates) will vary.
How the debt payoff calculator works
Every month, two things happen to a debt: interest gets added, and your payment gets subtracted. This calculator runs that loop forward, month by month, for every debt you enter. Interest accrues on each balance at its APR ÷ 12, your minimum payment comes off each debt, and then every extra dollar you can spare is aimed at a single target debt until it's gone.
The key move is the rollover. When one debt is paid off, the money that used to cover its minimum doesn't disappear — it gets added to the pile attacking the next debt. That snowballing payment is what makes a fixed monthly budget clear debt faster and faster over time. It's also why paying a little extra early is worth so much: it compounds against you when you don't, and for you when you do.
Avalanche vs. snowball
The only difference between the two methods is which debt gets the extra money first:
- Avalanche targets the highest APRfirst. Because interest is what makes debt expensive, killing the highest rate first always costs the least total interest and reaches debt-free fastest. It's the mathematically optimal order.
- Snowball targets the smallest balance first. You clear whole debts sooner, which delivers quick wins and a shrinking list of accounts. It usually costs slightly more interest, but for many people the motivation is worth it.
Run both above on your real balances. If avalanche only saves you a small amount, the snowball's momentum may keep you going — and the best debt-payoff method is the one you actually stick with. For a deeper breakdown, see debt snowball vs. avalanche.
How to use the results
Find an extra payment you can sustain — even $50/month moves your debt-free date noticeably — then commit to it. The trap with debt is that paying only minimums on high-APR balances can mean years of payments that barely touch the principal. Seeing the debt-free date move when you add an extra payment is usually motivation enough to find the money in your budget. The next step is making sure that extra payment is actually planned each month, which is what zero-based budgeting is for.
Frequently asked questions
How does the debt payoff calculator work?
Enter each debt’s balance, APR, and minimum payment, then add any extra you can pay monthly. The calculator accrues interest monthly, pays minimums on every debt, and throws all extra money plus any freed-up minimums at one target debt at a time — the highest-APR debt (avalanche) or the smallest balance (snowball). It returns your debt-free date and total interest for each method.
Which is better, the debt snowball or the avalanche?
The avalanche method (highest interest rate first) always costs the least interest and clears debt fastest, mathematically. The snowball method (smallest balance first) usually costs a little more but clears individual debts sooner, which many people find more motivating. Run both above on your real numbers — if the interest difference is small, the snowball’s momentum may be worth it.
What is the fastest way to pay off debt?
Pay every minimum on time, then put every extra dollar toward your highest-APR debt (the avalanche). When that debt is gone, roll its entire payment into the next one. The same monthly amount clears your debt faster over time because more of it hits principal instead of interest.
Does this calculator store my financial data?
No. Everything runs in your browser — nothing you type is sent to a server or saved. If you want your payoff plan to update automatically as your balances change, that lives in the BudgetLabs app, where debt forecasting is built in.
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BudgetLabs forecasts your debt-free date live — snowball, avalanche, or custom — as your balances change. Free tier, no card, no trial clock.
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