Debt Payoff Calculator
The two fastest ways out of debt are the avalanche method (highest interest first, least total interest) and the snowball method (smallest balance first, quickest wins). Enter your debts to see a payoff date, total interest and month‑by‑month plan.
List your credit cards and loans — balance, minimum payment and interest rate — and see how many months until you are debt-free, the total interest, and the fastest payoff order. Choose the avalanche method (lowest interest) or the snowball method (smallest balance first), add any extra payments, and open a full amortization schedule. Paying only the minimum keeps you in debt for years, so the calculator also shows your debt-free date and how much faster extra payments clear a credit-card balance.
Works for credit cards, car loans, student loans, personal loans and a mortgage together, in any currency. Estimates only, not financial advice.
Enter your debts, add any extra payment, choose a payment style, then press Calculate.
Payoff schedule
Your combined debt balance shrinking month by month until it reaches zero.
How the payoff plan is built
The calculator treats all of your debts as one plan. Each month it adds interest to every balance, pays the minimum on each one, then takes whatever money is left over — including your extra payment — and throws it at the debt with the highest interest rate. The moment a debt hits zero, the payment that was clearing it rolls onto the next debt in line. That rolling effect is what clears everything far faster than paying minimums alone.
Avalanche vs snowball
There are two popular payoff orders, and you can switch between them here with one tap. The avalanche method targets the highest interest rate first, which mathematically costs the least interest. The snowball method targets the smallest balance first; you clear individual debts sooner, which many people find motivating, but you usually pay a little more interest overall. For most households the difference is modest — the biggest win by far is simply adding something extra each month and staying consistent.
Estimates only — not financial advice. Real statements vary with rate changes, fees and the timing of payments.
Keep the total fixed, or let it shrink
Keeping your total payment fixed is the powerful part. If you were paying, say, $2,600 across all your debts, keep paying $2,600 even as debts disappear — the freed-up minimums pile onto the remaining balances and crush them. If instead you let the total drop each time a debt clears, you will still get out of debt, just more slowly and with more interest. This calculator lets you compare both with one switch.
Ways to get out of debt sooner
- Add a fixed extra each month. Even a modest, consistent top-up goes entirely to principal and compounds into big interest savings.
- Throw windfalls at it. Tax refunds, bonuses and gifts entered as a yearly or one-time payment shorten the plan immediately.
- Lower your rates. A balance transfer or a lower-rate personal loan reduces the interest working against you, and for a large loan refinancing can do the same — re-enter the new rate to see the effect.
- Keep the total steady. Resist the urge to spend a freed-up minimum; let it roll onto the next debt.
The formula behind it
Every debt is handled with two steps each month: interest is added to the balance, then a payment is taken off. The monthly interest rate is the annual rate divided by twelve.
Monthly interest, then the new balance
- B current balance r annual interest rate payment = the minimum plus any extra directed here
For a single debt paid at a fixed amount, the number of months to clear it has a closed form:
Months to pay off one balance
- B balance i monthly rate (r ÷ 12) P monthly payment n months
Worked example — a $6,000 card at 18.99% with a $150 minimum, receiving $250 a month (its minimum plus a $100 extra):
i = 0.1899 / 12 = 0.0158250
month 1 interest = 6000 × 0.0158250 = $94.95
balance after payment = 6000 + 94.95 − 250 = $5,844.95
n = −ln(1 − 6000 × 0.0158250 / 250) / ln(1.0158250) ≈ 31 months, about $1,607 interest
How to use it & key terms
Enter your debts and the monthly amount you can pay, choose snowball or avalanche, then press Calculate to see your payoff date and interest saved.
| Term | What it means |
|---|---|
| Snowball method | Pay the smallest balance first for quick wins and motivation. |
| Avalanche method | Pay the highest-rate debt first to save the most interest. |
| Minimum payment | The smallest amount due each month to stay current. |
| Extra payment | Anything above the minimum, which speeds up payoff dramatically. |
| Principal vs interest | The part of a payment that clears the debt vs the lender's charge. |
| Payoff date | When your last debt reaches zero. |
Sources & methodology
The plan is a month-by-month simulation. Each month, interest is added to every balance at its rate divided by twelve, minimum payments are applied, and the remaining budget (plus any extra) is directed by the method you choose — avalanche (highest interest rate first) or snowball (smallest balance first) — cascading to the next debt as each one clears. With the total kept fixed, freed-up minimums are reused; otherwise the monthly total falls as debts are paid off. Figures may differ from a lender's statement by a few cents due to rounding and payment timing.
Sources: Debt avalanche (highest-interest-first) repayment method; standard monthly interest accrual.
The habits that keep a payoff plan on track
A payoff plan is only as strong as the habits around it. The calculator can show a debt-free date, but that date assumes you keep paying the same total every month and stop adding to the pile. In practice the biggest threat to a plan is rarely the interest rate — it is a surprise expense that lands back on a card, quietly resetting the progress you have made. A few simple habits protect the schedule far more than shaving a fraction off any single rate.
Start by making the plan automatic. Set every minimum to pay itself, then schedule the extra amount to move on the same day your pay arrives, before it can be spent elsewhere. Automation removes the monthly decision, and the temptation that comes with it. Alongside that, keep a small starter cushion of cash: even a modest buffer means a flat tyre or a dental bill is an inconvenience rather than a reason to borrow again. Without that buffer, every emergency undoes weeks of effort.
Momentum is the quiet engine of any payoff plan. Each time a balance reaches zero its payment does not disappear — it rolls onto the next debt, so the plan speeds up on its own as you go. Watching accounts close one by one is genuinely motivating, and that motivation matters, because a plan abandoned in month four saves nothing. Some people order debts by rate to save the most interest; others clear the smallest balance first for an early win. Both work; the version you actually stick with is the one that pays off.
Revisit the plan whenever your income or expenses change. A raise, a cheaper bill or a little side income can each be pointed straight at the balance, and a single extra lump sum early in the schedule does more than the same amount later. Freeze new borrowing while you work the plan, keep the total payment fixed even as debts clear, and let the freed-up minimums compound your progress. If several high-rate balances are dragging things down, it can be worth checking whether a single loan lowers the blended rate with our debt consolidation calculator. The maths is simple; staying with it is the real work.
Frequently asked questions
How does this debt payoff calculator work?
Enter each debt's balance, minimum monthly payment and interest rate. The calculator charges monthly interest on every balance, pays each minimum, then puts any spare money and your extra payment against the highest-rate debt first. As debts clear it rolls their payments onto the next, and reports the months to debt-free, total interest and a payoff schedule.
What is the debt avalanche method?
The avalanche method directs every spare dollar to the debt with the highest interest rate while paying minimums on the rest. Because the most expensive debt shrinks first, it clears your debt for the least total interest and, usually, in the least time.
Avalanche or snowball — which should I use?
Both are built in here — switch with one tap. Avalanche (highest rate first) saves the most interest; snowball (smallest balance first) clears individual debts sooner for a motivation boost but usually costs a little more. The gap is often small, so the best method is the one you will actually stick with.
What does keeping the total payment fixed mean?
With a fixed total you keep paying the same combined amount every month; when one debt is cleared, its freed-up payment rolls onto the next debt, so payoff speeds up. If you let it decrease instead, the freed-up minimum is not reused and your total monthly outlay drops as debts clear.
How do extra payments help?
Any extra you add goes straight to principal on the highest-rate debt, which stops future interest on that amount. Even a small monthly top-up, a yearly lump sum or a one-time payment can cut months off the plan and save interest. Try different amounts to see the effect.
Can I mix credit cards, loans and a mortgage?
Yes. Add any number of debts of any type — credit cards, car loans, student loans, personal loans or a mortgage. The calculator ranks them by interest rate and builds one combined payoff plan.
Which debt gets the extra money first?
It depends on the method you pick. In avalanche mode the extra goes to your highest interest rate first, for the least total interest; in snowball mode it goes to your smallest balance first, for quicker wins. Either way, each cleared debt's freed-up payment then rolls onto the next.
What is the debt snowball method?
The snowball method pays the minimum on every debt and throws all spare money at the smallest balance first. Clearing a whole debt quickly gives a motivating win, and its payment then rolls onto the next-smallest. It usually costs slightly more interest than avalanche, but many people find it easier to stick with. Choose it with the Snowball button.
How long will it take to pay off my credit cards?
Enter each card's balance, minimum payment and interest rate, add any extra you can pay, and the calculator shows the exact number of months to clear them all, plus the total interest. Adding even a small monthly extra usually cuts the time noticeably.
Does it show an amortization or payoff schedule?
Yes. After you calculate, open the payoff schedule to watch your combined balance fall month by month, with the interest and principal for each period in an annual or monthly view, down to the final zero-balance payment.
Can I use it for a car loan, personal loan or line of credit?
Yes. Any debt with a balance, a monthly payment and an interest rate works — a credit card, car loan, student loan, personal loan, line of credit or mortgage. Add them all and the calculator builds one combined payoff plan from your current balances.
Why does paying only the minimum on a credit card cost so much?
Minimum payments are set very low, so most of each one goes to interest and the balance barely moves, which means clearing a card this way can take years and cost more than the original debt. Adding even a small fixed extra payment, which this calculator lets you test, sharply cuts both the time and the total interest.
Do minimum payments hurt your credit score?
Paying at least the minimum on time actually protects your score — on-time payments are the biggest single factor in your credit history. The catch is indirect: paying only the minimum leaves a high balance, which raises your credit utilization (how much of your available limit you are using). Utilization is about 30% of your score, and experts suggest keeping it under 30%, ideally below 10%. So the minimum keeps you current, but the leftover balance can still drag your score down — paying more than the minimum (which this calculator helps you plan) lowers utilization and clears the debt far faster.
Are these results financial advice?
No. They are planning estimates based on the figures you enter and steady interest rates. Real statements vary with rate changes, fees and payment timing. Use them to compare options, and check with a qualified adviser for decisions.