Debt Payoff Calculator
Enter what you owe and what you can pay, and see how long the debt takes to clear, what it costs in interest, and what happens if you pay more.
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Why minimum payments keep you in debt
A minimum payment is designed to keep an account current, not to clear it. On a revolving account the minimum is usually a small percentage of the balance plus that month's interest, which means the payment shrinks as the balance falls. The result is that the debt approaches zero ever more slowly, and the total interest can end up exceeding the original balance by a wide margin.
The numbers are stark. A 6,000 dollar balance at 24.99 percent with a minimum payment that starts at 125.02 dollars takes 65 years to clear and costs 91,517 dollars in interest. You would repay more than fifteen times what you borrowed. The same balance cleared with a fixed 300 dollar monthly payment is gone in 27 months and costs 1,841 dollars in interest. Nothing about the debt changed; only the payment did.
This is why a fixed payment, rather than a percentage-based minimum, is the single most important change you can make. A fixed payment does not shrink as the balance falls, so the debt is attacked at a constant rate and the compounding works in your favour instead of against you. If you do nothing else after reading this, convert your minimum payment into a fixed amount.
When you have several debts, the order in which you clear them matters less than most people expect, but it does matter. The avalanche method targets the highest interest rate first and mathematically minimises total interest. The snowball method targets the smallest balance first, which clears accounts sooner and produces visible progress. Research on behaviour consistently finds that people who use the snowball method are more likely to stick with a payoff plan, and a plan you finish beats an optimal plan you abandon. The difference in total interest between the two is usually modest once the payment amount is fixed.
How the payoff time is calculated
Each month, interest is charged on the balance and the rest of your payment reduces it. The schedule repeats until the balance reaches zero.
| Symbol | Meaning |
|---|---|
Balanceₙ |
What you owe after this month's payment |
i |
Monthly interest rate: the annual rate divided by 12 |
Payment |
The fixed amount you pay each month |
If the payment is less than the monthly interest, the balance grows rather than falls and the debt never clears. The calculator detects that case and says so instead of returning a meaningless number of months.
Worked example: 6,000 dollars at 24.99 percent
A 6,000 dollar balance at 24.99 percent, comparing the minimum payment with a fixed 300 dollar monthly payment.
| Strategy | Monthly payment | Months to clear | Total interest |
|---|---|---|---|
| Minimum payment only | $300 (the minimum shrinks) | 380 | $41,450.69 |
| Fixed payment | $150 | 87 | $7,025.42 |
| Fixed payment | $200 | 48 | $3,511.52 |
| Fixed payment | $300 | 27 | $1,841.44 |
| Fixed payment | $400 | 19 | $1,268.73 |
Paying 150 dollars instead of the shrinking minimum turns a 65-year debt into a 7-year one and saves 84,492 dollars in interest. Doubling to 300 dollars clears it in just over two years. Every additional dollar goes entirely to principal, which is why the effect is so large and so fast.
Estimates only. Your lender's figures may differ because of fees, escrow and rounding.
Clearing debt faster
Convert the minimum into a fixed payment
A percentage-based minimum shrinks every month, which is precisely what keeps the debt alive. Decide on a fixed amount you can sustain and pay that regardless of what the statement asks for. This single change does more than any other.
Pay the highest rate first
Every dollar aimed at a 24.99 percent balance saves 24.99 percent, guaranteed and tax-free. That is a better return than most investments reliably produce. List your debts by rate and attack from the top.
Consider a balance transfer, with your eyes open
A zero percent introductory offer can pause interest for a year or more, which lets every dollar reduce principal. But there is usually a transfer fee of 3 to 5 percent, the rate jumps when the offer ends, and running up the cleared card again leaves you worse off. Use it only with a firm repayment plan.
Protect a small emergency buffer
Paying every spare dollar towards debt and keeping nothing in reserve means the next unexpected expense goes straight back onto a card. A small buffer of perhaps 1,000 dollars prevents the cycle from restarting.
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Frequently asked questions
What is the difference between the snowball and avalanche methods?
Avalanche targets the highest interest rate first, which minimises the total interest you pay. Snowball targets the smallest balance first, which clears individual accounts sooner and provides visible progress. Avalanche is mathematically optimal; snowball is often easier to stick with. Both work far better than paying only the minimum.
Why does paying only the minimum take so long?
Because the minimum is usually a percentage of the balance plus interest, so it falls as the balance falls. With a high interest rate, most of each payment covers interest and very little reduces the principal. On a 24.99 percent balance the monthly interest alone is over 2 percent, so progress is glacial unless the payment is fixed.
How much should I pay each month to clear debt quickly?
As much as you can sustain without borrowing again. The calculator shows the trade-off at each level, and the pattern is consistent: increasing the payment cuts both the time and the total interest sharply, because additional dollars remove future interest as well as current principal.
Should I use savings to clear debt?
Compare the interest rate on the debt with what the savings earn. Clearing a 24.99 percent balance with idle cash earning 4 percent is a guaranteed 21 percent gain. Keep an emergency buffer first, since debt can be re-borrowed but an emergency cannot be postponed.
Does consolidating debt help?
It can, if the new rate is meaningfully lower and you do not run the cleared accounts back up. Consolidation does not reduce the amount owed; it changes the rate and the structure. Without a fixed payment plan and a spending change, consolidated debt frequently returns.