The minimum payment is designed to keep the balance alive: interest each month is charged first, and anything above it is what actually reduces what you owe. A payment that barely covers the interest pays the debt for years without shrinking it.
How credit card interest actually works
The APR is divided by 12 and applied to the balance every month. If your payment does not exceed that first month's interest, the balance grows and the debt never ends — the calculator says so plainly rather than showing an impossible date.
Everything above the interest goes to principal. That is why the relationship between payment and payoff time is steep: the first dollars of a payment buy interest, the rest buy freedom, and shifting the split by even $50 a month moves the payoff date by months.
The formula
Each month: interest = balance × APR ÷ 12; new balance = balance + interest − payment. The calculator repeats this until the balance reaches zero and reports the months it took. It is the same arithmetic your statement performs, so the payoff date it shows is the one your card would really reach.
Two moves that change the answer
The first is the payment itself — try the number plus 10% and watch the years fall. The second is the rate: a balance-transfer card at 0% for 18 months or a fixed personal loan in the low teens converts compound credit-card interest into a schedule that actually ends. Compare the total interest of each route here before paying any transfer fee.
If several cards carry balances, the order of attack matters less than the consistency of it. Paying the highest-rate card first minimizes interest mathematically; paying the smallest first clears a creditor and keeps the plan alive. Either works only if the total payment never falls when one balance reaches zero — the freed payment rolls onto the next card, not into spending.
Frequently asked questions
What if the calculator says "never"?
Your payment does not cover the monthly interest, so the balance grows instead of shrinking. Raise the payment above the first month's interest shown below the result — there is no schedule at all below that level.
Does this include minimum-payment schedules?
Enter your card's minimum payment and you will see why lenders like it: the payoff takes many years and the interest often exceeds the original balance. The minimum is usually 1–3% of the balance, recalculated as the balance falls — this calculator holds the payment fixed, which is the more conservative view.
Is a balance transfer worth it?
If you can clear the balance inside the promotional window, yes: the fee (usually 3–5%) is far smaller than a year of 20%+ interest. If you cannot, the deferred interest returns at the card's full rate and the transfer can end up costing more than staying put.