Credit Card Payoff Calculator

Credit cards are revolving debt: there is no fixed term, only a balance, an interest rate and whatever you choose to pay each month. That freedom is exactly what makes them expensive — pay a little and the balance lingers for years, with interest compounding on top. This calculator turns that open-ended situation into two concrete answers.

Tell it a fixed monthly payment and it works out how long the card takes to clear and the total interest you’ll pay. Or tell it a deadline and it works out the payment you’d need to hit it. Both run the same reducing-balance maths a bank uses; the only difference is which unknown you’re solving for.

Each month the card charges interest on the outstanding balance at the monthly periodic rate, which is the APR divided by twelve:

r = APR ÷ 12 ÷ 100  •  interest = balance × r

Your payment first covers that interest; whatever is left reduces the principal. The next month’s interest is then charged on the smaller balance, so the principal portion of each payment grows while the interest portion shrinks — classic amortisation. To clear a balance B in n months, the required fixed payment is:

PMT = B · r ÷ (1 − (1 + r)⁻ⁿ)

Solving the same balance-reaches-zero equation for the exponent gives the inverse — the months for a fixed payment: n = −ln(1 − B·r ÷ PMT) ÷ ln(1 + r). At 0% APR both collapse to simple division (PMT = B ÷ n; n = B ÷ PMT rounded up) with no interest at all.

The schedule below is produced by the same engine that powers the calculator above. Watch the interest column fall and the principal column rise each month as the balance comes down — and note the reduced final payment that clears the last few dollars.

Paying $200 a month clears this card in 34 months, and the total interest comes to about $1,749.88 — so the $5,000 balance ends up costing roughly $6,749.88. The final payment is trimmed to $149.88 so the balance lands exactly on zero rather than overshooting.

Because interest is charged on the balance you still owe, a bigger payment doesn’t just finish sooner — it slashes the total interest. Here is the same $5,000 at 22% APR across a range of monthly payments:

Notice the top row: a $90 payment is below one month’s interest (about $91.67 on this balance), so it never clears the card at all — every dollar is eaten by interest and the balance never falls. That’s the minimum-payment trap. Above that line, the effect of paying more is dramatic — doubling the payment from $100 to $200 roughly quarters the total interest and cuts the payoff from over eleven years to under three. The first dollars above the interest line do the most work.

Once you know how long your current payment takes, the natural next question is what you can do to shorten it. Three options are worth running through the calculator:

• Pay more each month. This is the highest-impact lever because every extra dollar goes directly to principal and cuts the interest on every future month. The payment-comparison table above shows how dramatically even a modest increase shortens the payoff — doubling the payment from $100 to $200 on a $5,000 balance at 22% APR reduces the total interest by about 80%.
• Transfer to a 0% promotional card. A balance-transfer card with a 0% intro APR stops interest accruing for the promotional period (typically 12–21 months). Enter 0% in this calculator to see how fast you could clear the debt when none of your payment goes to interest. Factor in the typical 3–5% balance-transfer fee: add it to the balance so the calculator gives you a realistic target payment. The discipline required is clearing the full balance before the promotional rate ends — any remaining balance will revert to the card's standard APR.
• Consolidate with a lower-rate personal loan. If your credit score qualifies you for a personal loan at a lower rate than your card's APR, replacing the revolving credit-card balance with an instalment loan locks in a lower rate and a fixed payoff date. Use the payment-needed mode here with the loan's APR and term to compare the monthly payment against what you're paying on the card now.

If you carry balances across several cards, the debt-avalanche method (clear the highest-APR card first to minimise total interest) and the debt-snowball method (clear the smallest balance first for motivational wins) are complementary approaches — run each card through this calculator separately to build a plan.

The calculator answers the same underlying question from two directions. Pick the mode that matches what you already know — your affordable payment, or your deadline.

This is a clean payoff estimate, not a card statement. It assumes a fixed APR for the whole payoff, no new purchases, cash advances or balance transfers, and no fees or penalty rates. It also uses a monthly periodic rate rather than the daily average-daily-balance method most issuers actually use, so an actual statement can differ by a few units. And it models a fixed payment — not the shrinking percentage-of-balance minimum, which drags a payoff out far longer. Treat the result as an illustration to plan around, not a guarantee, and not financial advice.