Credit Card Payoff Calculator

What this calculator does

The calculator applies one month of interest at APR divided by 12, subtracts the payment, and repeats until the modeled balance reaches zero. It reports payoff time, total interest, total paid, and the first twelve schedule rows so you can see how each early payment is divided between interest and principal.

When to use it

Use it when you are choosing a payment target, evaluating whether a balance-transfer idea changes the payoff path, or checking whether a payment is large enough to reduce the balance. It is most useful when you model no new purchases, then compare two or three payment amounts rather than relying on a single plan.

Inputs explained

• Card balance: the current revolving balance you want to model, excluding future purchases or fees that have not been added yet.
• APR: the annual percentage rate converted to a monthly rate for this simplified schedule. Actual issuers often calculate interest daily.
• Monthly payment: the fixed payment used every month in the model. The calculation warns when it does not cover modeled monthly interest.

Formula or method

For each month, the model calculates interest as the remaining balance times APR divided by 12. It then applies the smaller of the payment amount or the amount needed to clear the balance. The process repeats without adding new charges. This is a fixed-payment projection, not an issuer statement calculation.

Worked example

With a $5,000 balance, 19.99% APR, and a $200 payment, the first month's modeled interest is about $83.29. About $116.71 of that first payment reduces principal. Under the fixed-payment and no-new-purchases assumption, the balance takes about 32 months to clear and adds roughly $1,358 in interest.

How to interpret the result

The payoff time is a comparison number, not a promise. If the payment is only slightly higher than monthly interest, the balance can decline very slowly. Compare the first schedule rows with a higher-payment scenario to see how much of the payment reaches principal sooner.

Practical checks before using the result

• Create a no-new-purchases version first. Adding everyday spending after modeling a payoff plan can invalidate the schedule immediately.
• Compare a payment increase with a realistic cash-flow source, such as a lower subscription cost or a temporary income change. A plan only helps if the payment can be sustained.
• Read the card agreement and recent statement for the actual APR, payment due date, fees, promotional terms, and interest method before relying on a longer plan.

Common mistakes

• Entering the purchase APR when the balance is subject to a different cash-advance, penalty, or promotional rate.
• Assuming a payment stops interest immediately. Interest in this model continues on the unpaid balance each month.
• Treating a modeled payoff date as reliable while continuing to add charges, missing due dates, or ignoring fees and rate changes.

Limitations and disclaimers

These results are general estimates only and are not financial, tax, or legal advice. Actual card terms can use daily balances, multiple APRs, grace periods, fees, promotional terms, changing minimum payments, and new charges. The schedule assumes one fixed APR, one fixed payment, and no additional purchases.

Related calculator context

The Debt Payoff Calculator compares two balances when you need to decide where an extra payment goes. The Interest Calculator helps explain why an APR compounds over time, while the Paycheck Calculator can help test whether a chosen payment fits a take-home budget.