Credit Card Payoff Calculator: Payment, Time and Interest

How the payoff calculation works

Each month, interest is estimated as the opening balance multiplied by APR ÷ 12. The payment is applied after that interest. The process repeats until the balance reaches zero, with the final payment reduced when necessary.

For a target number of months, the required fixed payment uses the standard amortization formula: payment = balance × r × (1 + r)ⁿ ÷ ((1 + r)ⁿ − 1), where r is the monthly rate and n is the number of payments.

Checked example

With a $5,000 balance, 22% APR, a $200 regular payment and $50 additional payment, the calculator applies $250 each month and reduces the final payment automatically. Compare the result with the $200 baseline to see the estimated interest and time saved.

Why a payment may not reduce the balance

If the payment is less than or equal to the first month’s interest, the debt does not amortize under these fixed assumptions. The calculator rejects that scenario instead of showing a misleading payoff date.

Important limits

• Credit-card interest may use a daily periodic rate and average daily balance rather than APR ÷ 12.
• Variable APR changes, promotional rates, fees, penalty rates and new transactions are excluded.
• Issuer minimum-payment formulas may change as the balance falls; this tool uses the payment entered.
• Results are estimates, not lending, credit or financial advice.

Related calculators

Use the Compound Interest Calculator for investment growth, the ROI Calculator for returns, or the Salary Calculator for gross-pay equivalents.