Credit Card Payoff Calculator

Background.

A credit card payoff calculator turns the question every cardholder is afraid to ask — how long will it actually take to clear this balance, and what will it cost me in interest — into two numbers you can plan around. Enter your current balance, the purchase APR from your card agreement, and either the fixed monthly payment you intend to send or the target date you want the balance gone by, and the calculator runs the closed-form credit-card amortisation formula plus a month-by-month simulation to give you the exact payoff month, total interest charged, and total amount paid.

The reason a calculator like this exists is the minimum payment trap. Credit card minimum payments are typically set at 1% to 3% of the outstanding balance plus the current month's interest charge, which means the minimum scales with the debt and shrinks as you pay it down. On a $5,000 balance at 22% APR, the typical minimum payment of around $100 a month would take more than 25 years to clear and cost over $7,000 in interest — more than the original balance — because almost the entire payment is consumed by the monthly finance charge. Congress recognised this problem when it passed the Credit CARD Act of 2009, which now requires every monthly statement to disclose how long the balance will take to clear at the minimum payment, how much will be paid in total, and what a three-year payoff payment would look like instead. This calculator gives you the same disclosure for any payment, any balance, any APR.

The math is identical: monthly interest equals the balance times the APR divided by twelve, the payment first covers that interest and then reduces principal, and the process repeats every month until the balance hits zero. The compounding effect is what makes credit cards uniquely expensive. Unlike an installment loan, where the payment is fixed and the term is fixed and you know on day one exactly when the debt will end, a credit card lets you carry a balance indefinitely and prices that flexibility at roughly twice the rate of a personal loan.

The Federal Reserve's G.19 Consumer Credit release tracks average commercial-bank credit-card rates in the 22% to 23% range for assessed accounts in early 2026, versus 12% to 13% for two-year personal loans at the same banks. That spread is not a number — it is the entire reason a payoff calculator matters.

Three numbers control your total interest bill. The APR (which you can sometimes lower by calling the issuer or moving to a balance transfer card with a 0% introductory window), the payment (which you control directly), and the time horizon (which is just the consequence of the first two). Raising the monthly payment is by far the most powerful lever, because anything paid above the interest charge reduces the balance and shrinks every subsequent finance charge. On the same $5,000 at 22%, doubling the payment from $100 to $200 cuts the payoff from 25+ years to about 32 months and the interest bill from over $7,000 to under $1,500. The calculator below makes that arithmetic explicit so you can see exactly what each dollar of extra payment buys you in time and money.

What is credit card payoff calculator?

A credit card is a revolving line of credit — the lender sets a credit limit, you draw against it as you spend, and you pay back any combination of principal and interest as long as you meet the contractual minimum each month. Unlike an installment loan, there is no fixed term and no fixed payment, which is why the math has to be computed and not just looked up. When a balance is carried past the statement due date, interest accrues against the average daily balance at a periodic rate equal to the APR divided by 365 (or 360, depending on the issuer's disclosed day-count convention) and is then assessed in one monthly finance charge on the next statement. For payoff planning the daily-versus-monthly distinction is almost always immaterial — the effective monthly rate is APR ÷ 12 to within a fraction of a percent — so this calculator uses the standard monthly-compounding model that matches your statement's amortisation almost exactly. The closed-form payoff formula assumes a fixed monthly payment large enough to exceed the first month's interest charge. The solver then either inverts the formula to find the months n given a payment M (the n = -ln(1 - Pr/M) / ln(1 + r) form), or solves it for the payment M given a target n (the standard amortising-loan payment formula). After computing n, the calculator runs a month-by-month simulation so that the last month's partial payment is captured exactly and the totalInterest figure is accurate to the cent — the same arithmetic your card issuer uses when they print the CARD Act minimum-payment disclosure box on your statement. This calculator models a fixed monthly payment against a static starting balance with no new charges added. Use it for payoff planning on a card you have stopped using, for evaluating a balance-transfer scenario, or for sizing the extra payment needed to clear a card by a specific date. It does not model variable minimum payments, new purchases, cash advances at a separate APR, or promotional 0% periods that revert mid-payoff — those scenarios require a more complex simulator.

How to use this calculator.

1. 01Look up your current credit card statement balance — not the available credit and not the minimum due. The statement balance is the figure interest is being charged against, and it is the right number to enter.
2. 02Find the purchase APR on the same statement, usually printed under an 'Interest charge calculation' heading. If your card has separate APRs for purchases, balance transfers, and cash advances, use the APR that matches the bulk of your balance.
3. 03Choose what to solve for. Pick 'Months to pay off' if you have a fixed monthly amount you can commit and want to see how long the card will take. Pick 'Required monthly payment' if you have a target date — twelve months, two years, three years — and want the dollar amount needed to hit it.
4. 04Enter your monthly payment or target months as appropriate. If you are using the months mode, the payment must exceed the first month's interest charge (balance × APR ÷ 12), otherwise the calculator will flag the payment as too low and refuse to solve, because the balance will never decrease.
5. 05Read the four outputs. Months to payoff is the headline. Total interest is what carrying the balance costs you. Total paid is the cash sum of every payment you will send the issuer. Monthly payment echoes or solves for the fixed installment.
6. 06Compare scenarios. Raise the monthly payment by $25 or $50 and watch the payoff months and total interest collapse. Drop the APR by 5 or 10 percentage points (the impact of a balance transfer to a 0% card) and see how much faster the same payment retires the balance. The point of the calculator is to make the trade-offs visible before you commit to a strategy.

The formula.

Credit card payoff math has a clean closed-form solution. Let P be the balance, r the periodic monthly rate (APR ÷ 100 ÷ 12), and M the fixed monthly payment. The number of months n required to clear the balance is n = -ln(1 - (P × r) / M) / ln(1 + r), rounded up to the next whole month because the last payment is usually partial. This is the same formula used to derive the term of an amortising loan, solved for n instead of M. The expression is only finite when M > P × r — that is, when the monthly payment strictly exceeds the first month's interest charge. If M ≤ P × r the entire payment is consumed by interest, the balance never falls, and the log argument 1 - (P × r) / M becomes zero or negative; mathematically the payoff is infinite and the calculator throws a 'payment too low' error to flag the problem. In the inverse direction — solving for the payment that clears the balance in exactly n months — the standard amortisation formula gives M = P × r × (1 + r)^n / ((1 + r)^n - 1), which is the same equation rearranged. For the zero-interest case (APR = 0, common during a balance transfer promotional period) both formulas collapse to n = ceil(P / M) and M = P / n respectively. After computing n the calculator simulates the loan month by month using decimal-precision arithmetic, applying the contractual payment until the balance plus interest is small enough that a partial payment retires it. That simulation produces the exact totalInterest figure quoted on the output, which matches your statement's running total to the cent.

A worked example.

Frequently asked questions.

References& sources.

1. [1]Consumer Financial Protection Bureau — How long will it take to pay off my credit card? (Ask CFPB)
2. [2]Federal Reserve — G.19 Consumer Credit release (monthly series including commercial bank credit card APRs)
3. [3]Truth in Lending Act — Regulation Z, 12 CFR §1026.7 (periodic statement disclosures, including credit card APR and finance charge requirements)
4. [4]Credit Card Accountability Responsibility and Disclosure Act of 2009 (Public Law 111-24) — establishes the minimum-payment disclosure box, repricing rules, and statement standards
5. [5]Bodie, Z., Kane, A., & Marcus, A. J. (2024). Investments (12th ed.), Chapter 5 — Time value of money and the derivation of the closed-form amortisation/payoff formula used by this calculator.
6. [6]Agarwal, S., Chomsisengphet, S., Mahoney, N., & Stroebel, J. (2015). Regulating Consumer Financial Products: Evidence from Credit Cards. Quarterly Journal of Economics, 130(1), 111-164 — peer-reviewed analysis of the CARD Act's effect on credit card pricing and consumer payment behaviour.