How credit card interest works
A credit card APR is a yearly rate, but interest is charged every month on the balance you carry. To get the monthly rate, divide the APR by 12. At 24% APR that is 2% a month, so a $4,000 balance costs about $80 in interest in the first month. Whatever part of your payment is left after the interest reduces the balance, and next month's interest is a little lower.
Here B is the balance, r the monthly rate (APR ÷ 12) and n the number of months. If you keep adding new charges, the calculator adds them to the payment you need. Card issuers actually use a daily rate on your average daily balance, so your statement can be off by a few dollars from these numbers, but the payoff time and total interest come out very close.
Why minimum payments take so long
The minimum payment is designed to keep your account in good standing, not to clear the debt. Many cards ask for 1% of the balance plus the month's interest, with a floor of around $25 to $35. As the balance falls, the minimum falls with it, so you pay off only a small slice of the debt each month. Here is a $4,000 balance at 24% APR:
| Monthly payment | Time to pay off | Total interest |
|---|---|---|
| Minimum only (1% + interest, at least $25) | 17 yr 5 mo | $6,763 |
| $150 fixed | 3 yr 3 mo | $1,773 |
| $200 fixed | 2 yr 2 mo | $1,160 |
| $300 fixed | 1 yr 4 mo | $699 |
| $400 fixed | 1 yr | $508 |
The fix is simple: choose a fixed amount and keep paying it, even when the statement asks for less. Every dollar above the interest goes straight to the balance.
Ways to pay off a card faster
- Stop adding new charges. New purchases push the debt-free date back. Enter them under new charges to see by how much.
- Pay a fixed amount, or more. Even a small raise in the monthly payment cuts months off the plan, because more of each payment reaches the balance.
- Ask for a lower APR. Some issuers lower the rate for customers with a good payment history. A lower rate means more of every payment goes to the balance.
- Consider a balance transfer with care. A balance transfer moves the debt to a card with a low or 0% intro APR for a set number of months. There is usually a transfer fee of a percentage of the amount moved, and the regular APR applies to whatever is left when the intro period ends. It helps most when you can clear the balance within the intro period. To model it, add the fee to the balance, enter the intro APR and use the target date mode with the length of the intro period.
If you carry balances on several cards or loans, the debt snowball planner shows which one to pay off first.
How to use the credit card payoff calculator
- 1Choose fixed payment to see how long your payment takes, or target date to see the monthly payment you need to be debt free in a set number of months.
- 2Enter the balance and APR from your statement, plus your monthly payment or the months you want. Optionally add new charges and your card's minimum payment rule.
- 3Read the months to pay off, the debt-free date and the total interest, compare with paying only the minimum, and open the month-by-month table. Copy the result or share a link.
Frequently asked questions
How long will it take to pay off my credit card?
It depends on three numbers: the balance, the APR and what you pay each month. Enter them above and the calculator works through it month by month. As a rough guide, the bigger your payment is compared with the monthly interest, the faster the balance falls. A payment that only just covers the interest can take decades.
How is credit card interest calculated?
Card issuers turn the APR into a daily rate (APR ÷ 365, some use 360) and charge it on your average daily balance over the billing cycle. This calculator uses the common simplification of APR ÷ 12 on the balance once a month, so your statements can differ by a few dollars, but the months to pay off and the total interest come out very close.
How is the minimum payment worked out?
Each issuer sets its own rule, and you find it in your card agreement. A common one is a percentage of the balance, often 1%, plus the interest for the month, with a fixed floor such as $25 or $35 when that comes out lower. Open "New charges and minimum payment" to match your card.
Why does paying only the minimum take so long?
Because the minimum shrinks as the balance shrinks. With 1% plus interest, only about 1% of the balance is paid off each month, so the payment keeps getting smaller and the debt fades away slowly instead of ending. A fixed payment that you keep at the same amount pays the card off in a fraction of the time.
Is this an exact payoff plan?
No. It is an estimate based on what you enter, and it assumes the APR stays the same and you make every payment on time. Late fees, penalty rates, annual fees and changes to a variable APR change the result. Use it to plan and compare, not as financial advice.