Credit Card Calculator
Enter your credit card balance, annual interest rate, and either your monthly payment or the time you want to be debt-free. The calculator instantly shows total interest charged, total paid, and a month-by-month payoff schedule. Switch modes to solve for the payment or the payoff date.
How the credit card payoff calculation works
Credit card interest compounds monthly. Each month your issuer multiplies your statement balance by the monthly periodic rate (APR divided by 12) to get the finance charge. Your payment first covers that charge, and only the remainder chips away at the principal. That is why paying the minimum keeps you in debt for years: on a $3,500 balance at 22% APR, a minimum payment of around $70 barely exceeds the monthly interest of about $64, leaving just $6 of principal repaid per month. The payoff formula works in reverse: given a balance B, monthly rate r, and monthly payment P, the number of months T is T = -log(1 - r x B / P) / log(1 + r). Flip that around and you get the required payment: P = r x B / (1 - (1 + r)^(-T)). This calculator uses both formulas depending on which mode you choose.
Two modes: payment to time, or time to payment
Mode 1 - Fixed payment: Enter your current balance, APR, and the monthly payment you can afford. The calculator tells you how many months until the balance hits zero, how much interest accumulates over that period, and what fraction of every dollar you send in goes to the bank rather than to reducing your debt. Mode 2 - Fixed timeframe: Enter the balance, APR, and the date you want to be debt-free. The calculator tells you exactly what you need to pay each month to hit that target. This is useful for setting a budget when you have a concrete goal, such as clearing a card before a planned purchase or before an introductory 0% period expires on another card.
Strategies to pay off faster
Even small increases in your monthly payment have an outsized effect because they compound over time. On a $3,500 balance at 22% APR, raising your payment from $100 to $150 cuts the payoff period from about 51 months to 29 months and saves around $600 in interest. The avalanche method directs any extra money to the card with the highest APR first, which minimizes total interest mathematically. The snowball method pays off the smallest balance first regardless of rate, which can build psychological momentum. A balance transfer to a 0% promotional card pauses interest entirely, but you must pay a transfer fee (typically 3%-5%) and clear the balance before the promotional rate expires, or the deferred interest resets at a high rate.
Understanding your credit card statement
Your APR is the annual rate before compounding. Most issuers compound daily using the average daily balance (ADB) method: they sum your balance for each day of the billing cycle, divide by the number of days, multiply by the daily periodic rate (APR / 365), and then multiply by the number of days. The result is very close to what the monthly-compounding formula produces for normal balances, so this calculator uses the simpler monthly rate for planning purposes. Grace periods apply to purchases only. If you pay your statement balance in full each month, you owe no interest on purchases at all. Cash advances and balance transfers typically have no grace period and start accruing interest immediately at a higher rate.
Typical credit card APR ranges (USA, 2026)
| Card type | Typical APR range | Notes |
|---|---|---|
| 0% introductory offer | 0% | Usually 12-21 months; reverts to standard APR after |
| Low-rate card | 12% - 16% | Good credit required |
| Average bank card | 17% - 22% | Most general-purpose cards |
| Rewards / travel card | 20% - 28% | Higher APR offsets rewards value |
| Store / retail card | 25% - 30% | Easiest to qualify for, highest rates |
| Cash advance | 25% - 36% | Starts accruing immediately, no grace period |
| Secured card | 22% - 29% | For building or rebuilding credit |
Rates vary widely by card type, issuer, and creditworthiness.
Frequently asked questions
How long will it take to pay off my credit card if I only pay the minimum?
It depends on how the minimum is calculated. Most issuers set the minimum at either a flat amount (often $25-$35) or about 1%-2% of the balance plus interest, whichever is higher. At 22% APR on a $3,500 balance with a 2% minimum, it takes over 17 years and you pay more than $3,500 in interest alone. Enter your actual minimum payment in the calculator to see your specific payoff date.
What is APR and how is monthly interest calculated from it?
APR stands for Annual Percentage Rate. It is the yearly cost of borrowing before compounding. To find the monthly charge, divide APR by 12. At 21.99% APR the monthly rate is about 1.833%. Multiply that by your statement balance and you get the month's interest charge. For example, $3,500 x 1.833% = $64.15 in interest for that month.
Does making extra payments really save that much?
Yes, and the savings grow the earlier you make them. Because your balance is largest at the start, each extra dollar you pay now eliminates the most future interest. On a $5,000 balance at 24% APR with a $150 monthly payment, adding $50 extra per month saves over $900 in interest and cuts more than 14 months off the payoff period.
Should I do a balance transfer to a 0% card?
A 0% balance transfer can be very effective if you can pay off the transferred amount before the promotional period ends, which is usually 12-21 months. Factor in the transfer fee (typically 3%-5% of the balance). If the fee is $175 on a $3,500 transfer and you were going to pay $600 in interest, the transfer saves $425. If you cannot clear the balance before the promotion expires, the rate resets to the card's standard APR, which may be as high as the card you transferred from.
How does the avalanche method differ from the snowball method?
Both methods apply extra money to one card at a time while paying minimums on the rest. The avalanche method targets the card with the highest APR first, which cuts the most interest mathematically. The snowball method targets the smallest balance first regardless of rate, giving you quick wins that can sustain motivation. Mathematically the avalanche saves more money; psychologically the snowball works better for some people. Either method beats making only minimum payments on all cards.
What happens to my calculation if my payment is less than the monthly interest?
If your payment does not exceed the monthly interest charge, the balance actually grows every month rather than shrinking - a situation called negative amortization. The calculator flags this and shows "Payment too low to cover interest." You must pay at least the monthly interest charge to stop the debt from growing, and more than that to eventually eliminate it.