Result
Result reflects the current submitted inputs.
- Risk B
- Reviewed 2026-05-26
- 2 sources
Breakdown
- APR day-count basis
- 365 days
- Billing cycle length
- 30 days
- This calculator uses a simplified average-daily-balance estimate; it does not reconstruct each daily transaction.
- The daily periodic rate is purchase APR divided by either 365 or 360, as selected by the user.
- Promotional APRs, cash advance APRs, penalty APRs, grace-period eligibility, minimum-interest charges, late fees, and issuer-specific allocation rules are excluded unless entered as new charges or fees.
- If average daily balance is 0, estimated interest is 0 even when a current balance is entered.
- This is an educational estimate, not financial advice, legal advice, or a credit card issuer disclosure.
Accuracy notes
- Risk level
- B
- Reviewed
- 2026-05-26
- Sources
- 2
- Primary result
- Estimated interest this cycle
Formula logic is kept in a pure calculator module with fixtures, source notes, and page-visible assumptions.
What the result means
The payoff time and total interest show the real cost of carrying a balance. Small increases in the monthly payment have an outsized effect because more of each payment goes to principal instead of interest. If the payment barely exceeds the monthly interest, the balance hardly moves, which is how minimum-only payments keep debt alive for years.
Use the result this way
- Start with Estimated interest this cycle, then use supporting outputs for context.
- Verify Current balance, Purchase APR, and Average daily balance before copying the result.
- Check the formula, example, and assumptions before reusing the answer.
User job
How to use this calculator
Use Credit Card Calculator when you need estimated interest this cycle, then use estimated next balance and payment after interest to check the context for planning conversations, quote comparisons, payment checks, and scenario review.
Best for
- Comparing one financial scenario with another
- Preparing questions for a lender, advisor, or statement review
- Reviewing a default example before entering your own current balance and purchase apr.
Check before relying
- Verify rates, fees, timing, taxes, and local rules against official documents before acting.
- This calculator uses a simplified average-daily-balance estimate; it does not reconstruct each daily transaction.
- The daily periodic rate is purchase APR divided by either 365 or 360, as selected by the user.
- Source context: Consumer Financial Protection Bureau, reviewed 2026-06-16.
Next useful step
- Credit Card Payoff CalculatorUse next when your task shifts from Credit Card Calculator to Credit Card Payoff Calculator.
- Debt Consolidation CalculatorUse next when your task shifts from Credit Card Calculator to Debt Consolidation Calculator.
- Loan CalculatorUse next when your task shifts from Credit Card Calculator to Loan Calculator.
Formula
Each month, interest is added to the balance at the monthly rate (APR / 12), then your payment is subtracted. Monthly interest = balance x (APR / 12 / 100). The remaining balance carries to the next month. Because interest compounds on the leftover balance, paying only the minimum stretches the payoff out for years and multiplies the interest.
- Monthly interest = balance x (APR / 12). At 20% APR, a $5,000 balance accrues about $83 in interest the first month.
- Paying only the minimum (often 1-3% of the balance) can take many years and cost more in interest than the original purchase.
- Every dollar above the interest charge goes to principal, so raising the payment shortens the payoff dramatically.
- Avoiding new charges while paying down a balance is essential; new purchases reset progress and add more interest.
- A lower APR (through a balance transfer or negotiation) means more of each payment reduces principal.
Inputs
Enter your current balance, the card's annual interest rate (APR), and the fixed monthly payment you plan to make. The calculator works month by month, adding interest and subtracting your payment, until the balance reaches zero, then reports the number of months and the total interest paid.
Example
On a $5,000 balance at 20% APR, paying $150 a month takes about 47 months and costs roughly $1,950 in interest. Raising the payment to $250 a month clears it in about 24 months and cuts the interest to around $900 - paying more each month saves both time and money.
FAQ
How long will it take to pay off my credit card?
It depends on the balance, APR, and monthly payment. A $5,000 balance at 20% APR takes about 47 months at $150 a month, but only about 24 months at $250 a month. Paying more shortens it sharply.
How is credit card interest calculated?
Interest is charged monthly at the APR divided by 12. A $5,000 balance at 20% APR accrues about $83 in interest the first month, added to the balance before your payment is applied.
Why does paying the minimum take so long?
The minimum payment is often only slightly more than the monthly interest, so very little goes to principal. The balance barely shrinks, stretching payoff over many years and multiplying the interest paid.
How much should I pay each month?
Pay as much above the minimum as you can. Even an extra $50 or $100 a month can cut years off the payoff and save hundreds or thousands in interest, since the extra goes straight to principal.
Does a balance transfer help?
A balance transfer to a lower or 0% introductory APR means more of each payment reduces principal, so the debt clears faster. Watch for transfer fees and the rate after the intro period ends.
What should I verify before using credit card calculator?
Verify current balance, purchase apr, and average daily balance, the displayed formula, and the worked example before copying the result into another document or decision.
Sources
Last reviewed: 2026-05-26
- officialReviewed 2026-06-16Credit CardsConsumer Financial Protection Bureau. How credit card interest and minimum payments work and strategies to pay down balances.
- officialReviewed 2026-06-16Using Credit CardsFederal Trade Commission. Consumer guidance on credit card terms, interest, and payments.
Disclaimer
Results are estimates assuming a fixed payment, a constant APR, and no new charges or fees. Real cards may have variable rates, fees, and changing minimum payments. This is not financial advice.