Credit card calculator
- Typical credit card interest is charged daily on the average daily balance — this calculator supports daily compounding to reflect that.
- Formulas are based on standard amortization and iterative balance updates (add interest → subtract payment). Learn more on Wikipedia.
Credit Card Calculator — Payoff, Interest & Balance Estimator
Use our advanced Credit Card Calculator to understand how long it will take to pay off your debt, how much interest you’ll pay, and how much faster you can become debt-free by making extra payments. This professional tool supports daily and monthly compounding, various minimum payment rules (percentage, fixed, greater of both, or interest-only), and optional fees such as annual and late fees.
How the Credit Card Calculator Works
Credit card interest is usually compounded daily on your outstanding balance. The calculator uses the iterative formula:
Balancenext = (Balancecurrent × (1 + APR / compounding_periods)) − Payment
Where APR is the annual percentage rate. For daily compounding, the periodic rate is APR / 365. Payments are applied monthly, with interest added before subtracting the payment.
Formulas Used
- Compound interest: A = P × (1 + r/n)n×t
- Monthly interest rate: r = APR / 12
- Minimum payment (if percent rule): Payment = Balance × (min% / 100)
- Amortization step: New balance = (Old balance + Interest + Fees) − Payment
How to Use Credit card calculator
- Enter your current credit card balance and APR.
- Choose whether interest compounds daily or monthly.
- Select a minimum payment rule or enter your own monthly payment.
- Optionally, add extra payments, one-time fees, or an annual fee.
- Click Calculate to see time to payoff, total interest, and payoff date.
Example
Suppose you owe $5,000 at 19.99% APR, with daily compounding and $150 monthly payment. It will take about 44 months to pay off the balance, and you’ll pay about $1,740 in interest. Increasing payments by just $25/month reduces payoff time by nearly 7 months!
Sources & References
FAQ — Credit card calculator
1. How does this calculator compute payoff time?
It iteratively applies interest to your balance, subtracts payments, and counts how many months are needed to reach zero balance.
2. What’s the difference between daily and monthly compounding?
Daily compounding charges interest each day, resulting in slightly higher total costs than monthly compounding at the same APR.
3. How are minimum payments calculated?
Based on your selected rule — either a fixed amount, a percentage of the balance, or the greater of both (common in most credit cards).
4. What if I make extra payments?
Extra payments directly reduce your balance, shortening payoff time and lowering total interest significantly.
5. Does this calculator include annual or late fees?
Yes, you can specify one-time or recurring fees, which are added to the balance before payment application.
