Credit Card Interest & Payoff Calculators
Twelve free, accurate calculators to help you understand exactly what your credit card costs — and how to pay it off faster. Built and reviewed against CFPB and Federal Reserve interest-rate data.
A credit card interest calculator shows how much of your payment goes to interest versus principal, based on your balance, APR, and payment amount. Most issuers apply a daily periodic rate (your APR ÷ 365) to your average daily balance. Use the Credit Card Interest Calculator below to see your exact numbers.
All 12 Calculators
Credit Card Interest Calculator
Find out exactly how much of your next payment goes to interest versus principal — and what your balance will really cost you over time.
Open calculator →Credit Card Payoff Calculator
Enter your balance, APR, and monthly payment to see your exact payoff date and total interest cost — then test how extra payments shorten it.
Open calculator →Credit Card Minimum Payment Calculator
See how your issuer's minimum payment is calculated — and the true cost of paying only the minimum every month.
Open calculator →Credit Card Balance Transfer Calculator
Compare what you'd pay by staying put versus transferring your balance — fees included — to see your real net savings.
Open calculator →Multi-Card Debt Payoff Calculator (Snowball vs. Avalanche)
Add every card you're carrying a balance on and see, side by side, which order of payoff — smallest balance first or highest APR first — saves you more.
Open calculator →Credit Card APR Calculator
Turn an abstract percentage into real numbers: see what your APR costs you per month and per year on your actual balance.
Open calculator →Daily Periodic Rate Calculator
See the exact daily rate your issuer applies to your balance, and how many dollars that adds up to per day, week, and billing cycle.
Open calculator →Extra Payment Savings Calculator
Add a fixed extra amount to your monthly payment and see exactly how many months and how many dollars in interest it saves you.
Open calculator →0% Intro APR Calculator
Find the monthly payment required to clear your balance before the promotional 0% period ends, and see the cost if you fall short.
Open calculator →Credit Card Payoff Time Calculator
Answer the question "how long will this actually take?" — enter your balance, APR, and payment for an exact month-by-month countdown.
Open calculator →Credit Utilization Calculator
Your utilization ratio is one of the biggest factors in your credit score after payment history. See yours instantly, per card and overall.
Open calculator →Debt Consolidation vs. Balance Transfer Calculator
Two very different ways to tackle the same balance — compare total cost side by side before you decide.
Open calculator →Popular Guides
How Does Credit Card Interest Work? A Plain-English Example
A plain-English walkthrough of how credit card interest actually works, with a real dollar example showing exactly how your balance grows.
How to Avoid Credit Card Interest Completely
Seven practical ways to avoid paying credit card interest, from the grace period rule to 0% APR cards — and how to check if you're already paying more than you need to.
Average Credit Card Interest Rate in 2026
The average credit card APR in 2026, how it has changed, and how to tell whether your own card's rate is above or below average.
Is It Better to Pay Your Credit Card in Full or Make Minimum Payments?
Paying in full versus paying the minimum, compared with real numbers — and why the answer is almost always the same.
Frequently Asked Questions
Is CalcMyCard actually free to use?
Yes. Every calculator on this site is completely free, requires no sign-up, and does not store or transmit the numbers you enter.
How accurate are these calculators?
They use the same daily-periodic-rate mechanics most U.S. card issuers use, so results are typically within a few dollars of your real statement. See each calculator's FAQ for issuer-specific nuances.
Do you sell my data or require an account?
No. There is no account, no login, and no data collection tied to the calculators themselves. See our Privacy Policy for details on site analytics and advertising.