Credit Card Interest Calculator
See the daily and monthly interest accruing on your credit card balance.
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Inputs
$
%
Daily interest
$3.15
Cycle interest
$94.48
Annual interest
$1,149.50
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How it works
Daily periodic rate = APR ÷ 365. Multiply by your balance and the days in the cycle to estimate interest charged.
Frequently asked questions
How is credit-card interest calculated?
Issuers use average daily balance × daily periodic rate × days in cycle. Daily periodic rate = APR ÷ 365.
Why is it sometimes higher than I expect?
Cash advances and balance transfers often have their own APR and start accruing immediately with no grace period.
How do I avoid card interest entirely?
Pay the statement balance in full by the due date. No interest is charged on purchases when you do.
What's a grace period?
The interest-free window (typically 21–25 days) between statement close and due date — only available if you carried no balance.
Does interest compound?
Yes — most cards capitalize interest into the balance, so unpaid interest itself accrues interest.
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