Cornerstone guide · foundational · 8 min read
Daily periodic rates explained
Daily periodic rates translate an annual percentage into a per-day factor used inside many credit-card interest calculations.
Last reviewed 2026-07-25 · Sterling Editorial Team · Reviewed by Sterling Education Review
Key takeaways
- A daily periodic rate is usually APR divided by 365 or 360.
- It is a building block—not the whole interest story.
- Average daily balance methods and fees still matter.
When people say a card “charges interest every day,” they often mean the issuer uses a daily periodic rate as part of the math. That is useful shorthand—and incomplete.
Think of APR as the annual label and the daily periodic rate as one way issuers scale that label to daily balances. Your agreement tells you whether the divisor is 365 or 360 and how balances are selected.
Educational tip: if you only remember one habit, look at your statement’s APR section and the “How we calculate interest” language. That text beats any blog formula, including this one.
Sterling calculators that use daily rates will show assumptions so you can see what was simplified.
Related calculators
Sources and references
- Ask CFPB: How does my credit card company calculate interest? — Consumer Financial Protection Bureau
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