as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
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credit card interest calculator with grace period & different interest rate calculation methods?
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if you want to ensure that you stop paying interest, the best thing to do is to not use the card for a full billing cycle.  calculating credit card interest with precision ahead of time is difficult, as how you use the card both in terms of how much and when is critical.
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