Credit card interest calculator with grace period & different interest rate calculation methods?
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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### Instruction:
Credit card interest calculator with grace period & different interest rate calculation methods?

### Response:
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.