Calculating credit card interest can seem a bit daunting at first. Typically, it's based on your annual percentage rate (APR) divided by 365 to find the daily rate, then multiplied by your average daily balance, and finally multiplied by the days in your billing period. It's useful to know this to manage costs effectively. Do you find managing credit card expenses challenging at times? I'd be happy to offer tips or strategies to help you minimize interest charges if you'd like!