Look up your daily percentage rate for the loan, credit line or account. It might be listed as the daily periodic rate or the interest rate factor.
Multiply the daily percentage rate by 365 to convert it to an annual percentage rate.
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Multiply the result by 100 if the answer came out as a decimal and you want to express it as a percent. For example, if you found the daily rate is 0.000274, multiply by 365 to find that your annual rate is 0.1. Multiply by 100 to find that the annual percentage rate is 10 percent. Depending on the format of the initial daily rate, you might not need to do this step.