A Standard APR is the annual percentage rate that is used to calculate the interest on an account. This is the interest rate for the entire year, which can be helpful in comparison shopping. However, there's also something called a "standard" APR, which is the go-to interest rate offered by most lenders. The go-to rate Standard APR can vary depending on the lender and the type of loan. The higher the Standard APR, the more expensive the loan or credit card will be.