APR stands for annual percentage rate, while EAR stands for effective percentage rate of active APR. APR is the simple interest rate per year, while EAR is the compound interest rate plus a fee calculated across a year.
APR is calculated as the rate for the payment period, multiplied by the number of payment periods in a year. The chief meaning of EAR may encompass variations in each given jurisdiction, depending on the type of fees that might be relevant, such as monthly service charges, participation fees, or originating loan fees.
APR is not as mathematically precise as an EAR. However, at the same percentage rate, APR gives marginally better returns than EAR with factors being constant.