APR is a measure that calculates what percentage of the premium a customer will be charged for paying the insurance monthly rather than all in one lump sum payment. It takes into account all charges from monthly payments over the course of the loan and any upfront fees. APR is most often expressed in terms of an interest rate (%). All credit lenders must tell the customer what their APR is, enabling the customer to compare charges across different credit options (e.g. credit cards, personal loans).