Mortgage Insurance. PMI is an insurance policy for the lender in case you stop making your monthly payments. Depending on your LTV (loan to value) ratio and other factors, your PMI cost may vary. On average, PMI for a conventional home loan ranges from 0.58% to 1.86% of the original loan amount per year. Below is a guide on PMI, how much PMI is, and other facts you should know before paying PMI.