Here is a brief video that I made which outlines the steps to quickly find the reading level of any document using Microsoft Word.
Step 1: Select “File” then “Options”
Step 2: From the options menu select “Proofreading”
Step 3: Make sure that the readability box is checked and select “OK”
Step 4: Finally click on the book icon on the end of the page and fix all errors, if any. If there are no errors, details of the document will pop up showing the reading level, along with other data about the text.