The Flesch Reading Ease test rates text on a 100-point scale. The higher the score, the easier it is to understand the document. For most standard files, you want the score to be between 60 and 70. The formula for the Flesch Reading Ease score is:
206.835 – (1.015 x ASL) – (84.6 x ASW)
The images on the left are for quick conversion and remedy for any piece of writing that “fails” the Flesch test.
If you don’t want to do the math or just want another opinion, here is a free readability test tool.