More than a decade ago I worked as a Staff Writer for the publishing division of a private school system, writing curriculum materials. I had to learn to write to specific grade levels, and target my content and style. I later took a technical writing course and wrote an entire manual on how to use the Flesch-Kincaid Readability Formula to determine the grade level of a particular piece of writing.
So what the heck does the Flesch-Kincaid test have to do with SEO? Quite a bit.
I recently wrote a series of articles on the GED exam (high school equivalency, for those not familiar with the term). Get a GED Online and Free GED Test are two examples. It dawned on me as I wrote the first article that my audience would likely have less than a 10th-grade reading level. So I aimed for 7th grade.
The articles do fairly well in getting page views. So I recently analyzed my top earning articles on all the different sites where I write - I chose the top 5. Guess what? The closer to 5/6/7th grade for readability, the better the article's performance for page views and for revenue (when I know the exact revenue for an article).
The New York Times and USA Today aim for 10th-grade reading level. Most newspapers aim for 9th grade. I've read that romance novels are aimed at a FIFTH grade reading level (though the content is not aimed at 10-11 year olds!). If you're writing SEO/CRO articles, keep your audience in mind.
And to test reading level, check out this free Flesch-Kincaid Readability Formula site, or just use the MS Word feature.
By the way: this post was written at an 11th-grade level.