Writing Clarity Index Calculator

About This Tool (below)

Beta: Try the new clarity calculator here

Enter 180-200 words from an e-mail or report into this box, and click the button to see how clear you are being. If using an e-mail, ignore hello and goodbye lines (e.g. "Hi Christina," and "Bye for now, Britney")

Note: A more advanced version of this tool is available here.

About This Tool

The Clarity Index is a tool that was developed by the US Army to encourage personnel to be more clear with their writing.

In the business/academic world, the Clarity Index is an amazingly simple way of checking if you are making things too complicated, or if you are being too abrupt.

It does this by using a combination of the average words per sentence (aim for 15) and the percentage of your total text that are "long words" (aim for 15%).

The actual calculation is a bit complicated - and can take more than a minute to perform if you do it manually. This tool takes just seconds.

Copy a chunk of text - e.g. part of an e-mail or a report, between 180-200 words - and you will see the Clarity Index. Aim for 20-40, with 30 being ideal.