Hercules Post Stats

Hercules Post Stats adds a meta box to your post edit screen that shows you real time details about how many words you have written in the post, how many you wrote this session, how much time total you have spent on the post, how long you have spent this session, and approximately how long it would take the average reader to read the post.

Add this plugin by uploading the zip using the "Add Plugin" feature built into Wordpress. Otherwise manaully unzip the folder and upload the entire directory to your blog's plugins folder ( /wp-content/plugins/ ). Next you have to activate the plugin. Alternatively you can install it using the Wordpress plugin search from the plugins page in your Wordpress admin area.