Are you looking to know the information about how many words in 4000 characters? then you have to check this tool called character count which has a very good information on the topic. As per character counter tool, there can be approximately 800 words if each word is framed using 5 characters.
While if the number of characters used to frame words is 10, then there will be around 400 words. Like this, it completely depends on the number of words you are going to use in your article while writing essays, assignments or any other content, but, there is nothing like these many words should be there for these many characters as per character counting tool.
So if you want to know more information on the same, you can visit the character count online tool where you can check both the number of characters and words of your text content. You only just need to copy paste your content in the tool box and it will show you number of characters including spaces or else without spaces, you can also know the keyword density of your words as well, this is especially very useful for the bloggers who want to get good optimization for their articles.