Word Count when editing backstory

So on all sites there is a minimum Backstory length rule, which is a great rule but sometimes when you are still in the process of planning parts of the backstory you write a small bio about your character. My idea is to have a word count a little like on the homework section so you are able to see how many words you have written. 

I have thought about this for a while, I have always needed to either originally write it in a doc or copy and paste it in a word count to make sure my backstory is up to par with the rules, having it at the bottom when writing could make this a lot easier.