Future Jarhead: You’ll find that the counting formulas are a bit different across various applications, whether it be academy, civilian school (you’re working on Plan B, right?), ROTC and nominations. Sometimes word, sometimes character, sometimes spaces, sometimes not. Don’t waste anymore time worrying about that.
Follow the advice you got here. Write your essay in a doc program, such as MS Word. Get it to the required count, then copy-and-paste into the application itself. If the count remains correct, your done. If you’re over (it happens), then make minor adjustments directly on the application until you’ve met the requirement. Takes a bit of work, but c’est la vie. Done!