Easy way to counting word

Sometime I write article on different blogs and my employee give me payment by counting word but There was always a problem that I can find out how can I count my words in article. That was easy when I write only 50 or 100 words But when I write 2000+ word article then I was confused about counting word.  But one site helps me very much and I always use them for counting word . They are 99% accurate. I also think you also use it.