by Sam » Sat Jun 06, 2009 7:46 pm
there is noway to know the exact number of visitors from Alexa rank , but you can get an idea about the number of unique visitors a specific website is getting compared to another website
Notice that since Alexa is based on Alexa toolbar statistics , it can count only visitors who has Alexa toolbar in there browser , and since most people don't have this toolbar (only webmasters have it "mostly") the estimate number of visitors isn't necessarily right !!
so for example a website with alexa 100,000 may have less visitors than a website with alexa 105,000 !!!!