Back of the Napkin AP per square feet?

[corey_costello]

Hey, 

Does anyone have a back of the napkin, APs per square feet that they use for r510s?

We've been tasked with figuring out X number of APs for a customer, and of course it's a "secure" place and they will not provide a floor plan. 

So, is there a 1 ap for X amount of square feet that I can use to get a base on?