I believe the price is per panel. Yes, you would need at least two. Considering the sheerness of the fabric, it might look more luxurious if you had 4 panels per window.

Thanks bbstx. I am looking for something sheer, almost not there. It's for a home office that I am trying to keep light and simple. I have blinds which I will pull at night and want something over them. I'm also looking at some cute dotted swiss curtains.

Here is a link that might be useful: dotted swiss curtains