Just bought some fabric from Wally world and wanted to make sure I understand the weight right to determine if I need double layer or single be fine.

Bought 4 yards. Weighed it on kitchen scale and it is 1lb 2oz or 18oz.
So 18/4 = 4.5 oz per yard.. Is that the correct way to figure that?

Seems heavy when compared to what I see most folks using. Weight of the hammock is not a problem since this is first one to make and will go in scout/car camping stuff.
Fabric is http://www.walmart.com/ip/Springs-Cr...slite/21853423

Thanks