Figure the square footage of wall then subtract square footage of any doorways or windows.  Add 10% to final square footage to account for waste.  We always include a few extra boards at no cost to ensure you have enough product for your project.  It’s worth noting that our shiplap is ¾” thick, which means it is easier to install and if installed properly you will never have to worry about finding a stud to hang pictures or other décor.  Also, we will be happy to assist you in figuring the accurate square footage for your project.