This calculator will help you determine the force of wind on your structure, and whether or not it will withstand the wind loads in your area. To determine the force of wind on your structure, start by calculating the square footage of the sideview of your structure. For example, if your structure is solid, like the side of a structure, multiply the width X height to get the square footage. If you have a structure like an arbor, calculate each board like this... An 8' 2x6 has the square footage when it's on it's edge is 1.5" X 96" = 144 sq in = 1 sq ft per board. The same board on it's side is 5.5" X 96" = 528 sq in = 3.67 sq ft per board.
Wind Force / Sideload Calculator