Provided is an apparatus and method for calculating a wind load. The apparatus for calculating a wind load includes an information collecting unit collecting heights of a plurality of points in a region, a frequency distribution calculating unit calculating a frequency distribution for the heights of the plurality of points, and a parameter calculating unit allocating ground surface roughness for ranks in the frequency distribution and calculating parameters for the region by applying weights on the basis of the frequency distribution to parameters set for each ground surface roughness for calculating the wind load.