To apply the analytical bioclimatic design method introduced in Chapter 2 , a suitable methodological tool is needed that links climate characteristics to building performance, particularly in terms of occupants’ thermal comfort. Bioclimatic potential calculation, based on bioclimatic charts, is an example of such a tool. With the help of bioclimatic charts, basic climate data can be associated with appropriate bioclimatic potential categories and later correlated with bioclimatic design measures. The result is the evaluation of the effectiveness of each bioclimatic measure that provides indoor thermal comfort on a yearly, monthly, or daily basis. Hence, the calculation of bioclimatic potential serves as a starting point for early-stage climate-adapted building design. However, the results of the analysis are significantly conditioned by the inclusion of secondary climate-related parameters, such as solar radiation, evaporation potential, and diurnal air temperature variation. This chapter presents a historical background to the use of bioclimatic charts, as well as the basic constituents of Olgyay’s, Givoni’s, and Evans’s bioclimatic charts. To conclude, a detailed description of a three-step methodological approach of the BcChart tool for determining actionable bioclimatic potential results will be presented.