Fd = 3.6 * Distance / MapSize As Sebastian pointed out in an earlier post, use the average of the two map dimensions for map size. The default map sizes are equal in both dimensions. (MapSize = 100 for a standard-sized map) With 1.21f: Nopt = OptimalCities * (1 + N/4) * DifficultyPercent / 100 + Nciv OptimalCities is a setting in the editor for each map size. I believe 32 is the default for huge maps. DifficultyPercent is also in the editor, under difficulty settings. It ranges from 100 (Chieftain) to 70 (deity). Nciv = 1 for commercial civs. Zero otherwise. N = Number of corruption-reducing buildings in that city (courthouse and police station). Add one for waste calculations for a city in WLTK.