Your Clan's ranking can be viewed in the Rankings tab on the main menu panel. At present, you can sort the rankings by Kingdom or World. The available filters include: Wealth, Might, Valor Points gained, Conquest Points gained, and Crypts explored. The values in the ranking are calculated by adding up the numbers for individual players.
Rank points that are accumulated by a player before they join a Clan (with the exception of Might) are not added to the Clan ranking when the player joins a Clan. That is, only points earned by Clan members after they join a Clan count toward the Clan's ranking.