The elo we calculate is solely based on European cup performance from roughly last 30 years. Not only clubs but also players have an elo point. We have rich graphs, head-to-head comparisons, detailed statistics and so on. It is possible to go through the whole algorithm in an interactive page so you know why a club is at its current position. Find out your favorite club and favorite player's elo right now! We have ~2000 clubs and ~10000 players in our database already!
