1. Clan games count most. When registered clans meet on opposing teams, the clan whose team does better gains Clan ELO and the other clan loses some. Beating a stronger clan is worth more than beating a weaker one.
2. Team games count too. Your clan's results in its other team games move its rating as well. Winning often matters more than just playing a lot.
3. Medals add a bonus. Team speedrun medals and Daily Streak medals give your clan extra Clan ELO. In each speedrun category a clan holds at most one medal (from its fastest lineup), and every further medal adds a little less than the one before, so medals help but never outweigh clan-vs-clan results.
4. Every season starts fresh. Only games since the last reset count, and a clan that has not played yet slowly drops until its first game.

Every day the home page shows the best win streak today: the most clan games one clan won in a row that UTC day. When the day is over, the clan with that day's best streak wins a Daily Streak medal, which adds to its Clan ELO.

The exact weights and numbers behind Clan ELO are TeamStats.pro's own recipe. Keeping them private makes the ranking harder to farm: the way to climb is simply to beat other clans and win team games.