Clan Score, also called Clan Points, is what determines the rank of your Clan. You can find your score on your Clan's profile, underneath the Clan badge. Beneath your Clan Score you will see all the Clan members, along with their Trophy counts. If a member has a Ranked rating that will be shown instead.
Top Royales Leaderboard
The Top Royales Leaderboard is accessible in Settings. The ‘Players’ tab shows the highest rated individual players, and the ‘Clans’ tab shows the highest rated Clans. Their Trophy counts and their Clan Rating are displayed. The Clan Rating is calculated based on the member’s Ranked ratings.
You can view both rating systems by tapping the Trophy or League icon in the top right of the ‘Clans’ tab.
Top Royale Clan Scoring
Clan Score and the Clan Rating are not the sum of all members’ Trophies or Ranked Score, but instead they are calculated by weight, according to the following rule:
For rank 1-10 within the Clan: 50% of the Trophies or Ranked Score are counted towards the Clan Score and Clan Rating respectively.
For rank 11-20: 25% of these are counted.
For rank 21-30: 12% of these are counted.
For rank 31-40: 10% of these are counted.
For rank 41-50: 3% of these are counted.
This means that the first 10 members' Trophies and Ranked Score have the most important impact on the overall Clan Score and Clan Rating. A Clan consisting of very strong top players, with weak players in the lower ranks, still has good chances of a strong overall score.