Clash-of-clans – How is Clan Total Points calculated

• Scout out and allocate all the easy targets first - Make sure the poorly defended bases are allocated first and to clan members who will be taking part. These are the easy pickings and therefore you must be getting 3 stars on each. They can be allocated to the weaker members of the clan as long as you know they're going to turn up and do the job.

• Clan members should call targets on prep day and then only attack the targets they've called. - That way you have an idea of who's going to attack who and it gives you a chance to say if you think their choice is a bad one.

• Only allow clan members to attack realistic targets!

• Don't double up! - i.e. only attack targets that haven't already been allocated or attacked unless the first attack only scored 0-1 stars and you are positive they can achieve 3 stars.

• Kick those that don't comply to the house rules - If members repeatedly ignore these rules; or don't turn up; or have a poor defence when they could easily do better then kick them out of the clan. Remember if you've got 50 clan members and only 50% of those are active you'll be matched against another 50 member clan and the likely hood is they'll have a higher percentage of active players than you. But if you kick out your inactive members then your active population will increase and you'll still be matched against a clan of a similar size.

Other Options: You could also split attack day in to two. Only allowing the stronger members of your clan to attack on the second day and therefore ensuring the weaker members have chance to attack targets that are of equal ability. Then your stronger members can attack what's left which should be the stronger targets. Though this might not work as well if your clan is multi national due to time differences.

According to the Clash of Clans Wikia:

The clan ranking is based on the number of trophies of its members. This value is weighted according to the following table.

For reference, here is the weighting used:

1-10    50%     
11-20   25%  
21-30   12%   
31-40   10%  
41-50   3%   

So it is calculated by the amount of trophies in a weighted system instead of a simple total.