Clash-of-clans – How exactly does clan earn XP

• 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.

From what I have initially seen in my Clan's Current Wars you gain:

• +50 exp for winning the war
• +10 exp for 40% of stars gained
• +25 exp for 60% stars

and there seems to be a set amount of exp that's gained from attacks.

the Wikia however explains this better

Clan XP is a recent addition to the game; earning enough for the clan will level up the clan and unlock new things for the clan. It is earned through participation in Clan Wars. There are a few ways to earn Clan XP:

• Defeat enemy War Bases: this will earn a small amount of XP. Note that only the first successful attack gives XP, after that the base doesn't give any more XP.

  • Bases 1-5: 5 XP

  • Bases 6-15: 4 XP

  • Bases 16-25: 3 XP

  • Bases 26-50: 2 XP

• Accumulate enough Stars in the War: this earns more XP than simply defeating War Bases.

  • Getting 40% of all stars: +10 XP

  • Getting 60% of all stars: +25 XP

• Win the War: This earns 50 Clan XP for the clan, which is a lot.

The XP for the 40% and 60% thresholds stack so if you get 60% of the stars you gain +35 XP

the maximum amount of XP a clan can gain in the war is shown in both the War Stats page and the War Results page however given what the wikia says the absolute maximum amount of XP a clan can gain from any one war is as follows^*:

50     = Win
10     = Got 40% of stars
25     = Got 60% of stars
5 x 5  = first 5 bases in on the war map each giving 5 XP
10 x 4 = bases 6 - 15 on the war map each giving 4 XP
10 x 3 = bases 16 - 25 on the war map after each giving 3 XP
25 x 2 = the last 25 bases each giving 2 XP

                       25         40         30         50
Max = 50 + 25 + 10 + (5 x 5) + (10 x 4) + (10 x 3) + (25 x 2) 
Max = 50 + 25 + 10 + 25 + 40 + 30 + 50 

Max = 230 XP

^{*: value can be more during promotions such as the Double Clan XP}