The best time to upgrade to Flaming Arrows WITH BANKING is when holding:
5 Chariots by selling 1 Chariots
5 BPMs by selling 1 BPMs
The best time to upgrade to Flaming Arrows WITHOUT BANKING is when holding:
4 Chariots by directly buying the upgrade
4 BPMs by directly buying the upgrade

The best time to upgrade to Ballistas WITH BANKING is when holding:
5 Chariots by selling 1 Chariots
5 BPMs by selling 1 BPMs
The best time to upgrade to Ballistas WITHOUT BANKING is when holding:
4 Chariots by directly buying the upgrade
4 BPMs by directly buying the upgrade

The best time to upgrade to Battering Ram WITH BANKING is when holding:
5 Chariots by selling 1 Chariots
5 BPMs by selling 1 BPMs
The best time to upgrade to Battering Ram WITHOUT BANKING is when holding:
4 Chariots by directly buying the upgrade
4 BPMs by directly buying the upgrade

The best time to upgrade to Ladders WITH BANKING is when holding:
9 Chariots by selling 2 Chariots
5 BPMs by selling 1 BPMs
The best time to upgrade to Ladders WITHOUT BANKING is when holding:
4 Chariots by directly buying the upgrade
4 BPMs by directly buying the upgrade

The best time to upgrade to Trojan Horse WITH BANKING is when holding:
13 Chariots by selling 3 Chariots
5 BPMs by selling 1 BPMs
The best time to upgrade to Trojan Horse WITHOUT BANKING is when holding:
7 Chariots by directly buying the upgrade
4 BPMs by directly buying the upgrade

The best time to upgrade to Catapults WITH BANKING is when holding:
22 Chariots by selling 5 Chariots
9 BPMs by selling 2 BPMs
The best time to upgrade to Catapults WITHOUT BANKING is when holding:
10 Chariots by directly buying the upgrade
7 BPMs by directly buying the upgrade

The best time to upgrade to War Elephants WITH BANKING is when holding:
39 Chariots by selling 9 Chariots
18 BPMs by selling 4 BPMs
The best time to upgrade to War Elephants WITHOUT BANKING is when holding:
20 Chariots by directly buying the upgrade
10 BPMs by directly buying the upgrade

The best time to upgrade to Siege Towers WITH BANKING is when holding:
74 Chariots by selling 17 Chariots
35 BPMs by selling 8 BPMs
The best time to upgrade to Siege Towers WITHOUT BANKING is when holding:
40 Chariots by directly buying the upgrade
20 BPMs by directly buying the upgrade

The best time to upgrade to Trebuchets WITH BANKING is when holding:
143 Chariots by selling 33 Chariots
65 BPMs by selling 15 BPMs
The best time to upgrade to Trebuchets WITHOUT BANKING is when holding:
77 Chariots by directly buying the upgrade
37 BPMs by directly buying the upgrade

The best time to upgrade to Black Powder WITH BANKING is when holding:
286 Chariots by selling 66 Chariots
130 BPMs by selling 30 BPMs
The best time to upgrade to Black Powder WITHOUT BANKING is when holding:
154 Chariots by directly buying the upgrade
70 BPMs by directly buying the upgrade

The best time to upgrade to Sappers WITH BANKING is when holding:
568 Chariots by selling 131 Chariots
256 BPMs by selling 59 BPMs
The best time to upgrade to Sappers WITHOUT BANKING is when holding:
307 Chariots by directly buying the upgrade
137 BPMs by directly buying the upgrade

The best time to upgrade to Dynamite WITH BANKING is when holding:
1131 Chariots by selling 261 Chariots
512 BPMs by selling 118 BPMs
The best time to upgrade to Dynamite WITHOUT BANKING is when holding:
610 Chariots by directly buying the upgrade
274 BPMs by directly buying the upgrade

The best time to upgrade to Greek Fire WITH BANKING is when holding:
2258 Chariots by selling 521 Chariots
1019 BPMs by selling 235 BPMs
The best time to upgrade to Greek Fire WITHOUT BANKING is when holding:
1217 Chariots by directly buying the upgrade
547 BPMs by directly buying the upgrade

The best time to upgrade to Cannons WITH BANKING is when holding:
4511 Chariots by selling 1041 Chariots
2033 BPMs by selling 469 BPMs
The best time to upgrade to Cannons WITHOUT BANKING is when holding:
2430 Chariots by directly buying the upgrade
1094 BPMs by directly buying the upgrade