|The term "Ability Cooldown Index" is only a popular term coined by fans and has not been confirmed by official sources.|
The ability cooldown index is a way of measuring how much time is left for a towers activated ability being available for use again after its effects have finished. It is a simple way of knowing how much cooldown time is left after an activated ability has completed its effects on the tower(s)/bloons during the game. A value of 1 means that after an abilities effects have finished, the ability can be used over again right away. A value of 0.50 would mean that the ability is halfway through cooldown once its impacts have ceased. A value of 0.25 shows that after an ability's actions have finished, its cooldown is one quarter of the way through and so on. The higher the cooldown index, the better.