How do I use 'percentage of max health?'

[HalosNTariff]

Hi, I'm making a map and in order for a hero to use their ultimate ability they have to fulfill a variety of criteria. One of these is that the hero must be on 30% of health or lower.

How would I go about doing this? My trigger so far runs when the unit is attacked, checks whether the unit is of the right type and then adds the ability. I need a condition which checks that the unit is on 30%, or lower, hp. Does anybody know how I would do this?

Thanks in advance.

 

[Dinowc]

real comparison - (current life of [unit]) / (max life of [unit]) less than or equal to 0.30

 

[HalosNTariff]

Thanks, much appreciated.