Hello Gloryne,
Well, actually you can also use the equity calculation for calling calculation for example on the river. If you know what kind of hands the opponent may raise there for value. You know how much equity you need or other words how often you have to be ahead. Then you just put his range what you expect him to raise with and will get the understanding either you are ahead or do the Call profitable in long run.
Thanks also for the feedback, trying to give my best. 
Best Regards.