Is it possible to track of battery consumption by all installed app on ios device?

Apps all do different things, to estimate it, you would have to do the calculations yourself. This isn't a set thing already.

I have an application on my Mac that lets me set up how much mAh charge an app runs through per minute and gives me an estimate. But still, I had to do the actual process of watching my battery go down while using it to get that number to begin with.