Dmg calculation mod

So I've been wargaming a bit in my mind before making moves in XCOM2 and I wanted to ask if there is such a mod which would either

Given an enemy position, calculate total average damage done to enemy by firing from specific skills.
For example, let's say I have 3 guys with 3-5 dmg and 70% accuracy. This mod could say that their combined damage is 4 * 0.7 * 3 which is roughly 8.4. So that would probably put an advent officer with 7 hp down.

I'm doing it in my head right now, but that seems to be not really efficient