This is unfinished but it works for what it is.
Set the character level(s), choose the XP target (Easy, Medium, Hard, Deadly), then set the CR and number of each monster and it will calculate the total XP value, compare it to the set XP difficulty, and very simply tell you if the encounter is easier than the set difficulty (green), matches (yellow), or is harder (red).
Set the character level(s), choose the XP target (Easy, Medium, Hard, Deadly), then set the CR and number of each monster and it will calculate the total XP value, compare it to the set XP difficulty, and very simply tell you if the encounter is easier than the set difficulty (green), matches (yellow), or is harder (red).