I plan to update my bitcoin files this weekend and I will try to answer your question at least for me in more detail.
Don't know how accurate this calculation but its a rough start. I am mining about .001 bitcoin a week. .004 x 65,000 = $260. I pay $149 a mo for electricity.
So with the halving I will be about BE. So the halving is really not a killer at all. I have no clue how much of the bitcoin that I am paid comes from transaction fees.