You have to do the math yourself, for yourself!
.... because only YOU can measure the pain or pleasure that results from any action.
It is exactly wrong to do what the Benthamites tried to do and reduce the calculation purely to mathemetics.
However, so long as you realize that the mathematics is only an aid, and cannot be applied as the final factor, I would say that lining things up statistically does make some sense as a tool of analysis.
So I'd still maintain that in any difficult decision it probably does make sense to sit down and try to enumerate the options as a spreadsheet. If you don't, you're not making your best effort to think things though. But you have to remember that the assignment of units of pain and pleasure is entirely relative to you.
Therefore I would not say "don't even try to add them up because it can't be done."
i would say "plotting out the possibilities in detail is the only rational way to proceed, but you have to remember that there is no "necessity" in ethical decisionmaking. You can't treat your projection as applicable to anyone else or even to yourself at a later time. A moment by moment analysis is all that is possible,
A Draft Epicurean Pleasure Maximization Worksheet
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