How much does it cost to attend a conference, all in? If your boss is paying then you mightn't care. However, you need to have a figure in mind when you start writing grants because you need to budget it in. Want to go to one European and one international conference a year for three years? How much would that set you back?
I recently attended the German Conference on Cheminformatics in Goslar, and I determined that this time, at least, I would do my utmost (short of squabbling over the bill) to collect all relevant receipts as I had specific funding just for those costs.
Now, bearing in mind that Cork->Goslar is an indirect flight involving an overnight stay plus some train journeys here are the figures (rounded to the nearest 20 euro, E&OE):
So, in or around 1000 euro. It does add up, doesn't it? Going to the ACS I would guesstimate at around 2.5 times this. Anyone got a better estimate?