Do you do it in euros? or dollars or whatever your countries currency is? jdbri brought this up in another post and I am curious. And how do you estimate the exchange rate?
I did a budget for a friend in US dollars because she told me the max she could spend and I did it to see if I thought she could make the trip.
When I do a budget I use euros for Paris or other euro countries and pounds for the UK...but I've travelled enough that the real only variable for me is how cheap can I get the airfare... Or if I decide to go to an upscale hotel...which I have not done in a while. That would affect my budget. But basically I spend about the same each trip. I figure the euro with credit card/exchange rate fees as costing $1.50 and this past trip to London about the same. Of course last year a pound cost 2.03 US so I had to increase food costs etc.