This site can sort out your Currency Conversion
It also gives historical graphs, but not trends
, and converts every other currency you can think of.
The rates are negotiable with your bank depending on the amount being exchanged. I have always found buying the destination currency before I leave gives the best rate, had a bad experience exchanging pounds in Brisbane, they really did not want them, whereas your High Street Bank in Blighty is only too pleased to get rid of Oz $'s.