Does any know what exchange rates Google uses?
Welcome to WebmasterWorld, uefaeuro!
As HitProf says, it varies. I hope you'll find the answer you need in this past thread:
Choosing a currency
[webmasterworld.com...]
AWA
Because this is so granular a calculation, there is no advantage to bidding in one currency rather than another.
If you're looking for the cheapest prices only, bidding in the currency with the lowest minimum bid can make a difference. I have no experience with this yet though but I've seen several posts about it.
[google.com...]
I presume USD is the cheapest (0,05 USD) but I don't know for sure.
(With exceptions if you are from China or Poland - min. bid is USD 0,02?)
AWA, could you perhaps find out if they use the same sources for conversions as AdWords does?
[google.com...]
Here are some sample queries:
3.5 USD in GBP
currency of Brazil in Malaysian money
5 British pounds in South Korean money