There is no single answer to that. There are many countries and so many currencies in Europe so the value of any other currency would vary against them, and have different values in different countries.
However, currently (June 2011), $1 is equivalent €0.684 or £0.609
A US dollar is worth 0.9822561 of a dollar in Europe
Around 0.68 Euro
Jan 2010 : Most of Europe now uses Euro : $1 = €0.695. UK : $1 = £0.615.
1 U.S. Dollar = 0.765224 Euros
1 dollar = 1 dollar or 1 dollar= .75 euros
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